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  Visual influences on neurons in voice-sensitive cortex

Perrodin, C., Kayser, C., Logothetis, N., & Petkov, C. (2012). Visual influences on neurons in voice-sensitive cortex. Poster presented at Tucker-Davis Symposium on Advances and Perspectives in Auditory Neurophysiology (APAN 2012), New Orleans, LA, USA.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-9B9D-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-9B9E-F
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Perrodin, C1, 2, Author              
Kayser, C1, 2, Author              
Logothetis, NK2, 3, Author              
Petkov, CI2, 3, Author              
Affiliations:
1Research Group Physiology of Sensory Integration, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497808              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              
3Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              

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 Abstract: The brains of human and nonhuman primates are thought to contain brain regions that have specialized for processing voice and faces. Although voice- and face-sensitive regions have been primarily studied in their respective sensory modalities, recent human functional magnetic resonance imaging (fMRI) studies have suggested that cross-modal interactions occur in these regions. Here, we investigated whether, and how, neuronal activity in a voice region is modulated by visual (face) stimulation. Using fMRI-guided electrophysiology, we targeted neurons in a voice-sensitive region in the right supra-temporal plane of two rhesus macaques. We used dynamic faces and voices of different human and monkey individuals for stimulation, including congruent and incongruent audiovisual pairs. We observed robust non-additive visual influences of facial information on the auditory responses of neurons in this voice-sensitive region. In accordance with previous studies, the direction of the audiovisual interactions seemed primarily determined by the phase of visually-evoked theta oscillations at auditory stimulus onset. Yet, we found that, in addition, speaker-related stimulus features such as caller familiarity and identity and call type, studied within a multifactorial experimental design, differentially modulated the crossmodal effects. In particular, familiar voices consistently elicited larger audiovisual influences than unfamiliar voices, despite auditory responses being similar. Finally, we found neurons to be differentially sensitive to stimulus congruency: the specificity of audiovisual influences was disrupted when violating the congruency of a conspecific voice/face pairing by substituting the monkey face with a human face. In conclusion, our results describe the nature of the visual influences on neuronal responses in a voice-sensitive region in the primate brain. This study links to human fMRI studies on multisensory influences in voice/face regions, provides insights on the neuronal cross-modal effects in these regions and hypothesizes that neurons at facesensitive regions might show comparable multisensory influences from the auditory domain.

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 Dates: 2012-10
 Publication Status: Published in print
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Title: Tucker-Davis Symposium on Advances and Perspectives in Auditory Neurophysiology (APAN 2012)
Place of Event: New Orleans, LA, USA
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Title: Tucker-Davis Symposium on Advances and Perspectives in Auditory Neurophysiology (APAN 2012)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 64 Identifier: -