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Visual modulation of neurons in auditory cortex

MPG-Autoren
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;
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/persons84136

Petkov,  CI
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;

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Zitation

Kayser, C., Petkov, C., & Logothetis, N. (2008). Visual modulation of neurons in auditory cortex. Cerebral Cortex, 18(7), 1560-1574. doi:10.1093/cercor/bhm187.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0013-C82D-0
Zusammenfassung
Our brain integrates the information provided by the different sensory modalities into a coherent percept, and recent studies suggest that this process is not restricted to higher association areas. Here we evaluate the hypothesis that auditory cortical fields are involved in cross-modal processing by probing individual neurons for audiovisual interactions. We find that visual stimuli modulate auditory processing both at the level of field potentials and single-unit activity and already in primary and secondary auditory fields. These interactions strongly depend on a stimulus’ efficacy in driving the neurons but occur independently of stimulus category and for naturalistic as well as artificial stimuli. In addition, interactions are sensitive to the relative timing of audiovisual stimuli and are strongest when visual stimuli lead by 20--80 msec. Exploring the underlying mechanisms, we find that enhancement correlates with the resetting of slow (~10 Hz) oscillations to a phase angle of optimal excitability. These results demonstrate that visual stimuli can modulate the firing of neurons in auditory cortex in a manner that depends on stimulus efficacy and timing. These neurons thus meet the criteria for sensory integration and provide the auditory modality with multisensory contextual information about co-occurring environmental events.