The roles of physical and physiological simultaneity in audiovisual multisensory facilitation
Identifieur interne : 001770 ( Main/Exploration ); précédent : 001769; suivant : 001771The roles of physical and physiological simultaneity in audiovisual multisensory facilitation
Auteurs : Lynnette M. Leone ; Mark E. MccourtSource :
- i-Perception [ 2041-6695 ] ; 2013.
Abstract
A series of experiments measured the audiovisual stimulus onset asynchrony (SOAAV), yielding facilitative multisensory integration. We evaluated (1) the range of SOAAV over which facilitation occurred when unisensory stimuli were weak; (2) whether the range of SOAAV producing facilitation supported the hypothesis that physiological simultaneity of unisensory activity governs multisensory facilitation; and (3) whether AV multisensory facilitation depended on relative stimulus intensity. We compared response-time distributions to unisensory auditory (A) and visual (V) stimuli with those to AV stimuli over a wide range (300 and 20 ms increments) of SOAAV, across four conditions of varying stimulus intensity. In condition 1, the intensity of unisensory stimuli was adjusted such that
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DOI: 10.1068/i0532
PubMed: 24349682
PubMed Central: 3859565
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">The roles of physical and physiological simultaneity in audiovisual multisensory facilitation</title><author><name sortKey="Leone, Lynnette M" sort="Leone, Lynnette M" uniqKey="Leone L" first="Lynnette M." last="Leone">Lynnette M. Leone</name></author><author><name sortKey="Mccourt, Mark E" sort="Mccourt, Mark E" uniqKey="Mccourt M" first="Mark E." last="Mccourt">Mark E. Mccourt</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">24349682</idno><idno type="pmc">3859565</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3859565</idno><idno type="RBID">PMC:3859565</idno><idno type="doi">10.1068/i0532</idno><date when="2013">2013</date><idno type="wicri:Area/Pmc/Corpus">002003</idno><idno type="wicri:Area/Pmc/Curation">002003</idno><idno type="wicri:Area/Pmc/Checkpoint">000F53</idno><idno type="wicri:Area/Ncbi/Merge">002B68</idno><idno type="wicri:Area/Ncbi/Curation">002B68</idno><idno type="wicri:Area/Ncbi/Checkpoint">002B68</idno><idno type="wicri:Area/Main/Merge">001782</idno><idno type="wicri:Area/Main/Curation">001770</idno><idno type="wicri:Area/Main/Exploration">001770</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">The roles of physical and physiological simultaneity in audiovisual multisensory facilitation</title><author><name sortKey="Leone, Lynnette M" sort="Leone, Lynnette M" uniqKey="Leone L" first="Lynnette M." last="Leone">Lynnette M. Leone</name></author><author><name sortKey="Mccourt, Mark E" sort="Mccourt, Mark E" uniqKey="Mccourt M" first="Mark E." last="Mccourt">Mark E. Mccourt</name></author></analytic><series><title level="j">i-Perception</title><idno type="eISSN">2041-6695</idno><imprint><date when="2013">2013</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>A series of experiments measured the audiovisual stimulus onset asynchrony (SOA<sub>AV</sub>), yielding facilitative multisensory integration. We evaluated (1) the range of SOA<sub>AV</sub> over which facilitation occurred when unisensory stimuli were weak; (2) whether the range of SOA<sub>AV</sub> producing facilitation supported the hypothesis that physiological simultaneity of unisensory activity governs multisensory facilitation; and (3) whether AV multisensory facilitation depended on relative stimulus intensity. We compared response-time distributions to unisensory auditory (A) and visual (V) stimuli with those to AV stimuli over a wide range (300 and 20 ms increments) of SOA<sub>AV</sub>, across four conditions of varying stimulus intensity. In condition 1, the intensity of unisensory stimuli was adjusted such that <italic>d</italic>′ ≈ 2. In condition 2, V stimulus intensity was increased (<italic>d</italic>′ > 4), while A stimulus intensity was as in condition 1. In condition 3, A stimulus intensity was increased (<italic>d</italic>′ > 4) while V stimulus intensity was as in condition 1. In condition 4, both A and V stimulus intensities were increased to clearly suprathreshold levels (<italic>d</italic>′ > 4). Across all conditions of stimulus intensity, significant multisensory facilitation occurred exclusively for simultaneously presented A and V stimuli. In addition, facilitation increased as stimulus intensity increased, in disagreement with inverse effectiveness. These results indicate that the requirements for facilitative multisensory integration include both physical and physiological simultaneity.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Alvarado, J C" uniqKey="Alvarado J">J. C. Alvarado</name></author><author><name sortKey="Vaughan, J W" uniqKey="Vaughan J">J. W. Vaughan</name></author><author><name sortKey="Stanford, T R" uniqKey="Stanford T">T. R. Stanford</name></author><author><name sortKey="Stein, B E" uniqKey="Stein B">B. E. Stein</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Barlow, R B" uniqKey="Barlow R">R. B. Barlow</name></author><author><name sortKey="Snodderly, D M" uniqKey="Snodderly D">D. M. Snodderly</name></author><author><name sortKey="Swadlow, H A" uniqKey="Swadlow H">H. A. Swadlow</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Callan, D E" uniqKey="Callan D">D. E. 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