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Figure 6


Fig. 6. Responses of DON units (A,B) and tectal units (C,D) to sinusoidal stimuli at different amplitudes. A and C show the overall rate change, i.e. the mean spike rate during stimulation minus the spontaneous rate before stimulus onset. B and D show the phase coupling as measured by D (filled circles indicate significant phase coupling, P<0.01). In the DON, the greatest sensitivity is observed from 0.05 to 3 µV cm–1 (B). However, phase coupling is significant only above 0.3 µV cm–1. In this range, there is no change in overall spike rate (A). Tectal units show phase coupling down to 0.05 µV cm–1 (D).





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