Auditory Processing of Complex Sounds
Annual rept. 1 May 1989-30 Apr 1990
LOYOLA UNIV OF CHICAGO IL PARMLY HEARING INST
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Neurophysiological experiments have been directed at gaining an understanding of how auditory neurons encode pitch related information in the temporal properties of discharge. In general, all physiological neuronal types recorded to date in the chinchilla cochlear nuclea can show periodicities in their discharges that are related to the pitch of harmonic tone complexes, but only those neurons that show phase-locking at best frequency can encode the pitch related information in cost rippled noise. The results of binaural psychophysical experiments suggest 1 that spectrally synthetic binaural processing is the rule when the number of components in the tone complex are relatively few less than 10 and there are no dynamic binaural cues to aid segregation of the target from the background, and 2 that waveforms having large effective envelope depths are on the average more easily lateralized than those having small effective envelope depths.
- Anatomy and Physiology