Imaging study provides new information on how the brain processes sounds of diffe...( ft in cortical response waveshape from ...)

Imaging study provides new information on how the brain processes sounds of different tones

ft in cortical response waveshape from sustained to phasic with increasing rate corresponds to a perceptual shift from individually resolved bursts to fused bursts forming a continuous (but modulated) percept.

Conclusions
At high rates, a train forms a single perceptual "event," the onset and offset of which are delimited by the on and off peaks of phasic cortical responses. While auditory cortex showed a clear, qualitative correlation between perception and response waveshape, the medial geniculate body showed less correlation (since there was less change in waveshape with rate), and the inferior colliculus showed no correlation at all.

Overall, these results suggest a population neural representation of the beginning and the end of distinct perceptual events that is weak or absent in the inferior colliculus, begins to emerge in the medial geniculate body, and is robust in auditory cortex.

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Contact: Donna Krupa
djkrupa1@aol.com
703-527-7357
American Physiological Society
12-Nov-2002

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