Dissociation of perception and action in audiovisual multisensory integration
Identifieur interne : 000952 ( Main/Exploration ); précédent : 000951; suivant : 000953Dissociation of perception and action in audiovisual multisensory integration
Auteurs : Lynnette M. Leone ; Mark E. MccourtSource :
- The European Journal of Neuroscience [ 0953-816X ] ; 2015.
Abstract
The ‘temporal rule’ of multisensory integration (
Url:
DOI: 10.1111/ejn.13087
PubMed: 26417674
PubMed Central: 4715611
Affiliations:
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<author><name sortKey="Leone, Lynnette M" sort="Leone, Lynnette M" uniqKey="Leone L" first="Lynnette M." last="Leone">Lynnette M. Leone</name>
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<series><title level="j">The European Journal of Neuroscience</title>
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<front><div type="abstract" xml:lang="en"><title>Abstract</title>
<p>The ‘temporal rule’ of multisensory integration (<styled-content style="fixed-case">MI</styled-content>
) proposes that unisensory stimuli, and the neuronal responses they evoke, must fall within a window of integration. Ecological validity demands that <styled-content style="fixed-case">MI</styled-content>
should occur only for physically simultaneous events (which may give rise to non‐simultaneous neural activations), and spurious neural response simultaneities unrelated to environmental multisensory occurrences must somehow be rejected. Two experiments investigated the requirements of simultaneity for facilitative <styled-content style="fixed-case">MI</styled-content>
. Experiment 1 employed an reaction time (<styled-content style="fixed-case">RT</styled-content>
)/race model paradigm to measure audiovisual (<styled-content style="fixed-case">AV</styled-content>
) <styled-content style="fixed-case">MI</styled-content>
as a function of <styled-content style="fixed-case">AV</styled-content>
stimulus‐onset asynchrony (<styled-content style="fixed-case">SOA</styled-content>
) under fully dark adapted conditions for visual stimuli that were either rod‐ or cone‐isolating. Auditory stimulus intensity was constant. Despite a 155‐ms delay in mean <styled-content style="fixed-case">RT</styled-content>
to the scotopic vs. photopic stimulus, facilitative <styled-content style="fixed-case">AV MI</styled-content>
in both conditions occurred exclusively at an <styled-content style="fixed-case">AV SOA</styled-content>
of 0 ms. Thus, facilitative <styled-content style="fixed-case">MI</styled-content>
demands both physical and physiological simultaneity. Experiment 2 investigated the accuracy of simultaneity and temporal order judgements under the same stimulus conditions. Judgements of <styled-content style="fixed-case">AV</styled-content>
stimulus simultaneity or temporal order were significantly influenced by stimulus intensity, indicating different simultaneity requirements for these tasks. The possibility was considered that there are mechanisms by which the nervous system may take account of variations in response latency arising from changes in stimulus intensity in order to selectively integrate only those physiological simultaneities that arise from physical simultaneities. It was proposed that separate subsystems for <styled-content style="fixed-case">AV MI</styled-content>
exist that pertain to action and perception.</p>
</div>
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