Phase Locking to High Frequencies in the Auditory Nerve and Cochlear Nucleus Magnocellularis of the Barn Owl, Tyto alba
作者： Christine Köppl
DOI: 10.1523/JNEUROSCI.17-09-03312.1997
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摘要: The auditory system of the barn owl is an important model for temporal processing on a very fast time scale and neural mechanisms circuitry underlying sound localization. Phase locking has been shown to be behaviorally relevant code. This study examined quality intensity dependence phase in single nerve fibers define input known brainstem circuit processing. For direct comparison same individuals, recordings were also obtained from next higher center, nucleus magnocellularis (NM). was regularly seen at pressure levels (SPL) below those eliciting increase spike rate, thus providing additional cue signal detection. locking, expressed as vector strength, decreased with increasing frequency. Auditory showed unusual step-like decline prominent plateau mid-frequency range (1.5–3 kHz), indicating that some specialization enables halt deterioration extend frequencies up 10 kHz, above commonly observed other species. NM consistently inferior auditory-nerve 1 suggesting synapse plays limiting role precision. response delays, or group derived phase-versus-frequency functions not consistent spatial frequency representation cochlea. questions common assumption delays reflect cochlear wave travel times.
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