Rapid task-related plasticity of spectrotemporal receptive fields in primary auditory cortex

Applications and robotic implementations of auditory processing

Physiological basis of Auditory Streaming in Auditory Cortex

Spectrotemporal analysis in the auditory cortex

Functional organization of early auditory system

Stereausis processing of binaural time-delays

Harmonic templates in pitch perception

VLSI Cochlea Model Chip

Harmonic templates in pitch perception

The pitch of complex sounds plays a key role in grouping sound sources and organizing the perception of acoustic environments. Psychoacoustic and physiological studies of pitch have been dominated in recent years by two opposing views. In one, pitch is presumed to be encoded primarily by the periodic temporal response patterns on the auditory nerve, and is extracted by population auto-correlations in midbrain nuclei. The alternative hypothesis is that pitch is derived from the harmonic spectral pattern of the acoustic stimulus by matching it with harmonic templates postulated to exist also in the auditory midbrain. Both theories suffer from a dearth of evidence in support of the biological substrates necessary to perform the computations in the midbrain (e.g., autocorrelations or harmonic templates). The ideas presented in JASA  2001 paper detail how harmonic templates can in fact emerge in the early stages of the auditory pathway as a natural consequence of cochlear function, and what physiological and anatomical substrates one may search for in establishing the presence of such templates in the auditory midbrain.

Last updated: August 21, 2012

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