Fig. 10.

CC5 mediates excitatory input to PAS evoked by tactile stimulation of a tentacle. The activity of the ipsilateral PAS recorded intracellularly together with an extracellular recording from the PAn. A, A weak tactile stimulus applied to the ipsilateral tentacle evoked excitatory input to CC5, followed by excitatory input to PAS. B, When CC5 was fired directly by a depolarizing pulse that was adjusted to evoke firing similar to that evoked by the tactile stimulus, PAS fired approximately the same as it did after the tactile stimulus (compare with A).C, When CC5 was hyperpolarized, the tactile stimulus failed to evoke spikes in CC5, and the excitatory input to PAS was eliminated (n = 6).