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The Journal of Neurophysiology Vol. 82 No. 4 October 1999, pp. 2006-2009
Copyright ©1999 by the American Physiological Society
RAPID COMMUNICATION
Volen Center and Department of Biology, Brandeis University, Waltham, Massachusetts 02454-9110
Richards, Kathryn S.,
William L. Miller, and
Eve Marder.
Maturation of Lobster Stomatogastric Ganglion Rhythmic Activity. J. Neurophysiol. 82: 2006-2009, 1999. The stomatogastric ganglion of the adult lobster,
Homarus americanus generates extremely regular pyloric
rhythms with a characteristic period of 0.5-1.5 Hz. To study the
changes in the pyloric rhythm during embryonic and larval development,
we recorded excitatory junctional potentials evoked by lateral pyloric
(LP) neuron activity. Early in development the motor discharge of the
LP neuron was often irregular, preventing use of conventional analysis
methods that rely on extracting burst times to calculate cycle
frequency and its variability. Instead, cycle frequency was determined
for the LP neuron from the peak of the power spectrum obtained from the
occurrence times of excitatory junctional potentials in the p1 muscle. The ratio of the power in the peak to the
power from 0 to 3 Hz was used as a relative measure of the regularity
of the rhythm. Throughout embryonic and the first larval stage, LP neuron activity is slow, irregular, and only weakly periodic. The
regularity of the rhythm increased during midlarval stages, and both
the frequency and regularity increased considerably by the postlarval
stage LIV.
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