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Visual modulation of neurons in auditory cortex.

Christoph Kayser¹, Christopher I Petkov, Nikos K Logothetis

¹Max Planck Institute for Biological Cybernetics, Spemannstrasse 38, 72076 Tübingen, Germany. christoph.kayser@tuebingen.mpg.de

Cerebral Cortex (New York, N.Y. : 1991)

|January 9, 2008

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Visual stimuli influence auditory processing in the brain, even in primary auditory fields. This cross-modal interaction depends on stimulus effectiveness and timing, revealing how the brain integrates sensory information.

Area of Science:

Neuroscience
Auditory Neuroscience
Sensory Integration

Background:

The brain integrates multisensory information for coherent perception.
Cross-modal processing is increasingly found beyond higher association areas.

Purpose of the Study:

To investigate the role of auditory cortical fields in audiovisual cross-modal processing.
To determine if visual stimuli modulate neuronal activity in auditory cortex.

Main Methods:

Probing individual neurons for audiovisual interactions.
Measuring field potentials and single-unit activity in response to visual stimuli.
Analyzing the dependence on stimulus efficacy, category, and timing.

Main Results:

Related Experiment Videos

Visual stimuli modulate auditory processing in primary and secondary auditory fields.
Interactions depend on stimulus efficacy and relative audiovisual timing (visual lead 20-80 ms).
Enhancement correlates with the resetting of slow (approx. 10 Hz) oscillations.

Conclusions:

Auditory cortical fields are involved in cross-modal processing.
Visual stimuli provide multisensory contextual information to the auditory modality.
Neuronal integration in auditory cortex is influenced by visual input efficacy and timing.