Chandrasekaran, Chandramouli and Lemus, Luis and Trubanova, Andrea and Gondan, Matthias and Ghazanfar, Asif A. (2011) Monkeys and Humans Share a Common Computation for Face/Voice Integration. PLOS COMPUTATIONAL BIOLOGY, 7 (9): e1002165. ISSN 1553-7358,
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Speech production involves the movement of the mouth and other regions of the face resulting in visual motion cues. These visual cues enhance intelligibility and detection of auditory speech. As such, face-to-face speech is fundamentally a multisensory phenomenon. If speech is fundamentally multisensory, it should be reflected in the evolution of vocal communication: similar behavioral effects should be observed in other primates. Old World monkeys share with humans vocal production biomechanics and communicate face-to-face with vocalizations. It is unknown, however, if they, too, combine faces and voices to enhance their perception of vocalizations. We show that they do: monkeys combine faces and voices in noisy environments to enhance their detection of vocalizations. Their behavior parallels that of humans performing an identical task. We explored what common computational mechanism(s) could explain the pattern of results we observed across species. Standard explanations or models such as the principle of inverse effectiveness and a "race'' model failed to account for their behavior patterns. Conversely, a "superposition model'', positing the linear summation of activity patterns in response to visual and auditory components of vocalizations, served as a straightforward but powerful explanatory mechanism for the observed behaviors in both species. As such, it represents a putative homologous mechanism for integrating faces and voices across primates.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | AUDIOVISUAL SPEECH-PERCEPTION; SUPERIOR TEMPORAL SULCUS; OROFACIAL MOTOR REPRESENTATION; AUDITORY-VISUAL INTERACTIONS; CHIMPANZEE PAN-TROGLODYTES; BIMODAL DIVIDED ATTENTION; MACAQUES MACACA-MULATTA; SACCADIC EYE-MOVEMENTS; OLD-WORLD MONKEYS; MULTISENSORY INTEGRATION; |
| Subjects: | 100 Philosophy & psychology > 150 Psychology |
| Divisions: | Human Sciences > Institut für Psychologie > Lehrstuhl für Psychologie I (Allgemeine Psychologie I und Methodenlehre) - Prof. Dr. Mark W. Greenlee |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 Jun 2020 05:39 |
| Last Modified: | 02 Jun 2020 05:39 |
| URI: | https://pred.uni-regensburg.de/id/eprint/20271 |
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