Figure 7.
Excitation of T cells during a DE-3 burst. A, Extracellular recording of both DP nerves of a ganglion in the course of a crawling episode, as a barrage of spikes was elicited in the T cell (data not shown) by the injection of a 2 nA pulse (IT), applied during a DE-3 burst. B, Graph represents the relationship between the duration of the DE-3 burst during the pulse and duration of the bursts preceding it (mean of three preceding cycles). Line indicates a linear fit (r = 0.60, p = 0.015). C, Box plot represents the relative magnitude of the duration of the DE-3 burst during the pulse (relative to the corresponding mean of the “pre” and “post” values to each pulse). *p < 0.0001, significantly different from 1. D, Box plots represent the magnitude of the cycle period, DE-3 burst duration, and DE-3 firing frequency in the “pre” and “post” fragments indicated in A. B–D, n = 16 pulses in 6 crawling episodes in 4 leeches.