Fig. 4.

Training causes habituation of siphon withdrawal and simultaneous decrement of action potential number in a tail motor neuron. A, Training causes the siphon withdrawal reflex to habituate. B, As habituation of siphon withdrawal progresses, the tail motor neuron response also decreases.Top, Examples of tail motor neuron responses to tail stimulation training trials are indicated. Bottom, Group summary shows a significant decrease in the number of action potentials per response over trials. See legend to Figure 2 for statistical significance indicated by asterisks.