Figure 3. Cue-elicited sand-tossing during training.

The mean number of trials (± SEM) per block in which Learning and Random subjects exhibited sand tossing behavior in response to the vibratory cue. Because each subject received 6 days of training per week until it pupated, or until the experiment concluded after 10 weeks (blocks) of training, whichever came first, a score of 6 was the maximum score a subject could obtain. However, each data point represents mean performance based only on those subjects receiving training and, thus, remaining in the experiment because they had not yet pupated.