Ex- and reafferent stimuli and the SOR. A, B, C. Comparison of the EOD pulse behaviour for short switches from 10 Ohm to an open circuit. The response to this stimulus is presented according to whether the switch occurred during the occurrence of EODs (A, reafferent) or in between two consecutive EODs (exafferent, B). In C data are presented for all switches that caused a SOR, irrespective whether the stimulus was ex- or reafferent. The upper trace indicates the recording of the local EOD and the stimulus applied. The raster below the stimulus represents all EODs associated with a given stimulus paradigm, and the histogram at the bottom shows the mean inter-EOD frequency. Stimuli not associated with a novelty response are highlighted in grey in B and C. D Bar-plot showing the probability at which stimuli evoked no response (dark grey), a novelty response (light grey), a SOR but no novelty response (green), or both responses (red). Data are based on three fishes. Note that reafferent stimuli were most efficient in evoking SORs and novelty responses, whereas exafferent stimuli and weak DC pulse had an overall low probability for eliciting either form of behavioural responses.