Journal
NEUROPSYCHOLOGIA
Volume 45, Issue 3, Pages 598-607Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuropsychologia.2006.01.001
Keywords
McGurk illusion; multisensory; time; psychophysics; analysis-by-synthesis
Funding
- NIDCD NIH HHS [DC 0463801, DC 05660] Funding Source: Medline
- NATIONAL INSTITUTE ON DEAFNESS AND OTHER COMMUNICATION DISORDERS [R56DC005660, R01DC005660] Funding Source: NIH RePORTER
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Forty-three normal hearing participants were tested in two experiments, which focused on temporal coincidence in auditory visual (AV) speech perception. In these experiments, audio recordings of /pa/ and /ba/ were dubbed onto video recordings of /ba/ or /ga/, respectively (A(p)V(k), A(b)V(g)), to produce the illusory fusion percepts /ta/, or /da/ [McGurk, H., & McDonald, J. (1976). Hearing lips and seeing voices. Nature, 264, 746-747]. In Experiment 1, an identification task using McGurk pairs with asynchronies ranging from -467 ms (auditory lead) to +467 ms was conducted. Fusion responses were prevalent over temporal asynchronies from -30 ms to +170 ms and more robust for audio tags. In Experiment 2, simultaneity judgments for incongruent and congruent audiovisual tokens (A(d)V(d), A(t)V(t)) were collected. McGurk pairs were more readily judged as asynchronous than congruent pairs. Characteristics of the temporal window over which simultaneity and fusion responses were maximal were quite similar, suggesting the existence of a 200 ms duration asymmetric bimodal temporal integration window. (c) 2006 Elsevier Ltd. All rights reserved.
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