Abstract
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1.
Characteristics of single units in the trout torus semicircularis to acousticolateral stimulation were investigated with tone bursts.
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2.
Auditory (A) units (33%,N=67), exclusively sensitive to frequencies higher than 125 Hz, and low frequency (L, 12%) units responding to tones up to 125 Hz were found next to the third type, the broadband (B, 55%) unit, sensitive to both low and high frequencies. For many B units sensitivity to intermediate frequencies is absent.
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The sensitivity range of 85% of the units does not exceed 450 Hz.
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Most units (70%) show an increase in spike firing during the tone burst irrespective of frequency (ON units), but for a minority (9%) firing is maximal in the silent intervals (OFF units). OFF units are mostly found among A units. All L units are ON units. The remaining ON/OFF (ON behaviour for some and OFF behaviour for other frequencies) or ON+OFF (ON and OFF behaviour for all frequencies) units are all B units. Tonic ON units are most common.
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Some units show habituation and only sensitive ones may exhibit phase-locking.
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6.
The different behaviour of some B units for low versus high frequencies, as expressed in their ON and OFF behaviour and latencies, presumably reflects convergence of inputs from acousticolateral subsystems with distinct properties.
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Nederstigt, L.J.A., Schellart, N.A.M. Acousticolateral processing in the torus semicircularis of the troutSalmo gairdneri . Pflugers Arch. 406, 151–157 (1986). https://doi.org/10.1007/BF00586676
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DOI: https://doi.org/10.1007/BF00586676