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Visual influences on voice-selective neurons in the anterior superior-temporal plane

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons84132

Perrodin,  C
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Research Group Physiology of Sensory Integration, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84006

Kayser,  C
Research Group Physiology of Sensory Integration, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84063

Logothetis,  NK
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84136

Petkov,  C
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Perrodin, C., Kayser, C., Logothetis, N., & Petkov, C. (2009). Visual influences on voice-selective neurons in the anterior superior-temporal plane. Poster presented at 3rd International Conference on Auditory Cortex (AC 2009), Magdeburg, Germany.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-C33F-5
Abstract
For social interaction and survival primates rely heavily on vocal and facial communication signals from their conspecifics. To date many studies have evaluated the unisensory representations of either vocal or facial information in regions thought to be voice or face selective. Other studies have directly evaluated the multisensory interactions of voices and faces but have focused on posterior auditory regions closer to the primary auditory cortex. This work investigates multisensory interactions at the neuronal level in an auditory region in the anterior superior temporal plane, which contains one of the regions important for processing voice-related information. Extracellular recordings were obtained from the auditory cortex of macaque monkeys, targeting an anterior voice region that we have previously described with functional magnetic resonance imaging (fMRI, Fig. 1A). For stimulation we used movies of vocalizing monkeys and humans which we matched in their low-level auditory and visual features. These dynamic face and voice stimuli allowed us to evaluate how neurons responded to auditory, visual or audio-visual components of the stimuli. Our experiments also contained control conditions consisting of several mismatched audiovisual stimuli combinations, such as 1) a voice matched to a face from a different species, 2) adding a temporal delay in the visual component of the stimulus, or 3) using an acoustically manipulated voice with the original facial stimulus. Our neuronal recordings identified a clustered population of voice-selective sites in the anterior superior temporal plane, ~5 mm anterior to the tonotopically organized field RT (Fig. 1B). A significant visual influence of the dynamic faces on the corresponding (matched) vocalizations was observed in both the local-field potential (LFP) and the spiking activity (analog multiunit activity, AMUA): 38 of the sites showed audiovisual interactions in the LFP signals, and 60 in the AMUA (Fig. 2). In addition, the multisensory influence was significantly stronger for the matching voice and face stimuli than to any of the incongruent (mismatched) control conditions, confirming the specificity of the cross-sensory influence on the neuronal activity. Our results provide evidence for visual influences in what has been characterized as an auditory ‘voice’ area. This visual modulation was specific for behaviorally relevant voice-face associations and demonstrates that the processing of voice-related information in higher auditory regions is influenced by multisensory input.