Abstract
The response of single fibers of the goldfish lagenar nerve were recorded extracellularly in response to tonal stimuli generated by a loudspeaker. Measures were made of both the average impulse rate and the degree of phase locking at a number of different stimulus frequencies and sound pressure levels. Phase locking was determined to be a more sensitive and reliable measure of sound pressure sensitivity than impulse rate. Unit tuning curves constructed using phase-locking criteria showed low-pass characteristics above 150 Hz. Wide variability was observed in sensitivity, bandwidth, spontaneous activity and adaptation. Lagenar fibers overlap in sensitivity with type II saccular neurons described by Fay [J. Acoust. Soc. Am. 60, S80 (A) (1976)]. The discharge patterns of lagenar and saccular neurons were analyzed in response to direct vibration of the head and were found to have quite similar directional sensitivities. The results are discussed in terms of the information available to the fish for auditory localization and distance perception. [Work supported by the NSF.]
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