Dynamic Properties of Primary Auditory Fibers Compared with Cells in the Cochlear Nucleus
- 1 October 1976
- journal article
- research article
- Published by Wiley in Acta Physiologica Scandinavica
- Vol. 98 (2), 157-167
- https://doi.org/10.1111/j.1748-1716.1976.tb00235.x
Abstract
The dynamic properties of the responses of single primary auditory fibers were compared with those of single cells in the [rat] cochlear nucleus. The stimuli were tones (at the unit''s characteristic frequency, CF) that were amplitude-modulated with pseudorandom noise. The dynamic properties were described by the cross-covariance and integrated cross-covariance functions between the recorded discharge rate and the modulation. These 2 measures were shown earlier to be valid approximations of the system''s impulse and step response function, i.e., the change in discharge rate in response to a short impulsive increase (or decrease) in the stimulus intensity and a step increment (or decrement) in the stimulus intensity. The cross-covariance function computed from the responses of fibers had a narrower peak than that of cells indicating that a brief change in stimulus intensity gives rise to a faster change in the discharge rate of fibers than that of cells. The modulation of the discharge rate of cells for a certain degree of amplitude modulation of the sound was usually greater than that of fibers. The range of stimulus intensities where a change in stimulus intensity gives rise to a change in discharge rate was smaller for fibers (about 30 dB) than what was shown earlier for cells (70-80 dB). The cross-covariance function computed from the slow wave responses recorded from the surface of the cochlear nucleus in response to an amplitude-modulated tone had individual peaks that reflect distinct classes of units with regard to latency of unit discharges.This publication has 13 references indexed in Scilit:
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