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Corticomotor Excitability during Observation and Imagination of a Work of Art

Identifieur interne : 001E06 ( Pmc/Curation ); précédent : 001E05; suivant : 001E07

Corticomotor Excitability during Observation and Imagination of a Work of Art

Auteurs : Fortunato Battaglia [États-Unis] ; Sarah H. Lisanby [États-Unis] ; David Freedberg [États-Unis]

Source :

RBID : PMC:3159953

Abstract

We examine the effects of the artistic representation – here exemplified by Michelangelo's Expulsion from Paradise – of an action on the motor system. Using single and paired- pulse transcranial magnetic stimulation we analyze corticomotor excitability during observation of an action in the painting, during imagery of the painting, and during observation of a photograph of the same pose. We also analyze the effects of observation of two further paintings, one showing the same muscles at rest, and in the other in a more overtly emotional context. Both observation of the Expulsion and of imagery of the painting increased cortical excitability. Neither the relaxed pose of Michelangelo's Creation nor the flexed posture in the highly emotional context of Bellini's Dead Christ increased cortical excitability. Observation of a photograph of the same extended pose did not increase cortical excitability either. Moreover, intracortical inhibition was reduced during imagery of the painting. Our results offer clear motor correlates of the relationship between the esthetic quality of a work and the perception of implied movement within it.


Url:
DOI: 10.3389/fnhum.2011.00079
PubMed: 21897813
PubMed Central: 3159953

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PMC:3159953

Le document en format XML

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</div1>
</back>
</TEI>
<pmc article-type="research-article">
<pmc-dir>properties open_access</pmc-dir>
<front>
<journal-meta>
<journal-id journal-id-type="nlm-ta">Front Hum Neurosci</journal-id>
<journal-id journal-id-type="publisher-id">Front. Hum. Neurosci.</journal-id>
<journal-title-group>
<journal-title>Frontiers in Human Neuroscience</journal-title>
</journal-title-group>
<issn pub-type="epub">1662-5161</issn>
<publisher>
<publisher-name>Frontiers Research Foundation</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">21897813</article-id>
<article-id pub-id-type="pmc">3159953</article-id>
<article-id pub-id-type="doi">10.3389/fnhum.2011.00079</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Neuroscience</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Corticomotor Excitability during Observation and Imagination of a Work of Art</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Battaglia</surname>
<given-names>Fortunato</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="author-notes" rid="fn001">*</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Lisanby</surname>
<given-names>Sarah H.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Freedberg</surname>
<given-names>David</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
</contrib-group>
<aff id="aff1">
<sup>1</sup>
<institution>New York College of Podiatric Medicine</institution>
<country>New York, NY, USA</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>Division of Brain Stimulation and Therapeutic Modulation, Department of Psychiatry, Columbia University/New York State Psychiatric Institute</institution>
<country>New York, NY, USA</country>
</aff>
<aff id="aff3">
<sup>3</sup>
<institution>Department of Psychiatry and Behavioral Sciences, Duke University</institution>
<country>Durham, NC, USA</country>
</aff>
<aff id="aff4">
<sup>4</sup>
<institution>Department of Art History and Italian Academy for Advanced Studies, Columbia University</institution>
<country>New York, NY, USA</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>Edited by: Idan Segev, The Hebrew University of Jerusalem, Israel</p>
</fn>
<fn fn-type="edited-by">
<p>Reviewed by: Juliana Yordanova, Bulgarian Academy of Sciences, Bulgaria; Hidenao Fukuyama, Kyoto University, Japan</p>
</fn>
<corresp id="fn001">*Correspondence: Fortunato Battaglia, New York College of Podiatric Medicine, 53 East 124th Street, Room 509, New York, NY 10035, USA. e-mail:
<email>fbattaglia@nycpm.edu</email>
</corresp>
</author-notes>
<pub-date pub-type="epreprint">
<day>08</day>
<month>6</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>23</day>
<month>8</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="collection">
<year>2011</year>
</pub-date>
<volume>5</volume>
<elocation-id>79</elocation-id>
<history>
<date date-type="received">
<day>06</day>
<month>4</month>
<year>2011</year>
</date>
<date date-type="accepted">
<day>26</day>
<month>7</month>
<year>2011</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright © 2011 Battaglia, Lisanby and Freedberg.</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 an exclusive license agreement between the authors and Frontiers Media SA, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are credited and other Frontiers conditions are complied with.</license-p>
</license>
</permissions>
<abstract>
<p>We examine the effects of the artistic representation – here exemplified by Michelangelo's
<italic>Expulsion from Paradise</italic>
– of an action on the motor system. Using single and paired- pulse transcranial magnetic stimulation we analyze corticomotor excitability during observation of an action in the painting, during imagery of the painting, and during observation of a photograph of the same pose. We also analyze the effects of observation of two further paintings, one showing the same muscles at rest, and in the other in a more overtly emotional context. Both observation of the
<italic>Expulsion</italic>
and of imagery of the painting increased cortical excitability. Neither the relaxed pose of Michelangelo's
<italic>Creation</italic>
nor the flexed posture in the highly emotional context of Bellini's
<italic>Dead Christ</italic>
increased cortical excitability. Observation of a photograph of the same extended pose did not increase cortical excitability either. Moreover, intracortical inhibition was reduced during imagery of the painting. Our results offer clear motor correlates of the relationship between the esthetic quality of a work and the perception of implied movement within it.</p>
</abstract>
<kwd-group>
<kwd>art</kwd>
<kwd>transcranial magnetic stimulation</kwd>
<kwd>mental imagery</kwd>
<kwd>mirror neurons</kwd>
<kwd>motor cortex</kwd>
</kwd-group>
<counts>
<fig-count count="4"></fig-count>
<table-count count="0"></table-count>
<equation-count count="0"></equation-count>
<ref-count count="46"></ref-count>
<page-count count="6"></page-count>
<word-count count="4881"></word-count>
</counts>
</article-meta>
</front>
<body>
<sec sec-type="introduction">
<title>Introduction</title>
<p>Works of art arouse a variety of reactions in their beholders. Among the most frequently reported responses is that of a sense that beholders seem to have of imitating the actions of figures in paintings. Several philosophers of art, notably German empathy theorists such as Robert Vischer and Theodor Lipps and the French phenomenologist Maurice Merleau-Ponty, have suggested that viewers of paintings feel bodily engaged by the movements represented within them, but no empirical research has been done on this aspect of response (Vischer,
<xref ref-type="bibr" rid="B44">1872</xref>
; Lipps,
<xref ref-type="bibr" rid="B31">1906</xref>
; Merleau-Ponty,
<xref ref-type="bibr" rid="B32">1962</xref>
).</p>
<p>A still photograph of an action conveys dynamic information. It has been suggested that observers extract dynamic information by extrapolating future position from the motion implied by the photograph (Allison et al.,
<xref ref-type="bibr" rid="B2">2000</xref>
). The processing of such information from static images with implied motion engages brain areas activated during observation of real actions and motor imagery including cortical visual motion area (V5/MT+), extrastriate body area (EBA), superior temporal sulcus (STS; BA38), and motion-related areas (Kourtzi and Kanwisher,
<xref ref-type="bibr" rid="B29">2000</xref>
; Proverbio et al.,
<xref ref-type="bibr" rid="B36">2009</xref>
). Given the skill of 15th and 16th century artists in representing movement, we hypothesized that observation of an action by a painter such as Michelangelo would arouse the same corticomotor responses as the observation of the same action in reality.</p>
<p>Transcranial magnetic stimulation (TMS) can be used to investigate cortico-spinal excitability. The amplitude of the motor evoked potential (MEP), obtained with single-pulse TMS, reflects the firing of cortico-spinal neurons (Hallett,
<xref ref-type="bibr" rid="B22">2000</xref>
). Furthermore, a TMS stimulus delivered during voluntary contraction induces a temporary pause of the target muscle contraction cortical silent period (CSP) due to activation of cortico-spinal inhibitory circuits (Cantello et al.,
<xref ref-type="bibr" rid="B8">1992</xref>
). In addition, when a test stimulus is preceded by a conditioning pulse (subthreshold) the resulting MEP can be either inhibited short-interval intracortical inhibition (SICI) or facilitated intracortical facilitation (ICF; Kujirai et al.,
<xref ref-type="bibr" rid="B30">1993</xref>
). SICI and ICF have proven to be useful parameter for probing inhibitory and facilitatory circuits within primary motor cortex (Ziemann,
<xref ref-type="bibr" rid="B46">2004</xref>
; Fadiga et al.,
<xref ref-type="bibr" rid="B16">2005</xref>
; Battaglia et al.,
<xref ref-type="bibr" rid="B4">2006</xref>
). The technique had also been useful in elucidating the effects of observation of still photographs on motor excitability (Urgesi et al.,
<xref ref-type="bibr" rid="B43">2006</xref>
). But no study had yet been made of corticomotor excitability during the observation of an action represented in a work of art.</p>
<p>In this paper we use to TMS to investigate (1) whether the observation of an action in an artistic representation activates the corticomotor system; (2) whether this effect is attributable to arousal as a result of the emotional context of the actions shown in the work of art or not; (3) whether the mental rehearsal of observation of a painting induces the same degree of corticomotor activation; (4) whether there is any difference between responses to the action in the work of art and a photograph of the same pose.</p>
</sec>
<sec sec-type="materials|methods">
<title>Materials and Methods</title>
<sec>
<title>Subjects</title>
<p>We studied 10 right-handed normal volunteer (7 men, 3 women; age range 29–37 years; mean age, 33.3 ± 2.9 years). All participants gave written informed consent and all experiments conformed to the Declaration of Helsinki. The experimental protocol was approved by the local ethics committee (NYCPM).</p>
</sec>
<sec>
<title>EMG recording</title>
<p>Surface EMG was recorded with disposable adhesive disk electrodes placed in a tendon–belly arrangement over the right extensor carpi radialis (ECR) muscle. The signal was amplified, filtered (bandpass 2–5 kHz), digitized (Micro 1401, Cambridge Electronics Design, Cambridge, UK), and stored in a laboratory computer for off-line analysis. During the experiments EMG activity was continuously monitored by visual (oscilloscope) and auditory (speakers) feedback to ensure either complete relaxation at rest or a constant level of EMG activity during tonic contraction.</p>
</sec>
<sec>
<title>TMS measurements of cortical excitability</title>
<p>We used single-pulse and paired-pulse TMS to induce MEPs and to examine cortical excitability. TMS was performed with a 7-cm figure-of-eight coil and a Magstim 200 stimulator (The Magstim Company, Dyfed, UK). The coil was placed at the optimal position for eliciting MEPs from the right ECR muscle (“hot spot”). The coil was held tangentially to the skull with the handle pointing backward and laterally at an angle of 45° to the sagittal plane. Thus, the electrical current induced in the brain was approximately perpendicular to the central sulcus. This orientation of the induced electrical field is thought to produce a predominantly trans-synaptic activation of the cortico-spinal neurons (Rothwell et al.,
<xref ref-type="bibr" rid="B39">1999</xref>
). During the experiments EMG activity was continuously monitored by either visual (oscilloscope) or auditory (speakers) feedback to ensure complete relaxation.</p>
<p>Resting motor threshold (RMT) was determined as the minimum stimulator intensity (to the nearest 1%) to produce an MEP of 50 μV in five of 10 trials.</p>
<p>To assess MEP amplitude, we used a stimulus intensity of 120% of the RMT. Mean peak-to-peak MEP amplitudes were determined by averaging 10 monophasic magnetic stimuli delivered to the motor hot spot of the ECR muscle.</p>
<p>Cortical silent period was recorded while the subjects were performing about 50% of maximal voluntary contraction (EMG activity was monitored with an audio–video feedback). The CSP was evoked with single-pulse TMS with a stimulus intensity set at 130% of RMT. The duration of 15 CSPs was measured from the end of the MEP until the restart of a constant EMG activity of at least 50% of the pre-stimulus level and was expressed in ms. For CSP measurement, EMG traces were rectified but not averaged.</p>
<p>Short-interval intracortical inhibition and ICF were studied by means of the paired TMS paradigm described by Kujirai et al. (
<xref ref-type="bibr" rid="B30">1993</xref>
) with a subthreshold conditioning stimulation followed by a suprathreshold test stimulation. Inter-stimulus intervals (ISIs) of 2 ms (for SICI) and 10 ms (for ICF) were used. Each study consisted of 10 trials for each ISI, and the test stimuli alone were delivered in random order controlled by a laboratory computer (Signal software, Cambridge Electronics Design, Cambridge, UK). In all the paired-pulse studies, the test stimulus intensity was adjusted in order to evoke motor responses of a matched size (approximately 0.7 mV, peak-top-peak amplitude). TMS parameters were tested according to published guidelines for the use of TMS in clinical neurophysiology (Rossini et al.,
<xref ref-type="bibr" rid="B38">1999</xref>
; Rothwell et al.,
<xref ref-type="bibr" rid="B39">1999</xref>
).</p>
</sec>
<sec>
<title>Experimental conditions</title>
<p>Throughout the experiment subjects were seated comfortably in front of a computer screen (20 inches) placed approximately 50 cm in front of the participant. At the beginning of each block, subjects watched the appropriate video to obtain indication about the experimental task. Each video lasted 6 s and TMS stimuli were delivered after 3 s. Visual stimuli were administered on a Pentium IV computer, using Presentation software (Neurobehavioral Systems, Inc.) to control the presentation and timing of all stimuli. Each condition was presented 20 times, following a pre-determined random order. The order of experiments (1–4) was kept constant across participants.</p>
<sec>
<title>Experiment 1</title>
<p>Here we examined cortico-spinal excitability during
<italic>rest</italic>
and during
<italic>observation of a painting</italic>
(Figure
<xref ref-type="fig" rid="F1">1</xref>
A). The selected painting was Michelangelo's
<italic>Expulsion from Paradise</italic>
in the Sistine Chapel (1508–1512), with its trenchant depiction of the gesture which Adam makes with his extended right hand to keep the sword-bearing angel at bay. We chose this scene for two reasons. Firstly, because Michelangelo, with his habitual skill, clearly delineates the muscles of the forearm involved in the extension of the hand; this action is unequivocally represented and easily legible. Secondly, we did so because the distal muscles involved in this action have an extensive and well defined cortical representation as tested with TMS (Chen et al.,
<xref ref-type="bibr" rid="B10">1998</xref>
). Stimulation of these cortical areas thus elicits MEPs of reliable amplitude. In addition, intracortical mechanisms for inhibition and facilitation in these muscles have been well characterized (Chen et al.,
<xref ref-type="bibr" rid="B10">1998</xref>
). The experiment consisted of eliciting MEP responses while participants observed a rest video providing a signal to relax (REST on a blank screen) or a video displaying the selected painting
<italic>(the Expulsion from Paradise)</italic>
.</p>
<fig id="F1" position="float">
<label>Figure 1</label>
<caption>
<p>
<bold>MEP amplitude during observation of
<italic>Expulsion from Paradise</italic>
</bold>
.
<bold>(A)</bold>
Experimental paradigm used to assess corticomotor excitability during observation of a painting. Two digitized video sequences were presented. In one sequence (REST), the participants were instructed to relax. In a second video, subjects were instructed to observe Adam's gesture in Michelangelo's
<italic>Expulsion from Paradise</italic>
. Each video was presented for 6 s and transcranial magnetic stimuli were delivered after 3 s. Each condition was presented 10 times.
<bold>(B)</bold>
Painting observation increased motor evoked potentials (MEP) size (mean ± SE)* = 
<italic>p</italic>
 < 0.05.</p>
</caption>
<graphic xlink:href="fnhum-05-00079-g001"></graphic>
</fig>
</sec>
<sec>
<title>Experiment 2</title>
<p>We then studied cortical-spinal excitability during observation of hand position in three paintings: Michelangelo's
<italic>Expulsion from Paradise</italic>
, his
<italic>Creation of Adam</italic>
, and Giovanni Bellini's
<italic>Dead Christ with Angels</italic>
(ca. 1465; Ss. Giovanni e Paolo, Venice; Figures
<xref ref-type="fig" rid="F2">2</xref>
A–C). In the
<italic>Expulsion</italic>
the ECR muscle is activated; in the
<italic>Creation</italic>
, it is at rest; in Bellini's
<italic>Dead Christ</italic>
, it is shown at rest in an overtly and highly emotional context. Subjects were asked to look at the video REST or at a video of the paintings.</p>
<fig id="F2" position="float">
<label>Figure 2</label>
<caption>
<p>
<bold>(A–C)</bold>
Corticomotor facilitation during observation of emotionally charged paintings depicting a right hand in different postures.
<bold>(D)</bold>
Only observation of Adam’ gesture in Michelangelo's
<italic>Expulsion from Paradise</italic>
increased motor evoked potentials (MEP) size. (Mean ± SE) * = 
<italic>p</italic>
 < 0.01.</p>
</caption>
<graphic xlink:href="fnhum-05-00079-g002"></graphic>
</fig>
</sec>
<sec>
<title>Experiment 3</title>
<p>In this experiment, subjects were required to observe a REST video (signal to relax) paired with an IMAGERY video (instructing the subjects to mentally rehearse the observation of the painting; Figure
<xref ref-type="fig" rid="F3">3</xref>
A). Prior to TMS, all subjects underwent imagery training. This training protocol was performed under visual feedback of EMG recording of the right ECR muscle to ensure complete target muscle relaxation. The imagery of the painting was externally paced (green triangle on a computer monitor) at a rate of 1 every 10 s in blocks of 30 imagined sequences. At the end of each session, subjects were asked to describe the intensity of vividness of the imagined painting with an arbitrary scale ranging from 0 (no visual sensation) to 6 (perfectly clear sensation). The training was terminated when the subject reached vividness score of four in absence of any ECR muscle contraction.</p>
<fig id="F3" position="float">
<label>Figure 3</label>
<caption>
<p>
<bold>Corticomotor excitability during imagery of a painting</bold>
.
<bold>(A)</bold>
 In one sequence (REST), the participants were instructed to relax. In a second video (IMAGERY), participants were asked to imagine the painting.
<bold>(B)</bold>
Painting observation increased motor evoked potentials (MEP) size and
<bold>(C)</bold>
reduced the amount of short-interval intracortical inhibition. (Mean ± SE) * = 
<italic>p</italic>
 < 0.01.</p>
</caption>
<graphic xlink:href="fnhum-05-00079-g003"></graphic>
</fig>
</sec>
<sec>
<title>Experiment 4</title>
<p>Here we investigated corticomotor responses to observation of Adam's hand action in the painting of the
<italic>Expulsion</italic>
and a photograph of the same action (Figure
<xref ref-type="fig" rid="F4">4</xref>
A).</p>
<fig id="F4" position="float">
<label>Figure 4</label>
<caption>
<p>
<bold>(A,B)</bold>
Corticomotor facilitation during observation of Adam’ arm in Expulsion from Paradise and a photograph of the same pose.
<bold>(C)</bold>
Motor evoked potentials (MEP) increased during observation of Adam’ arm while observation of a photograph of the same pose did not induce significant changes in MEP size. (Mean ± SE) ** = 
<italic>p</italic>
 < 0.01.</p>
</caption>
<graphic xlink:href="fnhum-05-00079-g004"></graphic>
</fig>
<p>The subjects attended two paired video presentations: (1) the video REST paired with the observation of Adam's hand action; (2) the video REST paired with the observation of a poser.</p>
<p>Analysis of variance (ANOVA) was used to assess differences between
<italic>paradigms</italic>
(observation of a paintings, imagery of a painting, photograph). Upon detection of significant main effects, we performed
<italic>post hoc</italic>
analysis to assess differences between
<italic>conditions</italic>
(rest vs. active observation). The statistical analysis was performed using statistical software packages (SPSS software version 13.0 for Windows
<sup>®</sup>
Chicago, IL, USA). The level of significance was set at
<italic>p</italic>
 < 0.05 for all tests.</p>
</sec>
</sec>
</sec>
<sec>
<title>Results</title>
<sec>
<title>Experiment 1</title>
<p>Regarding RMT, ANOVA did not disclose a significant difference between conditions [rest: 54.3 ± 5.1%, painting: 52.7 ± 6.3;
<italic>F</italic>
<sub>(1,18)</sub>
 = 5.4;
<italic>p</italic>
 = 0.1]. On the contrary, observation of the painting increased MEP amplitude [
<italic>F</italic>
<sub>(1,18)</sub>
 = 15.2;
<italic>p</italic>
 = 0.02; Figure
<xref ref-type="fig" rid="F1">1</xref>
B]. CSP duration was found to be no different during the two conditions (rest = 134.1 ± 11.3 ms, painting = 131.8 ± 10.5 ms;
<italic>p</italic>
 > 0.05). Intra-cortical excitability, tested by using the paired-pulse study, revealed that observation of the painting did not induce changes in the in the amount of SICI (rest: 52 ± 9.1%, painting: 56.4 ± 12.5%;
<italic>p</italic>
 = 0.1) and ICF (rest: 144.7 ± 10.03%, painting: 152.7 ± 11.6%;
<italic>p</italic>
 = 0.3).</p>
</sec>
<sec>
<title>Experiment 2</title>
<p>Comparison of neural response to TMS during observation of the three paintings revealed a main effect of
<italic>paradigms</italic>
[
<italic>F</italic>
<sub>(1, 54)</sub>
 = 4.8,
<italic>p</italic>
 = 0.01] without main effect c
<italic>ondition</italic>
[
<italic>F</italic>
<sub>(1,54)</sub>
 = 1.1,
<italic>p</italic>
 = 0.2] with a significant
<italic>paradigms x condition</italic>
interaction [
<italic>F</italic>
<sub>(1,54)</sub>
 = 4.4,
<italic>p</italic>
 = 0.01).
<italic>Post hoc</italic>
<italic>t</italic>
-test showed that only observation of the
<italic>Expulsion from Paradise</italic>
increased MEP (
<italic>p</italic>
 = 0.02) whereas the
<italic>Creation of Adam</italic>
and the
<italic>Dead Christ with Angels</italic>
did not have effect on corticomotor excitability (
<italic>p</italic>
 > 0.05; Figure
<xref ref-type="fig" rid="F2">2</xref>
D). Therefore, the increased in MEP size detected during observation of the
<italic>Expulsion from Paradise</italic>
was due to the artistic representation of an action with a minimal contribution of emotional arousal.</p>
</sec>
<sec>
<title>Experiment 3</title>
<p>Mental rehearsal of the painting modulated corticomotor excitability. RMT [
<italic>F</italic>
<sub>(1,18)</sub>
 = 3.2;
<italic>p</italic>
 = 0.4), CSP [
<italic>F</italic>
<sub>(1,18)</sub>
 = 7.1;
<italic>p</italic>
 = 0.09], and ICF [
<italic>F</italic>
<sub>(1,18)</sub>
 = 4.4;
<italic>p</italic>
 = 0.2] were not different between rest and imagery of the painting. Moreover, imagery of the painting increased MEP amplitude [
<italic>F</italic>
<sub>(1,18)</sub>
 = 25.1;
<italic>p</italic>
 < 0.01] and decreased the amount of SICI [F
<sub>(1,18)</sub>
 = 18.3;
<italic>p</italic>
 < 0.05; Figures
<xref ref-type="fig" rid="F3">3</xref>
B,C).</p>
</sec>
<sec>
<title>Experiment 4</title>
<p>The ANOVA showed a large effect of
<italic>paradigm</italic>
on MEP amplitude. As shown in Figures
<xref ref-type="fig" rid="F4">4</xref>
B,C, observation of Adam's arm (Expulsion) increased MEP size (134.7% compared to REST). On the contrary, observation the same pose induced only a modest, non-significant, increase in MEP amplitude [111.6% compared to REST;
<italic>F</italic>
<sub>(1, 18)</sub>
 = 27,
<italic>p</italic>
 < 0.001].</p>
</sec>
</sec>
<sec sec-type="discussion">
<title>Discussion</title>
<p>This is the first study to investigate the effects on motor output of observation of an action in a painting. It demonstrates that observation of an action in a painting increases cortical-spinal excitability. This effect is the same as the one we found for mental rehearsal of the painting. Observation of a photograph reproducing the same action did not increase MEP amplitude.</p>
<p>Since observation of the photograph did not significantly affect corticomotor excitability, we assume that this effect, in the case of the painting, must be a consequence of the artist's skill in giving the illusory impression of movement. Clearly Michelangelo successfully conveyed the kinesthetic aspects of the movement he depicted in such a way as to overcome the static nature of the image. The degree to which this impression may be due to coloristic, anatomical, and lighting skills remains to be further examined.</p>
<p>MEP amplitude reflects the trans-synaptic excitability of cortico-spinal neurons and spinal motor neurons, and thus provides information about the strength of cortico-spinal connections (Boroojerdi et al.,
<xref ref-type="bibr" rid="B6">2001</xref>
). Given that observation of a movement could also have minor effects on spinal excitability (Baldissera et al.,
<xref ref-type="bibr" rid="B3">2001</xref>
), it is possible that the increase in MEP size we detected during observation of the
<italic>Expulsion from Paradise</italic>
might be due to both cortical and spinal effects.</p>
<p>Recent neuroimaging studies (Kawabata and Zeki,
<xref ref-type="bibr" rid="B25">2004</xref>
) have found that observation of emotionally charged images induces sensory–motor activation. It is unlikely, however, that the increase in MEP size during observation of the
<italic>Expulsion from Paradise</italic>
can be attributed to a general, unspecific increase in arousal (Baumgartner et al.,
<xref ref-type="bibr" rid="B5">2007</xref>
) since the observation of a more overtly emotional scene (
<italic>Bellini's Dead Christ with Angels</italic>
) did not increase MEP size.</p>
<p>While a number of authors have shown that MEP size increases during motor imagery (Fourkas et al.,
<xref ref-type="bibr" rid="B17">2006</xref>
; Stinear et al.,
<xref ref-type="bibr" rid="B41">2006</xref>
), we show, for the first time that imagery of a pictorial work of art modulates cortical excitability. We speculate that since our subjects were required to imagine Adam's gesture in Michelangelo's fresco, our imagery task also involved the kind of kinesthetic information conveyed by the observation of the actual movement itself. In addition, we demonstrate that visual motor memories (imagery of the painting) exert a modulation of intracortical inhibitory circuits as demonstrated by a reduction in the amount of SICI (Di Lazzaro et al.,
<xref ref-type="bibr" rid="B14">2007</xref>
). Our results are in agreement with previous studies (Abbruzzese et al.,
<xref ref-type="bibr" rid="B1">1999</xref>
; Stinear and Byblow,
<xref ref-type="bibr" rid="B40">2004</xref>
) that have provided evidence that SICI can be modulated in a spatially and temporally specific way during imagined motor performance. Given that our study was performed on one hemisphere we do not have information regarding the topographic specificity of motor responses to observation of a work of art. These issues need to be further investigated.</p>
<p>While earlier studies have suggested the involvement of a number of brain areas in esthetic judgment such as the limbic system (Di Dio et al.,
<xref ref-type="bibr" rid="B13">2007</xref>
), orbitofrontal cortex, motor (Kawabata and Zeki,
<xref ref-type="bibr" rid="B25">2004</xref>
), visual (Zeki and Lamb,
<xref ref-type="bibr" rid="B45">1994</xref>
), and frontal areas (Cela-Conde et al.,
<xref ref-type="bibr" rid="B9">2004</xref>
; Jacobsen et al.,
<xref ref-type="bibr" rid="B24">2006</xref>
) our results make clear that esthetic factors have a modulatory effect on motor representations in primary motor cortex. It has been demonstrated (by using both TMS and event related potentials) that static images with implied motion perception activate both motor and visual areas (Urgesi et al.,
<xref ref-type="bibr" rid="B43">2006</xref>
; Proverbio et al.,
<xref ref-type="bibr" rid="B36">2009</xref>
). Visual perception of static body parts engages the EBA (Downing et al.,
<xref ref-type="bibr" rid="B15">2001</xref>
), while ventral premotor cortex plays a critical role in the understanding of complete body postures (Urgesi et al.,
<xref ref-type="bibr" rid="B42">2004</xref>
). It is likely that the same networks are engaged during esthetic understanding (Freedberg and Gallese,
<xref ref-type="bibr" rid="B18">2007</xref>
; Calvo-Merino et al.,
<xref ref-type="bibr" rid="B7">2010</xref>
). With regard to imagery of human body parts, it is likely that different multimodal body representations in the occipito-temporal cortex are engaged in a content-specific manner (Ishai et al.,
<xref ref-type="bibr" rid="B23">2000</xref>
; O'Craven and Kanwisher,
<xref ref-type="bibr" rid="B33">2000</xref>
; Grossman and Blake,
<xref ref-type="bibr" rid="B21">2001</xref>
; Costantini et al.,
<xref ref-type="bibr" rid="B11">2011</xref>
). Our results expand these findings by providing evidence of motor modulation induced by observation of an action in a work of art. It is likely that these responses are not only restricted to representational art. Recent studies have shown a similar pattern of brain activation in the case of less densely descriptive and more abstract images (Kim and Blake,
<xref ref-type="bibr" rid="B26">2007</xref>
; Osaka et al.,
<xref ref-type="bibr" rid="B35">2010</xref>
) and during processing of human motion at a conceptual level, such as during story comprehension (Deen and McCarthy,
<xref ref-type="bibr" rid="B12">2010</xref>
).</p>
<p>On the other hand, we should also consider the possibility that the motor activation we detected might be due to the specific action portrayed in the painting. In primates, electrical stimulation of the poly sensory zone in the precentral gyrus (roughly matching the dorsal part of area F4) induces a contra-lateral defensive posture consistent with the one’ portrayed by Michelangelo in the
<italic>Expulsion from Paradise</italic>
(Graziano et al.,
<xref ref-type="bibr" rid="B19">2002a</xref>
,
<xref ref-type="bibr" rid="B20">b</xref>
). Neurons in the poly sensory zone have bimodal, visual–tactile modalities and represent the space immediately surrounding the body through touch, and vision (Graziano et al.,
<xref ref-type="bibr" rid="B20">2002b</xref>
). Hence, in the case of
<italic>Expulsion from Paradise</italic>
, it is likely that the artistic nature of the action induce a stronger activation in neurons that respond to visual stimuli in both primary motor (Rizzolatti et al.,
<xref ref-type="bibr" rid="B37">1981</xref>
) and premotor cortex (Graziano et al.,
<xref ref-type="bibr" rid="B19">2002a</xref>
). The modulatory effects on motor representations consistent with defending the body against nearby threatening objects might underlie to our TMS results during perception and imagination of the painting.</p>
<p>The present results add considerably to our knowledge of the motor networks engaged in responses to works of art, and enhance our understanding of the felt imitation not just of the actions of others but also of actions in pictorial works of art. The extent to which our findings apply to sculptures remains to be seen. So does the important question of the degree to which prior acquaintance with a work of art might affect MEP size during observation and imagery. For instance, the participants were exposed several times to the painting and were required to mentally rehearse the observation of the work of art. Given that stimulus novelty has been shown to have a significant effect on esthetic perception and judgment (Oliva and Torralba,
<xref ref-type="bibr" rid="B34">2007</xref>
; Kirk,
<xref ref-type="bibr" rid="B27">2008</xref>
; Kirk et al.,
<xref ref-type="bibr" rid="B28">2009</xref>
) it is possible that neural responses to the work of art were shaped by previous experience. Furthermore, future studies are needed to investigate the role of cultural, social, and psychological characteristics of the observer on art perception.</p>
</sec>
<sec>
<title>Conflict of Interest Statement</title>
<p>The authors declare 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>The authors thank all the volunteers that participated in the study. The study was supported by a NYCPM research grant.</p>
</ack>
<sec>
<title>Abbreviations</title>
<p>ECR, extensor carpi radialis; MEP, motor evoked potential; RMT, resting motor threshold; TMS, transcranial magnetic stimulation.</p>
</sec>
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