Spectral Gradient Columns in Primary Auditory Cortex: Physiological and Psychoacoustical Correlates
MARYLAND UNIV COLLEGE PARK SYSTEMS RESEARCH CENTER
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Mappings of the spatial distribution of responses in the primary auditory cortex Al reveal that both the gradient of the acoustic spectrum and sensitivity to FM sweep direction are encoded in an orderly manner along the isofrequency planes of Al. Psychoacoustical tests also demonstrate a potential perceptual correlate of the gradient maps, namely the threshold stability and heightened sensitivity of human subjects to the detection of changes in the symmetry of spectral peaks.