Fig. 1.

Simultaneously recorded firing of an LE sensory neuron, a gill or siphon motor neuron (L7 or LFS), and gill withdrawal in response to stimulation of the siphon with a solenoid-driven tapper.A, Records from a representative experiment showing the responses to taps that either did not (A1) or did (A2) touch the siphon. The square pulse in the gill record indicates the time of the siphon tap. B, Percentage of cases in which there was firing of an LE sensory neuron (LE), firing of a motor neuron (MN), or gill withdrawal (Gill Wd) in response to siphon taps that either did not or did touch the siphon. Preparations were included in these experiments only if direct stimulation of the siphon produced a measurable gill withdrawal.