Fig. 5.

Effects of bilateral stimulation versus unilateral stimulation. a1—a3, Filtered field potentialtraces showing seizure activity during three sequential 1 min periods (a1, no stimulus; a2, bilateral stimulation; a3, no stimulus). The stimulus parameters were 9 mA, 333 Hz, and 0.5 msec pulse duration.b—d, Values presented as ratios of stimulus-on/stimulus-off measurements. b, Integrated seizure activity. c, Number of seizures.d, Seizure duration. A solid lineconnects responses contralateral to the stimulation site; aline with long dashes connects responses ipsilateral to the stimulation site; a line withshort dashes connects responses to bilateral stimulation. Responses to bilateral stimulation that are significantly different from those to ipsilateral and contralateral stimulation are represented by an asterisk. Other labeling conventions are described in Figure 3.