Abstract
The response of single fibers of the goldfish saccular nerve were recorded extracellularly in response to tonal stimuli. For each unit studied, quantitative measures of phase-lockking (period histograms) were made in response to several tonal frequencies, each presented at a wide range of sound pressure levels. The sensitivity and responsiveness of each unit were plotted as functions of frequency in terms of both spike rate modulation, and phase-locking criteria. Fibers showing little adaptation, high spontaneous firing rates, and low-pass frequency response characteristics were designated type II fibers, while those showing less spontaneous activity, greater adaptation and high-pass frequency characteristics were designated type I fibers, to correspond to an earlier classification [T. Furukawa and Y. Ishii, J. Neurophysiol. 30, 1377–1403 (1967)]. Within each classification, sensitivity, spontaneous activity patterns, phase-physical data on frequency analysis suggest that it is in the temporal patterns of spike activity, and not in the spatial patterns of spike rates that most auditory information is conveyed to the brain. [Work supported by the NSF.]
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