Fig. 3.

Training causes habituation of siphon withdrawal and simultaneous decrement of action potential number in a siphon motor neuron. A, Siphon withdrawal habituation. Top, Examples of siphon responses to training trials (ISI = 30 sec), recorded by the movement transducer. Bottom, Group summary for siphon response amplitude over trials. B, Siphon motor neuron response decrement. Top, Examples of siphon motor neuron responses (training trials are indicated). Bottom, Group summary shows a significant reduction in the number of action potentials per response over trials. See legend to Figure 2 for statistical significance indicated by asterisks.