Laminar fine structure of frequency organization in auditory midbrain

Article

关键词: INFERIOR COLLICULUS;    CENTRAL NUCLEUS;    SPECTRAL INTEGRATION;    COCHLEAR NUCLEUS;    SINGLE UNITS;    CAT;    INHIBITION;    NERVE;    REPRESENTATION;    RESOLUTION;   

DOI  :  10.1038/41106

来源: SCIE

【 摘 要 】

The perception of sound is based on signal processing by a bank of frequency-selective auditory filters, the so-called critical bands(1-3). Here we investigate how the internal frequency organization of the main auditory midbrain station, the central nucleus of the inferior colliculus (ICC), might contribute to the generation of the critical-band behaviour of its neurons. We find a unique spatial arrangement of the frequency distribution in the ICC that correlates with psychophysical critical-band characteristics. Systematic frequency discontinuities along the main tonotopic axis, in combination with a smooth frequency gradient orthogonal to the main tonotopic organization of cat ICC, reflect a layering of the frequency organization paralleling its anatomical laminae. This layered frequency organization is characterized by constant frequency ratios of corresponding locations on neighboring laminae and may provide a spatial framework for the generation of critical bands and for signal processing within(4) and across' frequency bands for the analysis of sound.

【 授权许可】

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