FIG. 4.

Superimposed oscilloscope traces (n ≧ 3 sweeps) recorded from a taste-responsive PbN cell (A) and 3 NST neurons (B, C, and D), demonstrating fulfillment of criteria for antidromic activation from ipsilateral PbN (B), contralateral PbN (A and C), and contralateral NST (D). Responses occurred at a constant latency to the PbN (A, B, and C) and NST (D) stimuli (arrow, top), followed closely paired stimulation pulses (middle), and were canceled (▴, bottom) by collision with spontaneously generated action potentials (*). The onset latencies for antidromic activation of the units in A, B, C, and D were 3.9, 2.2, 15.2, and 18.8 ms, respectively. Scale bar = 1 ms in A and B, top traces; 2 ms in middle and bottom traces. The scale bars in units C and D represent 5 ms.