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Journal of Neuroscience, Vol 6, 107-119, Copyright © 1986 by Society for Neuroscience
A time-comparison circuit in the electric fish midbrain. I. Behavior and physiology
CE Carr, W Heiligenberg and GJ Rose
Behavioral experiments show that the weakly electric fish, Eigenmannia,
detects differences in timing as small as 400 nsec between electric signals
from different parts of its body surface. The neural basis of this
remarkable temporal resolution was investigated by recording from elements
of the phase-coding system, a chain of electrotonically connected neurons
devoted to the processing of temporal information. Each element of this
system fires a single action potential for every cycle of the electric
signal (either the fish's own electric organ discharge or a sinusoidal
signal of similar frequency). For phase- coding primary afferents and
midbrain neurons, the temporal resolution was determined by measuring each
unit's capacity to lock its spike to a particular phase of the stimulus
cycle. The jitter of a neuron's response (measured as the standard
deviation of the timing of the spikes with respect to the stimulus)
decreases from the level of the primary afferent (mean = 30 microsec) to
the midbrain torus (mean = 11 microsec); these results can be correlated
with morphological measures of convergence. The temporal resolution of
single neurons is still inferior to that displayed at the behavioral level.
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