Fig. 10.

The frequencies of PS bursts in ganglia on opposites sides of a blocked ganglion were sometimes different and, in these cases, intersegmental coordination across the block failed.A, When A3 was blocked, normal coordination of PS4 and PS5 continued, but PS2 bursts occurred less frequently, and the phases of these PS2 bursts relative to PS5 were unstable. B, When A4 was blocked, normal coordination of PS2 and PS3 continued, but PS5 bursts occurred less frequently, and phases of PS2 and PS3 relative to PS5 were random.