Fig. 4. Cancellation signals are absent after one 30 s coupling period but develop during five 30 s coupling periods separated by 5 min rest periods. An excitatory electrosensory stimulus (2 µV) was coupled with parallel fiber stimulus trains (A) or passive fin movements (B). Note the presence of the cancellation signal in the AEN activity when the parallel fiber trains or fin movements are resumed during the post-coupling period. Rasters, histograms and labels as in previous figures.