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Journal of Neuroscience, Vol 4, 1787-1799, Copyright © 1984 by Society for Neuroscience
Segregation of stimulus phase and intensity coding in the cochlear nucleus of the barn owl
WE Sullivan and M Konishi
The cochlear nucleus of the barn owl is composed of two anatomically
distinct subnuclei, n. magnocellularis (the magnocellular nucleus) and n.
angularis (the angular nucleus). In the magnocellular nucleus, neurons tend
to respond at a particular phase of a stimulus sine wave. Phase locking was
observed for frequencies up to 9.0 kHz. The intensity- spike count
functions of magnocellular units are characterized by high rates of
spontaneous activity, a narrow range of intensities over which spike counts
changed from spontaneous to saturation levels, and a small increase in
spike counts with intensity over that range. In the angular nucleus,
neurons showed little or no tendency to respond at a certain sinusoidal
phase, although some showed weak phase locking for frequencies below 3.5
kHz. Angular units typically had low spontaneous rates, large dynamic
ranges, and large increases in spike counts with intensity, resulting in
high saturation levels. The clear difference between the two nuclei in
sensitivity to both phase and intensity and the reciprocity in response
properties support the hypothesis that each nucleus is specialized to
process one parameter (phase or intensity) and not the other.
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