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Moments in Time

Identifieur interne : 000288 ( Pmc/Checkpoint ); précédent : 000287; suivant : 000289

Moments in Time

Auteurs : Marc Wittmann [Allemagne]

Source :

RBID : PMC:3196211

Abstract

It has been suggested that perception and action can be understood as evolving in temporal epochs or sequential processing units. Successive events are fused into units forming a unitary experience or “psychological present.” Studies have identified several temporal integration levels on different time scales which are fundamental for our understanding of behavior and subjective experience. In recent literature concerning the philosophy and neuroscience of consciousness these separate temporal processing levels are not always precisely distinguished. Therefore, empirical evidence from psychophysics and neuropsychology on these distinct temporal processing levels is presented and discussed within philosophical conceptualizations of time experience. On an elementary level, one can identify a functional moment, a basic temporal building block of perception in the range of milliseconds that defines simultaneity and succession. Below a certain threshold temporal order is not perceived, individual events are processed as co-temporal. On a second level, an experienced moment, which is based on temporal integration of up to a few seconds, has been reported in many qualitatively different experiments in perception and action. It has been suggested that this segmental processing mechanism creates temporal windows that provide a logistical basis for conscious representation and the experience of nowness. On a third level of integration, continuity of experience is enabled by working memory in the range of multiple seconds allowing the maintenance of cognitive operations and emotional feelings, leading to mental presence, a temporal window of an individual’s experienced presence.


Url:
DOI: 10.3389/fnint.2011.00066
PubMed: 22022310
PubMed Central: 3196211


Affiliations:

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PMC:3196211

Le document en format XML

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<p>It has been suggested that perception and action can be understood as evolving in temporal epochs or sequential processing units. Successive events are fused into units forming a unitary experience or “psychological present.” Studies have identified several temporal integration levels on different time scales which are fundamental for our understanding of behavior and subjective experience. In recent literature concerning the philosophy and neuroscience of consciousness these separate temporal processing levels are not always precisely distinguished. Therefore, empirical evidence from psychophysics and neuropsychology on these distinct temporal processing levels is presented and discussed within philosophical conceptualizations of time experience. On an elementary level, one can identify a
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</TEI>
<pmc article-type="review-article">
<pmc-dir>properties open_access</pmc-dir>
<front>
<journal-meta>
<journal-id journal-id-type="nlm-ta">Front Integr Neurosci</journal-id>
<journal-id journal-id-type="publisher-id">Front. Integr. Neurosci.</journal-id>
<journal-title-group>
<journal-title>Frontiers in Integrative Neuroscience</journal-title>
</journal-title-group>
<issn pub-type="epub">1662-5145</issn>
<publisher>
<publisher-name>Frontiers Research Foundation</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">22022310</article-id>
<article-id pub-id-type="pmc">3196211</article-id>
<article-id pub-id-type="doi">10.3389/fnint.2011.00066</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Neuroscience</subject>
<subj-group>
<subject>Review Article</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Moments in Time</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Wittmann</surname>
<given-names>Marc</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="author-notes" rid="fn001">*</xref>
</contrib>
</contrib-group>
<aff id="aff1">
<sup>1</sup>
<institution>Department of Empirical and Analytical Psychophysics, Institute for Frontier Areas in Psychology and Mental Health</institution>
<country>Freiburg, Germany</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>Edited by: Valerie Doyere, Centre National de la Recherche Scientifique, France</p>
</fn>
<fn fn-type="edited-by">
<p>Reviewed by: Valtteri Arstila, University of Turku, Finland; Bruno Mölder, University of Tartu, Estonia</p>
</fn>
<corresp id="fn001">*Correspondence: Marc Wittmann, Institute for Frontier Areas in Psychology and Mental Health, Wilhelmstr. 3a, 79098 Freiburg, Germany. e-mail:
<email>wittmann@igpp.de</email>
</corresp>
</author-notes>
<pub-date pub-type="epreprint">
<day>11</day>
<month>7</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>18</day>
<month>10</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="collection">
<year>2011</year>
</pub-date>
<volume>5</volume>
<elocation-id>66</elocation-id>
<history>
<date date-type="received">
<day>07</day>
<month>6</month>
<year>2011</year>
</date>
<date date-type="accepted">
<day>02</day>
<month>10</month>
<year>2011</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright © 2011 Wittmann.</copyright-statement>
<copyright-year>2011</copyright-year>
<license license-type="open-access" xlink:href="http://www.frontiersin.org/licenseagreement">
<license-p>This is an open-access article subject to a non-exclusive license between the authors and Frontiers Media SA, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and other Frontiers conditions are complied with.</license-p>
</license>
</permissions>
<abstract>
<p>It has been suggested that perception and action can be understood as evolving in temporal epochs or sequential processing units. Successive events are fused into units forming a unitary experience or “psychological present.” Studies have identified several temporal integration levels on different time scales which are fundamental for our understanding of behavior and subjective experience. In recent literature concerning the philosophy and neuroscience of consciousness these separate temporal processing levels are not always precisely distinguished. Therefore, empirical evidence from psychophysics and neuropsychology on these distinct temporal processing levels is presented and discussed within philosophical conceptualizations of time experience. On an elementary level, one can identify a
<italic>functional moment</italic>
, a basic temporal building block of perception in the range of milliseconds that defines simultaneity and succession. Below a certain threshold temporal order is not perceived, individual events are processed as co-temporal. On a second level, an
<italic>experienced moment</italic>
, which is based on temporal integration of up to a few seconds, has been reported in many qualitatively different experiments in perception and action. It has been suggested that this segmental processing mechanism creates temporal windows that provide a logistical basis for conscious representation and the experience of
<italic>nowness</italic>
. On a third level of integration, continuity of experience is enabled by working memory in the range of multiple seconds allowing the maintenance of cognitive operations and emotional feelings, leading to
<italic>mental presence</italic>
, a temporal window of an individual’s experienced presence.</p>
</abstract>
<kwd-group>
<kwd>temporal integration</kwd>
<kwd>time perception</kwd>
<kwd>the present</kwd>
<kwd>psychophysics</kwd>
</kwd-group>
<counts>
<fig-count count="0"></fig-count>
<table-count count="0"></table-count>
<equation-count count="0"></equation-count>
<ref-count count="115"></ref-count>
<page-count count="9"></page-count>
<word-count count="9173"></word-count>
</counts>
</article-meta>
</front>
<body>
<p>The contents of consciousness are phenomenally present – now. This temporal aspect of phenomenal consciousness – its
<italic>nowness</italic>
– is inherent in all our experiences: I see, hear, feel, and think at the present moment (Metzinger,
<xref ref-type="bibr" rid="B54">2004</xref>
; Droege,
<xref ref-type="bibr" rid="B14">2009</xref>
). What is experienced is experienced
<italic>now</italic>
. Conscious experience is not static and unchanging; the passage of time is often described by a stream or a flow. Phenomenological analysis has pointed to these two complementary (or seemingly paradoxical) aspects of experience: the feeling of a present moment and the passage of time (James,
<xref ref-type="bibr" rid="B35">1890</xref>
, chapter XIV; Husserl,
<xref ref-type="bibr" rid="B34">1928</xref>
). The unity of the present is related to our sense of
<italic>nowness</italic>
. The experience of the passage of time constitutes itself through an event that is first anticipated, then experienced and eventually remembered. Taken together, phenomenal consciousness consists of an island of presence in the continuous flow of time related to what is happening right now (Metzinger,
<xref ref-type="bibr" rid="B54">2004</xref>
).</p>
<p>A debate exists in the philosophical literature surrounding a presumed puzzle of how it is possible to have a temporal experience, to perceive duration, when our experiences are confined to the present moment. If perception is really limited to a present moment then we cannot perceive motion, change, the passage of time (Le Poidevin,
<xref ref-type="bibr" rid="B43">2007</xref>
). This puzzle is based on the assumption that an observer perceives static snapshots of the world that somehow have to be integrated to form unified experiences over time (Kelly,
<xref ref-type="bibr" rid="B37">2005</xref>
). A present moment, in this line of thought, is like a mathematical point on a continuum, an isolated and duration-less instant in time. Accordingly, distinct and duration-less present moments of experience have to be connected to create phenomenal continuity over time, this conception of time essentially being a cinematographic metaphor. An alternative account of how we perceive change and succession, the flow of time, is that our experiences actually possess inherent temporal properties, i.e., we experience whole intervals in time (Kiverstein,
<xref ref-type="bibr" rid="B40">2010</xref>
); succession, rhythmic grouping and motion can be directly perceived as constituents of present experience (Stern,
<xref ref-type="bibr" rid="B79">1897</xref>
). Our momentary experience is embedded in a temporal field reaching both into the past and into the future (Stern,
<xref ref-type="bibr" rid="B79">1897</xref>
; Lloyd,
<xref ref-type="bibr" rid="B47">2004</xref>
,
<xref ref-type="bibr" rid="B48">2011</xref>
). Present experience contains traces of what has just happened and what is anticipated, or in Husserl (
<xref ref-type="bibr" rid="B34">1928</xref>
) terms, the tripartite structure of present experience involves
<italic>retention</italic>
,
<italic>impression</italic>
, and
<italic>protention</italic>
. The perceived present represents its history and possible future, this tripartite structure being an implicit aspect of any conscious experience (Lloyd,
<xref ref-type="bibr" rid="B47">2004</xref>
,
<xref ref-type="bibr" rid="B48">2011</xref>
). According to this conception, our present experience is characterized as stretched across time. In different terms, the present moment – as the “specious present” – has duration (James,
<xref ref-type="bibr" rid="B35">1890</xref>
, chapter XIV). Various conceptualizations have been put forward concerning the experience of an extended present moment. The “retentionalist” view assumes that the contents of momentary experience, although the moment itself is without extension, represent temporally extended intervals; the “extensionalist” position assumes that experiences themselves are defined by temporally extended “chunks.” These models are not discussed here, but a thorough comparison of the intricate details can be found in Dainton (
<xref ref-type="bibr" rid="B11">2010</xref>
).</p>
<p>The philosophical debate concerning the present moment is mirrored by empirical research in psychology and the neurosciences on the issue of temporal integration of events that constitutes the “psychological present.” In fact, recent philosophical contributions refer to the neuroscientific literature of how the brain might integrate events over time; by interpreting empirical findings tentative estimates of characteristic times are provided that are supposed to underlie the experience of the present moment (Pockett,
<xref ref-type="bibr" rid="B63">2003</xref>
; Kelly,
<xref ref-type="bibr" rid="B37">2005</xref>
; Callender,
<xref ref-type="bibr" rid="B9">2008</xref>
; Droege,
<xref ref-type="bibr" rid="B14">2009</xref>
; Dainton,
<xref ref-type="bibr" rid="B11">2010</xref>
). The goal of this article is to provide a systematic overview of empirical findings in psychophysics and neuroscience pertaining to temporal integration processes. This article does not aim at contributing to the question concerning the legitimacy of merging phenomenology with neuroscience – bridging the subjective and the objective perspective of the world, essentially the neuro-phenomenological approach (Varela,
<xref ref-type="bibr" rid="B94">1999</xref>
; Thompson,
<xref ref-type="bibr" rid="B84">2007</xref>
). It may be read as presenting knowledge of empirically identified levels of temporal integration that could potentially be assigned to phenomenal experiences of the present moment. However, this is not a philosophical paper but a review of the empirical literature which can be seen as a complementary attempt (from the viewpoint of cognitive neuroscience and psychophysics) to summarize and structure the body of literature on temporal integration as potential correlates of the present moment.</p>
<p>In many independent conceptualizations, perception, cognition, and motor behavior are thought to happen in discrete windows or processing epochs (White,
<xref ref-type="bibr" rid="B101">1963</xref>
; Pöppel,
<xref ref-type="bibr" rid="B65">1970</xref>
,
<xref ref-type="bibr" rid="B68">1997</xref>
; Dehaene,
<xref ref-type="bibr" rid="B12">1993</xref>
; VanRullen and Koch,
<xref ref-type="bibr" rid="B93">2003</xref>
). Related specifically to the perception of time, these temporal units have been attributed to a physiological pacemaker or “internal clock” emitting regular pulses (Treisman,
<xref ref-type="bibr" rid="B85">1963</xref>
). However, it is important to note that the theoretical approach presented here is not primarily concerned with “psychological time” or “explicit judgment of duration.” Although empirical findings from research on time perception will be integrated as evidence pertaining to the presented conceptions, the discussed levels of temporal integration are thought to underlie mental processing in general as particularly related to the “present moment.” According to these conceptions, successive events are fused into functional units forming
<italic>snapshots of experience</italic>
or
<italic>psychological presents</italic>
(Ruhnau,
<xref ref-type="bibr" rid="B75">1995</xref>
; van Wassenhove,
<xref ref-type="bibr" rid="B90">2009</xref>
). Essentially, temporal experience has no “null point,” which would correspond to zero physical duration (Wackermann,
<xref ref-type="bibr" rid="B97">2007</xref>
). Psychophysical investigations reveal thresholds and minimal durations necessary for certain temporal experiences. Departing from the taxonomy by Pöppel (
<xref ref-type="bibr" rid="B68">1997</xref>
) three different temporal processing levels will be discerned which are assumed to temporally integrate events on different time scales. Each level is discussed to be related to different aspects of the conceptions of a present moment and experienced presence.</p>
<sec sec-type="">
<title>The Functional Moment</title>
<p>The fundamental notion that perception and action are based on discontinuous processing of information in discrete units is characterized by the idea of co-temporality, i.e., events within such a time unit have no before–after relation (Ruhnau,
<xref ref-type="bibr" rid="B75">1995</xref>
). This is demonstrated by the analysis of psychophysical experiments assessing the perception of successiveness of two events. The sensory systems have different temporal resolutions for the detection of successiveness or non-simultaneity. The highest temporal resolution (the lowest threshold of detection) is observed in the auditory system, where two short acoustic stimuli which are only 2–3 ms apart are detected as non-simultaneous. The visual and the tactile system have a lower temporal resolution with respect to non-simultaneity with thresholds of some tens of milliseconds; inter-modal stimulation leads to the highest thresholds (Exner,
<xref ref-type="bibr" rid="B20">1875</xref>
; Lackner and Teuber,
<xref ref-type="bibr" rid="B42">1973</xref>
; Kirman,
<xref ref-type="bibr" rid="B38">1974</xref>
; Lotze et al.,
<xref ref-type="bibr" rid="B50">1999</xref>
). The detection of non-simultaneity of two short events, however, is not perceptually sufficient to indicate their temporal order. Although we may be aware that two events did not occur simultaneously, we can still be unable to tell which one of the two stimuli occurred first. The temporal order threshold, which defines the inter-stimulus interval between two events at which an observer can reliably indicate the temporal order is more comparable across senses and lies roughly at 20–60 ms, to some extent depending on physical stimulus properties (Hirsh and Sherrick,
<xref ref-type="bibr" rid="B33">1961</xref>
; Fink et al.,
<xref ref-type="bibr" rid="B21">2006a</xref>
; Miyazaki et al.,
<xref ref-type="bibr" rid="B56">2006</xref>
; Szymaszek et al.,
<xref ref-type="bibr" rid="B83">2009</xref>
). A similar minimal threshold of at least 20 ms is necessary for the identification of temporal order of onset between two longer complex acoustic events, adding to the notion that the temporal-order threshold marks a fundamental limit of temporal perception (Pastore and Farrington,
<xref ref-type="bibr" rid="B59">1996</xref>
).</p>
<p>Temporal order is a primary experiential temporal datum, connecting subjective experience with the objective order of events (Wackermann,
<xref ref-type="bibr" rid="B97">2007</xref>
,
<xref ref-type="bibr" rid="B98">2008</xref>
). Ultimately, the notion of time is based on the elementary temporal relation of two events,
<italic>A</italic>
and
<italic>B</italic>
, which can be judged in their temporal order, “
<italic>A</italic>
occurs before
<italic>B</italic>
” or “
<italic>A</italic>
occurs after
<italic>B</italic>
.” For example, music and spoken language are only meaningful if the correct temporal order of individual components is detected. The inversion of temporal order would lead to a different and new experience. For this reason, experienced temporal order as retrieved from memory appears in the same temporal order as when it was perceived (Mach,
<xref ref-type="bibr" rid="B51">1911</xref>
). Below the experimentally assessed threshold of some tens of milliseconds the temporal order of events cannot be reliably detected. Elements that are perceived as non-simultaneous can be inter-changed without a noticeable effect for an observer. This has, for example, lead to the idea that temporal information within a segment of the speech signal not exceeding the
<italic>functional moment</italic>
might not be relevant for decoding spoken language (Kiss et al.,
<xref ref-type="bibr" rid="B39">2008</xref>
). The relation between the perception of speech and the perception of temporal order has repeatedly been demonstrated in studies with neurological patients suffering from aphasia and with adolescents who have language-learning impairments (Wittmann and Fink,
<xref ref-type="bibr" rid="B104">2004</xref>
). These individuals have difficulties in discriminating consonants, which requires the ability to detect temporal order of speech signal components, because they have increased auditory temporal order thresholds (Wittmann et al.,
<xref ref-type="bibr" rid="B103">2004</xref>
; Fink et al.,
<xref ref-type="bibr" rid="B22">2006b</xref>
).</p>
<p>Based on the empirical findings of discrete processing in perception and action it has therefore been suggested that the brain creates a-temporal system states during which incoming information is treated as co-temporal, and which are on the one hand responsible for binding intra- and inter-modal information and on the other hand create the experience of temporal order (Pöppel et al.,
<xref ref-type="bibr" rid="B70">1990</xref>
; Ruhnau,
<xref ref-type="bibr" rid="B75">1995</xref>
; Pöppel,
<xref ref-type="bibr" rid="B68">1997</xref>
). The idea that perceptual information as well as motor commands might be processed in discrete packets, at regular moments in time (Dehaene,
<xref ref-type="bibr" rid="B12">1993</xref>
; VanRullen and Koch,
<xref ref-type="bibr" rid="B93">2003</xref>
; van Wassenhove,
<xref ref-type="bibr" rid="B90">2009</xref>
), is in accordance with the conception of a
<italic>functional moment</italic>
, a snapshot of perception. Findings of several independent empirical approaches in neuroscience have lead to the suggestion that temporal building blocks in sensory and cognitive processing exist – responsible for creating discrete functional units in time as well as binding spatial features into perceptual wholes. These temporal units have been related to rhythmic brain activity of thalamo-cortical loops, the “gamma” band with a frequency of around 40 Hz (Joliot et al.,
<xref ref-type="bibr" rid="B36">1994</xref>
; Basar-Eroglu et al.,
<xref ref-type="bibr" rid="B7">1996</xref>
; Fries et al.,
<xref ref-type="bibr" rid="B26">2007</xref>
; Ehm et al.,
<xref ref-type="bibr" rid="B17">2011</xref>
). However, periodicities in the alpha band (around 10 Hz) as well as the theta band (4–8 Hz), and potentially related to functional integration on a time scale of 100 ms and above (see below), may additionally contribute to temporal integration phenomena (VanRullen and Koch,
<xref ref-type="bibr" rid="B93">2003</xref>
; van Wassenhove,
<xref ref-type="bibr" rid="B90">2009</xref>
).</p>
<p>It is important to note that basic temporal integration mechanisms uniting disparate events into perceptual segments have been identified on different time scales and also in more complex inter-sensory perceptual tasks. For example, a time frame of about 200 ms determines the integration of auditory–visual input in speech processing when probing for the McGurk effect – an illusory fusion percept created when lip movements are incongruent to heard syllables (van Wassenhove et al.,
<xref ref-type="bibr" rid="B92">2007</xref>
). The fusion percept was reported if the onset of lip movement and syllable did not exceed this time lag. Temporal integration in a time frame of around 250 ms was reported in sensory–motor processing distinguishing maximum tapping speed from a personal, controlled motor speed (Peters,
<xref ref-type="bibr" rid="B61">1989</xref>
; Wittmann et al.,
<xref ref-type="bibr" rid="B109">2001</xref>
). With repetitive finger movements such as with maximum tapping speed, when inter-tap intervals are around 150 ms, movements are too fast to be represented as individual button presses within an ordered sequence. Only when the movement slows down and inter-tap intervals exceed at least 250 ms individuated button presses are experienced as following each other. Stimulus durations of 200–300 ms (and minimum inter-onset intervals) are a necessary prerequisite for the establishment of temporal order representation for the detection of the correct sequence of four acoustic or visual events (Warren and Obusek,
<xref ref-type="bibr" rid="B100">1972</xref>
; Ulbrich et al.,
<xref ref-type="bibr" rid="B88">2009</xref>
). When stimuli are shorter, or the inter-onset between stimuli is smaller, subjects cannot reliably report the temporal order of the presented sequence. An interpretation of these finding is that if two or more stimulus onsets fall within one window of temporal integration then temporal order cannot be experienced as the onsets are treated as co-temporal.</p>
<p>Regarding this approximate time range, it has been proposed that anterior insular cortex function may provide the continuity of subjective awareness by temporally integrating a series of elementary building blocks – successive moments of self-realization informed by the interoceptive system (Craig,
<xref ref-type="bibr" rid="B10">2009</xref>
). The continuous processing from moment to moment would advance with a frame rate of about 8 Hz, these temporal building blocks of perception lying in the range of 125 ms (Picard and Craig,
<xref ref-type="bibr" rid="B62">2009</xref>
). Neural microstates with average duration of 125 ms as derived from electrophysiological recordings have been discussed as potential “atoms of thought,” constituting critical time windows within which neural events are functionally integrated (Lehmann et al.,
<xref ref-type="bibr" rid="B44">1998</xref>
). In combining the two kinds of
<italic>functional moments</italic>
presented here, endogenous cortical rhythms in the gamma and theta range involved in speech perception and production have been related to corresponding left- and right-hemispheric neural activation. Speech would be processed by the left auditory cortex, integrating the signal into 20–60 ms segments which would correspond to phoneme length; at the same time speech would be processed in the right auditory cortex, integrating the signal into segments of 100–300 ms corresponding to syllabic analyzes (Poeppel,
<xref ref-type="bibr" rid="B64">2003</xref>
; Giraud et al.,
<xref ref-type="bibr" rid="B30">2007</xref>
). In the context of findings of various temporal integration phenomena it has moreover been proposed that mental processing is organized in multiple ranges of discrete periods which are all multiples of an absolutely smallest quantal period estimated to lie at approximately 4.5 ms (Geissler and Kompass,
<xref ref-type="bibr" rid="B28">2003</xref>
).</p>
<p>It has to be noted that research has identified further integration phenomena, all being on comparable time scales (Fraisse,
<xref ref-type="bibr" rid="B24">1984</xref>
). For example, a temporal integration window of 100–150 ms duration has been suggested to operate for perceptual grouping mechanisms of target and distractor tones in sensori-motor processing (Repp,
<xref ref-type="bibr" rid="B72">2004</xref>
). Using the paradigm of mismatch negativity of magnetic brain responses a window of integration of 160–170 ms was estimated to bind successive auditory input into an auditory percept (Yabe et al.,
<xref ref-type="bibr" rid="B110">1998</xref>
). Further integration levels below 1 s as related to the processing of static stimuli as well as associated with motion perception are not presented, but see Fraisse (
<xref ref-type="bibr" rid="B24">1984</xref>
) and Dainton (
<xref ref-type="bibr" rid="B11">2010</xref>
). Potentially, many other kinds of basic
<italic>functional moments</italic>
may exist.
<xref ref-type="fn" rid="fn1">
<sup>1</sup>
</xref>
What these divergent findings have in common is that on a temporally fine grained level in the range of tens of milliseconds as well as of hundreds of milliseconds temporal integration phenomena occur that are the basis for the experience of temporal unity of events (below the threshold) and of succession and temporal order (above the threshold). Below the reported thresholds of around 30 ms (when two short events are presented) or of thresholds ranging between 100 and 300 ms (when a stream of events is presented) temporal integration provides
<italic>functional moments</italic>
of experienced co-temporality. One could argue that these
<italic>functional moments</italic>
, within which events are fused together, are not experienced as having duration. Although the sensation of non-simultaneity implies two temporally separated events, one could nevertheless say that the experience of duration necessitates a clearly demarcating onset
<italic>A</italic>
and offset
<italic>B</italic>
defining an interval (with the inherent temporal order
<italic>A</italic>
before
<italic>B</italic>
). In this sense one can state that below the temporal order threshold, when two events have no clear temporal relation, subjective duration between the two stimuli is not experienced; the
<italic>functional moment</italic>
has no perceivable duration.</p>
</sec>
<sec sec-type="">
<title>The Experienced Moment</title>
<p>Despite the possibly discrete nature of underlying processes in perception and cognition, our phenomenal experience is nevertheless characterized as evolving continuously (VanRullen and Koch,
<xref ref-type="bibr" rid="B93">2003</xref>
). Only in rare neurological disorders or under the influence of pharmacological agents such as LSD individuals occasionally report of perceiving a series of discrete stationary images (Dubois and VanRullen,
<xref ref-type="bibr" rid="B15">2011</xref>
). However, we typically do not perceive static snapshots of the world but perceived events are embedded in an ongoing stream of experience. Music and language are only conceivable as consisting of extended moments, melodies, and phrases, which inter-connect individual musical and linguistic elements (Wittmann and Pöppel,
<xref ref-type="bibr" rid="B107">2000</xref>
). Even when we focus on an individual note in a musical piece or a word in a spoken sentence, these acoustic events can only be understood in its temporal relation to the preceding and the following musical or language structure. It is impossible to ignore the temporal context of what we perceive. Lloyd (
<xref ref-type="bibr" rid="B47">2004</xref>
,
<xref ref-type="bibr" rid="B48">2011</xref>
) has an intuitive example for temporality in music: when we hear Paul McCartney land on “Jude,” the “Hey” is still somehow present although no longer sensed (Husserl’s
<italic>retention</italic>
). A listener familiar with the
<italic>Beatles</italic>
, when she hears the “Hey” cannot help but already hear the “Jude.” The “Jude” is somehow present but it is actually only anticipated (Husserl’s
<italic>protention</italic>
). In phenomenological terms, what we perceive at present is strongly intertwined with what has just happened and what is about to happen (Lloyd,
<xref ref-type="bibr" rid="B47">2004</xref>
,
<xref ref-type="bibr" rid="B48">2011</xref>
; Kiverstein,
<xref ref-type="bibr" rid="B40">2010</xref>
).</p>
<p>When listening to a metronome at moderate speed, we do not hear a train of individual beats, but automatically form perceptual gestalts as an accent is perceived on every
<italic>n</italic>
th beat (1–2, 1–2, or 1–2–3, 1–2–3). These temporal units are mental constructs – physically speaking, they do not exist (Pöppel,
<xref ref-type="bibr" rid="B69">2009</xref>
). If the metronome is too fast, the inter-beat intervals are very short, a fast train of beats is perceived that cannot be experienced as containing temporally separated events with an ordered temporal structure. Subjective accentuation is not possible. If on the other hand the metronome is too slow, inter-beat intervals are too long, only individual beats which are not related to each other are perceived (1–1–1 etc.). This lower and upper range of the metronome speed at which accentuated temporal structures can be heard defines the temporal limits of perceptual grouping on this time scale. Empirical evidence suggests that these mental units comprising several individual beats have a lower limit of around 250 ms and an upper limit of approximately 2 s (Szelag et al.,
<xref ref-type="bibr" rid="B82">1996</xref>
; von Steinbüchel et al.,
<xref ref-type="bibr" rid="B95">1999</xref>
; London,
<xref ref-type="bibr" rid="B49">2002</xref>
). Further empirical observations revealed through a systematic variation of duration indicate that empty intervals marked by two acoustic events larger than 150–250 ms and shorter than 2 s are perceived as qualitatively different than intervals beyond these temporal boundaries (Benussi,
<xref ref-type="bibr" rid="B8">1913</xref>
; Nakajima et al.,
<xref ref-type="bibr" rid="B57">1980</xref>
). For example, two sound bursts separated by an interval below 150 ms were perceived as one double-peaked sound; between 150 ms and 2 s the two sound bursts were clearly separated from each other but subjects still felt a relation between them and they tried to automatically synchronize their body movements to the stimulus pair; with intervals larger than 2 s subjects reported that the two sounds were difficult to relate to each other and synchronization of body movements was not attempted (Nakajima et al.,
<xref ref-type="bibr" rid="B57">1980</xref>
). Whereas findings of qualitative as well as quantitative differences between intervals below and above 2 s are predominantly found by presenting empty intervals that are marked by two sounds (for a psychophysical study see Getty,
<xref ref-type="bibr" rid="B29">1975</xref>
), also regarding filled intervals it has been shown that duration up to 2–3 s is differently processed than duration exceeding 3 s (Ulbrich et al.,
<xref ref-type="bibr" rid="B87">2007</xref>
). However, results are not as clear cut as with empty intervals and “break points” are not always found (Noulhiane et al.,
<xref ref-type="bibr" rid="B58">2008</xref>
; Lewis and Miall,
<xref ref-type="bibr" rid="B46">2009</xref>
). Temporal segmentation has been reported in further investigations in sensory–motor control. Subjects can synchronize their motor actions to a sequence of presented tones with inter-stimulus intervals of above 250 ms (Peters,
<xref ref-type="bibr" rid="B61">1989</xref>
). However, this synchronization ability can only be maintained when inter-tone intervals do not exceed durations of about 2–3 s. With longer intervals precise anticipation of tones – effortless timing of behavior – breaks down (Mates et al.,
<xref ref-type="bibr" rid="B52">1994</xref>
). In a further analysis of this type of timing behavior, time ranges between 0.45 and 1.5 s seemed to be processed automatically, i.e., not strongly affected by secondary task fulfillment, whereas concomitant processing of a secondary task affected intervals in the range between 1.8 and 3.6 s (Miyake et al.,
<xref ref-type="bibr" rid="B55">2004</xref>
).</p>
<p>Also the phenomenon of perceptual bi-stability suggests itself for studying temporal constraints of conscious experience as one can easily tap into the subjective percepts (Leopold et al.,
<xref ref-type="bibr" rid="B45">2002</xref>
; van Ee,
<xref ref-type="bibr" rid="B89">2005</xref>
). The temporal analysis of bi-stable perception has been suggested as primary experimental approach for the understanding of the dynamics of mental states (Atmanspacher and Filk,
<xref ref-type="bibr" rid="B2">2010</xref>
). In essence, an ongoing competition between the neural representations of the two aspects of an ambiguous figure, such as the Necker cube, has to be resolved leading to the experience of one of the two perspectives at a given point in time. During continuous presentation, one aspect lasts on average for around 3 s before a switch in perspectives occurs, with some inter-individual variability and variance attributable to stimulus characteristics of the particular ambiguous figure (Gómez et al.,
<xref ref-type="bibr" rid="B32">1995</xref>
; von Steinbüchel et al.,
<xref ref-type="bibr" rid="B95">1999</xref>
; Meng and Tong,
<xref ref-type="bibr" rid="B53">2004</xref>
; Kornmeier et al.,
<xref ref-type="bibr" rid="B41">2007</xref>
). Given its temporal dynamics, the spontaneous switching rate has been discussed as stemming from the discussed temporal segmentation mechanism related to the subjective present (Varela,
<xref ref-type="bibr" rid="B94">1999</xref>
; Franck and Atmanspacher,
<xref ref-type="bibr" rid="B25">2009</xref>
; Pöppel,
<xref ref-type="bibr" rid="B69">2009</xref>
).</p>
<p>The
<italic>experienced moment</italic>
can be related to more elementary units of perception. For example, it has been proposed that the temporal integration mechanism of around 3 s, evoking our feeling of
<italic>nowness</italic>
, integrates successive processing units of around 30 ms,
<italic>functional moments</italic>
(Pöppel,
<xref ref-type="bibr" rid="B68">1997</xref>
,
<xref ref-type="bibr" rid="B69">2009</xref>
; Szelag et al.,
<xref ref-type="bibr" rid="B81">2004</xref>
). In another line of research that treats bi-stable perception as evolving from unstable two-state systems it was proposed that different mental processing stages have temporal properties matching the found temporal integration levels of 30, 300, and 3 s (Atmanspacher et al.,
<xref ref-type="bibr" rid="B3">2004</xref>
; Atmanspacher and Filk,
<xref ref-type="bibr" rid="B2">2010</xref>
). In combining the empirical findings, temporal integration of a few seconds has been suggested to provide the logistical basis for the subjective present (Pöppel,
<xref ref-type="bibr" rid="B66">1978</xref>
,
<xref ref-type="bibr" rid="B69">2009</xref>
; Fraisse,
<xref ref-type="bibr" rid="B24">1984</xref>
; Szelag et al.,
<xref ref-type="bibr" rid="B81">2004</xref>
). Whereas the duration of the
<italic>functional moment</italic>
is not perceived, an
<italic>experienced moment</italic>
relates to the experience of an extended now. According to this conception, the
<italic>experienced moment</italic>
has duration.</p>
</sec>
<sec sec-type="">
<title>Mental Presence</title>
<p>A temporal interval with duration exceeding about 3 s is experienced as being qualitatively different than shorter duration. When two events are separated by an interval of, say, 6 s, the experience of “emptiness” evolves, events are not bound together and the length of the interval separating the two becomes the focus of attention (Wackermann,
<xref ref-type="bibr" rid="B97">2007</xref>
). A pause in a conversation, if it reaches 6 s, might be felt as disturbingly long. In that sense, duration longer than 3 s leads to the predominant experience of an extended temporal interval. On the other side of the spectrum, what is the maximum time interval an observer can directly experience? It is well possible to judge the duration of 1 h, i.e., pressing a button every time one thinks that an hour has passed (Aschoff,
<xref ref-type="bibr" rid="B1">1998</xref>
). However, it is impossible to maintain a 1-h time interval continuously in the focus of awareness (Wackermann,
<xref ref-type="bibr" rid="B97">2007</xref>
). During such a period of 1 h a multitude of experiences accumulates that later can be retrieved from memory forming temporal cues that can be used to judge duration retrospectively (Zakay and Block,
<xref ref-type="bibr" rid="B112">1997</xref>
). But then the question remains what the upper limit of integration in prospective time perception might be, that is, of the perception of duration as presently and continuously experienced? More generally formulated and more importantly, what are the temporal boundaries of perception that allow us to hold events in present experience, in
<italic>mental presence</italic>
? Whereas the
<italic>experienced moment</italic>
forms an elementary unit, a temporally unified percept,
<italic>mental presence</italic>
involves the experience of a perceiving and feeling agent (“my self”) within a window of extended presence, a phenomenon that is based on working memory function. “Working memory provides a temporal bridge between events – both those that are internally generated and environmentally presented – thereby conferring a sense of unity and continuity to conscious experience” (Goldman-Rakic,
<xref ref-type="bibr" rid="B31">1997</xref>
). An
<italic>experienced moment</italic>
happens
<italic>now</italic>
, for a short but extended moment.
<italic>Mental presence</italic>
encloses a sequence of such moments for the representation of a unified experience of presence.</p>
<p>Reports from neurological case studies with individuals who suffer from anterograde amnesia after bilateral damage to the hippocampus indicate that these patients live within a moving temporal window of presence that does not reach beyond their short-term or working memory span, incapable of storing incidents into episodic long-term memory (Scoville and Milner,
<xref ref-type="bibr" rid="B77">1957</xref>
). These patients can hold information for a limited time in memory, they perform short tasks accurately and seemingly behave normal; but already after a few minutes they can not recall what has just happened (for a striking description of a patient with anterograde amnesia, see Sacks,
<xref ref-type="bibr" rid="B76">1986</xref>
). Due to their neurological impairment, patients with anterograde amnesia can act adequately within the temporal constraints of their functioning working memory, which accordingly must be a temporal constraint for
<italic>mental presence</italic>
, the continuous awareness of oneself as presently perceiving and acting within an environment. These clinical cases emphasize the functioning of short-term memory in healthy humans and how it can be interpreted as forming temporal boundaries of present awareness.</p>
<p>Experimental investigations of short-term memory show how the number of correct recalls of presented syllables decreases with increasing interval length between stimulus presentation and recall – in the range of multiple seconds – if the rehearsal of syllables is prevented (Peterson and Peterson,
<xref ref-type="bibr" rid="B60">1959</xref>
; Baddeley,
<xref ref-type="bibr" rid="B5">1990</xref>
). The capacity of short-term retention is defined as gradual loss of memorized elements as time passes. The typical retention functions described by logarithmic and exponential fits decrease rapidly at first and then levels out on a plateau (Rubin and Wenzel,
<xref ref-type="bibr" rid="B74">1996</xref>
). One could state that the time frame provided by short-term memory (related, working memory) creates a temporal horizon of experience which in humans contains descriptive–narrative elements created by our capacity for language (Varela,
<xref ref-type="bibr" rid="B94">1999</xref>
). Within this temporal horizon
<italic>mental presence</italic>
unfolds integrating mental processes and enabling conscious experience of a narrative self that has personal identity and continuity over time (Gallagher,
<xref ref-type="bibr" rid="B27">2000</xref>
).
<italic>Mental presence</italic>
is bound to the ability of maintaining mental representations in an active state for a certain period of time. It depends on the integration of multiple mental operations that lead to intentional behavior – created by ongoing activity of a global workspace, integrating activity from multiple distributed and specialized brain areas (Baars,
<xref ref-type="bibr" rid="B4">1988</xref>
; Dehaene and Naccache,
<xref ref-type="bibr" rid="B13">2001</xref>
). Essentially, it is working memory, a system of limited attentional capacity, supplemented by visuospatial, episodic, and phonologic storage systems, which holds information for temporal storage and manipulation (Baddeley,
<xref ref-type="bibr" rid="B6">2003</xref>
).</p>
<p>In duration reproduction tasks, individuals have to reproduce temporal intervals by pressing a key to indicate that a second comparison stimulus has reached the duration of a previously presented stimulus. The mean of reproduced intervals is accurate for shorter intervals of up to 3 s but with increasing interval lengths are progressively under-reproduced relative to physical time (Eisler and Eisler,
<xref ref-type="bibr" rid="B18">1992</xref>
; Wackermann,
<xref ref-type="bibr" rid="B96">2005</xref>
; Ulbrich et al.,
<xref ref-type="bibr" rid="B87">2007</xref>
; Wittmann et al.,
<xref ref-type="bibr" rid="B108">2010</xref>
). The negative curvature of the duration reproduction function results in an asymptotic upper limit of duration accessible to experience, i.e., a temporal horizon of experienced time in the range of roughly 10
<sup>2</sup>
 s (Wackermann,
<xref ref-type="bibr" rid="B97">2007</xref>
). Note, that the negative curvature in duration reproduction performance is found in those studies where subjects are instructed or discouraged from counting (Rattat and Droit-Volet,
<xref ref-type="bibr" rid="B71">2011</xref>
). Without chronometric counting, the immediate experience of duration is limited by an ultimate temporal horizon of reproducibility due to memory-loss of duration representation over time; temporal resolution of duration blurs with increasing interval length (Wackermann,
<xref ref-type="bibr" rid="B97">2007</xref>
,
<xref ref-type="bibr" rid="B98">2008</xref>
).
<xref ref-type="fn" rid="fn2">
<sup>2</sup>
</xref>
It is tempting to suggest that a healthy individual’s short-term memory span is related to the upper limit of prospective time perception; the limits of temporal experience, of perceiving duration continuously, would thereafter rely on the basic temporal properties of working memory. In fact, decay of memory traces has been discussed to underlie the experience of duration. Since memory strength decreases with time, memory trace decay could actually function as a “clock” (Staddon,
<xref ref-type="bibr" rid="B78">2005</xref>
). That way, the same processes would underlie forgetting as well as time perception. This memory-loss component is an intrinsic feature of the “dual klepsydra model” (Wackermann and Ehm,
<xref ref-type="bibr" rid="B99">2006</xref>
; Wackermann,
<xref ref-type="bibr" rid="B98">2008</xref>
), where subjective duration is represented by the state of a lossy accumulator. This accumulator receives inflow for the build-up of duration presentation of a stimulus that has to be judged. A simultaneous outflow reflects the loss of representation leading to typical responses in psychophysical tasks, indicative of “subjective shortening” of stored duration over time.</p>
<p>There is no absolute, fixed temporal boundary of
<italic>mental presence</italic>
. The reports of a limiting value in the order of magnitude of 10
<sup>2</sup>
 s in the ability to reproduce duration indicate that the representation of increasing duration becomes more and more compressed. The duration reproduction curve becomes increasingly flatter, i.e., with increasing temporal intervals differences in physical duration are represented with decreasing resolution (Wackermann,
<xref ref-type="bibr" rid="B97">2007</xref>
).</p>
<p>That is, the reported limits in duration reproduction and short-term memory do not point to absolute and static boundaries – correspondingly,
<italic>mental presence</italic>
has no fixed duration – but to a gradual dissolving of representation with increasing duration. Related to this temporal characteristic,
<italic>mental presence</italic>
is related to the fact that once attended objects slowly phase out of experience over time; that is, the phenomenally experienced sliding window of
<italic>mental presence</italic>
co-occurs with the constant loss of memory contents. The moving window of presence is related to the constant sequential input of a sequence of perceived events, which each fade out of working memory one after the other after some time.
<italic>Mental presence</italic>
is a temporal platform of multiple seconds within which an individual is aware of herself and the environment, where sensory–motor perception, cognition, and emotion are interconnected features of representation leading to phenomenal experience.</p>
</sec>
<sec sec-type="">
<title>Conclusion</title>
<p>Facing the puzzle of how we can perceive duration of events if our perception is bound to the present moment, more than 1600 years ago St. Augustine gave an answer (Flasch,
<xref ref-type="bibr" rid="B23">1993</xref>
). Although the present (
<italic>praesens tempus</italic>
) has no extension as it passes away in a moment (
<italic>in puncto praeterit</italic>
), an observation nevertheless has extension (
<italic>distentio</italic>
) through temporally lasting attention (
<italic>attentio</italic>
) which encompasses the anticipation of events (
<italic>expectatio</italic>
) that eventually fade into memory (
<italic>memoria</italic>
); here, anticipation and memory are part of an extended present where attention lasts for some time (Confessions, book XI; section XXVIII.37 in Flasch,
<xref ref-type="bibr" rid="B23">1993</xref>
). Moreover, conscious experience involving a sense of self may only be understood as an entity that is extended over time (Zahavi,
<xref ref-type="bibr" rid="B111">2005</xref>
; Wittmann,
<xref ref-type="bibr" rid="B102">2009</xref>
; Stolzenberg,
<xref ref-type="bibr" rid="B80">2010</xref>
). It is obvious that St. Augustine’s conception of time has strong similarities to Husserl (
<xref ref-type="bibr" rid="B34">1928</xref>
) tripartite structure of present experience. Although a variety of philosophical models concerning the present moments exists, important in the present context is the common insight that the present moment is experienced as extended. Also our everyday language use implies that what is happening at the present moment typically has duration.
<xref ref-type="fn" rid="fn3">
<sup>3</sup>
</xref>
</p>
<p>Present experience on the level of content is a continuously evolving phenomenon and individual events are embedded in an extended temporal field (Stern,
<xref ref-type="bibr" rid="B79">1897</xref>
; Lloyd,
<xref ref-type="bibr" rid="B47">2004</xref>
,
<xref ref-type="bibr" rid="B48">2011</xref>
). A suddenly occurring short stimulus of a few milliseconds might actually be perceived as a point in time. Moreover, psychophysical investigations in which stimulus properties are systematically varied reveal thresholds of experience below which no temporal relationship is perceived. In these limiting cases disclosed by psychophysics one can actually speak of
<italic>functional moments</italic>
without perceivable duration because temporal order, a primary experiential datum, is not detected. This single momentary event is nevertheless part of a continuous and extended experience. For example, if a short tone with a lower pitch is followed by another short tone with a slightly higher pitch, the impression of a single tone rising in pitch can be elicited (Fink et al.,
<xref ref-type="bibr" rid="B21">2006a</xref>
). Within different modalities, the rapid serial appearance of two or more stimuli at different positions can give the impression of apparent motion (Exner,
<xref ref-type="bibr" rid="B20">1875</xref>
; Kirman,
<xref ref-type="bibr" rid="B38">1974</xref>
). That is, the common cases of perception, in accordance with the phenomenological analysis of our
<italic>Lebenswelt</italic>
, suggest that subjective time provides a frame of reference within which moments are stretched out over time.</p>
<p>The integration level of the experienced moment is the basic operational platform within which temporality can evolve. The unit that the first two words in the Beatles lyrics “Hey Jude” form, as short as the overall duration may seem, involves anticipation and memory which are activated while the “Hey” passes over to “Jude” (Lloyd,
<xref ref-type="bibr" rid="B47">2004</xref>
,
<xref ref-type="bibr" rid="B48">2011</xref>
). After having heard “Hey Jude” some people might even anticipate the “…don’t make it bad.” Then, however, the two verses may already fall into two different experienced moments. The break between the two subunits “Hey Jude” and “…don’t make it bad” points to a general principle in poems and in music where
<italic>caesurae</italic>
form boundaries between which individual verses are recited; across different languages and cultures the duration of these lyrical and musical units seems not to exceed 3 s (Pöppel,
<xref ref-type="bibr" rid="B67">1988</xref>
; Turner and Pöppel,
<xref ref-type="bibr" rid="B86">1988</xref>
). Beyond the experienced moment successive events are less strongly bound together. “Hey Jude” is a stronger bounded unit than “Hey Jude, don’t make it bad.” And with increasingly longer intervals temporally separate components within these units will become less strongly connected; retention and protention are temporally limited in the way that they cover only what has just happened and is about to happen in the range of a few seconds, working memory span forming a boundary of present experience as
<italic>mental presence</italic>
. The discussed examples in literature of experienced temporality refer to situations concerning temporal integration in the several seconds range. Husserl (
<xref ref-type="bibr" rid="B34">1928</xref>
, p. 383) discusses the situation of hearing a melody which is only possible because individual tones are integrated to form a perceptual whole. Kelly (
<xref ref-type="bibr" rid="B37">2005</xref>
) presents the example of hearing a steady high C produced by an opera singer who holds that note for some time – for the listener subjectively going on for a long time – that is, for several seconds.</p>
<p>Different from this phenomenological notion of
<italic>retention</italic>
and
<italic>protention</italic>
is the conception of time perspective as a fundamental cognitive dimension partitioning human experience into past, present, and future (Zimbardo and Boyd,
<xref ref-type="bibr" rid="B113">1999</xref>
). Past and future in this context can span decades, as far as long-term memory reaches back in time and as far as we plan our future. Through this partitioning of time, the notion of a presence becomes meaningful since the explicit representation of the present perspective is only possible through its distinction from past and future (Droege,
<xref ref-type="bibr" rid="B14">2009</xref>
). Within the realm of the
<italic>mental presence</italic>
an individual can be considered fully operational as she tracks current conditions, compares them with memories of past incidences, and makes plans for the future. The past and the future as presently experienced can also be explicitly judged in relation to subjective time. When judging the past, we typically perceive the decades of our lives to speed up as we get older (Wittmann and Lehnhoff,
<xref ref-type="bibr" rid="B105">2005</xref>
). Related to the future, we constantly generate predictions about how long it will take for some events to occur, these temporal estimates eventually leading to decisions regarding options with different delays (Wittmann and Paulus,
<xref ref-type="bibr" rid="B106">2009</xref>
). For example, a person who chooses to save money opts for a momentary loss of money that otherwise would be available now in order to gain a future greater benefit.</p>
<p>A fundamental question remains of how lower-level temporal units are bound together forming higher-level units; a variety of concepts has been rigorously discussed by Dainton (
<xref ref-type="bibr" rid="B11">2010</xref>
). Independent of how the sequential units of lower-level units might be related to each other, potentially overlapping each other or following in direct succession, continuity of experience has been considered to stem from an ongoing semantic connection across individual segments, which masks the discontinuity of the sequential units (Pöppel,
<xref ref-type="bibr" rid="B68">1997</xref>
; Droege,
<xref ref-type="bibr" rid="B14">2009</xref>
). Regarding specifically the continuity of experience across
<italic>experienced moments</italic>
, working memory related to semantic and episodic content might bind together the sequence of temporal segments of
<italic>nowness</italic>
that leads to the experience of
<italic>mental presence</italic>
. The
<italic>experienced moment</italic>
is defined as what is occurring
<italic>now</italic>
as immediate experience. It is also a prerequisite for interpersonal communication between two individuals made possible by synchronizing the moments of individuals, thereby creating shared moments of presence for effortless interaction – an essential feature in music, conversation, and dance (Wittmann and Pöppel,
<xref ref-type="bibr" rid="B107">2000</xref>
). However, the experience of a self acting in its environment, remembering the past and planning the future necessitates an integration interval – as has been related to
<italic>mental presence</italic>
– exceeding the postulated 3-s time window of the
<italic>experienced moment</italic>
. Continuity of experience only unfolds as
<italic>mental presence</italic>
, which is a floating window of feeling present and acting at present.</p>
</sec>
<sec sec-type="">
<title>Conflict of Interest Statement</title>
<p>The author declares that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
</body>
<back>
<ack>
<p>This work has been supported by the European project COST ISCH Action TD0904 “Time In MEntaL activitY: theoretical, behavioral, bioimaging, and clinical perspectives (TIMELY;
<uri xlink:type="simple" xlink:href="http://www.timely-cost.eu">www.timely-cost.eu</uri>
).” Over the years, the author’s research was supported by the Bundesministerium für Bildung und Forschung, Germany, the Max Kade Foundation, New York, The National Institute on Drug Abuse, Bethesda, and the Kavli Institute for Brain and Mind, San Diego. I would like to thank Jirí Wackermann, Jürgen Kornmeier, Harald Atmanspacher as well as the two reviewers for helpful comments on the manuscript.</p>
</ack>
<fn-group>
<fn id="fn1">
<p>
<sup>1</sup>
On the level of the
<italic>functional moment</italic>
the concepts of prediction (van Wassenhove et al.,
<xref ref-type="bibr" rid="B91">2005</xref>
) and postdiction (Eagleman and Sejnowski,
<xref ref-type="bibr" rid="B16">2000</xref>
) could be discussed.</p>
</fn>
<fn id="fn2">
<p>
<sup>2</sup>
A famous patient with anterograde amnesia, H.M., as studied by Richards (
<xref ref-type="bibr" rid="B73">1973</xref>
) was supposedly found to show an impaired performance in duration reproduction at longer time intervals. This claim, however, is not substantiated by the available data (Wackermann, personal communication). When plotting the behavioral data of H.M. as absolute values, extracted by Eisler and Eisler (
<xref ref-type="bibr" rid="B19">2001</xref>
), and not as log–log plots one can see a perfect asymptotic curve for stimulus durations ranging from 1 to 300 s. A parametric fit using the ‘dual klepsydra model’ (Wackermann and Ehm,
<xref ref-type="bibr" rid="B99">2006</xref>
) revealed that parameter κ, reflecting the progressive under-reproduction of duration, with 0.011 s
<sup>−1</sup>
is in a typical range of adult subjects (Wackermann,
<xref ref-type="bibr" rid="B96">2005</xref>
). That is, H.M. was able to time his behavior adequately within the time range of his
<italic>mental presence</italic>
.</p>
</fn>
<fn id="fn3">
<p>
<sup>3</sup>
When J. W. Goethe’s Faust proclaims: “When, to the Moment then, I say: Ah, linger on, thou art so fair!” (“Werd ich zum Augenblicke sagen: Verweile doch! Du bist so schön!”), he definitely refers to an extended moment that he would like to see prolonged indefinitely.</p>
</fn>
</fn-group>
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