Fig. 3.
Ventral root evoked ventral root potentials are transiently depressed after an episode. A, Potentials recorded from the LS4 ventral root in response to stimulation of the LS3 ventral root at various times after a spontaneous episode.B, Time course of the changes in the normalized peak amplitude of the recurrent ventral root potentials for the experiment illustrated in A. The timing of the evoked responses shown in A is illustrated by the lowercase letters on the graph. C, Average of four experiments to show the time course of the changes in the recurrent ventral root potentials. The interepisode intervals have been normalized in B and C, and the occurrence of spontaneous episodes is indicated by the vertical bars. Data are plotted as mean ± SEM. Stimulus parameters: 150–300 μsec; 5–35 μA; stimulus rate, – Hz).