Figure 5.

Mean echo thresholds as a function of the number of clicks presented with (diamonds, circles) or without (triangles) an initial train of five clicks. Error bars indicate one standard error of the mean. Data in the left panel show the effect of breakdown with increasing number of room B clicks and are, with the exception of the filled symbols, replotted from experiment 1. The right panel shows data from experiment 2 indicating buildup∕re-buildup from the additional room A clicks that followed the room B clicks. See Table 2 for a description of all conditions.