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Fig. 1. Two representative examples of paired-pulse depression. (A) An unidentified alpha lobe-extrinsic neuron. All double-pulse values are significantly different from the single pulse value (P<0.001, post hoc tests, main effect: F=33, d.f.=3, P<0.001, N=43, values are means ± S.D.). (B) A PE1 neuron. All values are significantly different from the single-pulse value (*P<0.001, post hoc tests, main effect: F=55.38, d.f.=4, P<0.001, N=43, values are means ± S.D.). (C) Spike train recorded from the neuron in A. Interval between the two pulses = 30 ms. The stimulus artefacts mark the test pulses. The ordinate gives the number of spikes elicited by a single stimulus, and the abscissa plots the interval {Delta}t between the two stimuli in the paired-pulse protocol.