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The Journal of Neurophysiology Vol. 82 No. 5 November 1999, pp. 2786-2797
Copyright ©1999 by the American Physiological Society
Volen Center and Biology Department, Brandeis University, Waltham, Massachusetts 02454-9110
Birmingham, J. T.,
Z. B. Szuts,
L. F. Abbott, and
Eve Marder.
Encoding of Muscle Movement on Two Time Scales by a Sensory
Neuron That Switches Between Spiking and Bursting Modes. J. Neurophysiol. 82: 2786-2797, 1999. The
gastropyloric receptor (GPR) neurons of the stomatogastric nervous
system of the crab Cancer borealis are muscle stretch receptors that can fire in either a spiking or a bursting mode of
operation. Our goal is to understand what features of muscle stretch
are encoded by these two modes of activity. To this end, we
characterized the responses of the GPR neurons in both states to
sustained and rapidly varying imposed stretches. The firing rates of
spiking GPR neurons in response to rapidly varying stretches were
directly related to stretch amplitude. For persistent stretches, spiking-mode firing rates showed marked adaptation indicating a more
complex relationship. Interspike intervals of action potentials fired
by GPR neurons in the spiking mode were used to construct an accurate
estimate of the time-dependent amplitude of stretches in the frequency
range of the gastric mill rhythm (0.05-0.2 Hz). Spike trains arising
from faster stretches (similar to those of the pyloric rhythm) were
decoded using a linear filter to construct an estimate of stretch
amplitude. GPR neurons firing in the bursting mode were relatively
unaffected by rapidly varying stretches. However, the burst rate was
related to the amplitude of long, sustained stretches, and very slowly
varying stretches could be reconstructed from burst intervals. In
conclusion, the existence of spiking and bursting modes allows a single
neuron to encode both rapidly and slowly varying stimuli and thus to
report cycle-by-cycle muscle movements as well as average levels of
muscle tension.
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