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Fig. 3. Responses of a DON unit (A) and two tectal units (B,C) to a 5 Hz sinusoidal
electric field (D). Dashes indicate the occurrence of spikes. Five repetitions
of the stimulations are shown for each unit. The DON unit had a spontaneous
rate that was modulated by the stimulus. Tectal units exhibited little or no
spontaneous activity and showed a few spikes phase locked to the stimulus. (C)
A few units in the tectum developed spikes a few seconds after stimulus
onset.