Figure 4.

Effect of okadaic acid on long-lasting habituation. A, Results from training in the presence of okadaic acid. The drug was present throughout the experiments. Notice that the reflex exhibited interblock sensitization during training, as indicated by the increase in withdrawal responses to the first several stimuli of each training block. B, Results from habituation training in the presence of 1-nor-okadone. The drug was present throughout the experiments. Traces shown above the graphs in A and B are the individual gill responses recorded during a single experiment. For details, see the legend in Figure 3A.