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Journal of Neuroscience, Vol 10, 1557-1569, Copyright © 1990 by Society for Neuroscience
Resting discharge and response dynamics of horizontal semicircular canal afferents of the toadfish, Opsanus tau
R Boyle and SM Highstein
Department of Otolaryngology, Oregon Health Sciences University, Portland 97201.
The response dynamics of 66 primary afferents of the horizontal
semicircular canal were studied in the toadfish using sinusoidal,
rotational stimuli from 0.001-10 Hz at amplitudes of 5-100 degrees/sec.
Twelve afferents were also tested to constant velocity trapezoids.
Responses to sinusoids were used to classify afferents into 3 broad groups:
(1) low-gain afferents that maintain a relatively linear response re:
stimulus velocity across most of the frequency and amplitude spectra
tested; (2) high-gain afferents that have a velocity sensitivity but also
show a high-frequency gain enhancement and phase advance; and (3) so-called
acceleration afferents that have a response more in phase with stimulus
acceleration than velocity across the tested bandwidth. The afferent's
background discharge was examined in relation to its rotational response.
Low-gain afferents have regular spacing of interspike intervals. High-gain
and acceleration afferents have a widely variable discharge regularity that
is apparently unrelated to their rotational responses. Input/output
transfer models were fit to the response data to describe the low- and
high-pass filtering properties of the 3 afferent groups.
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