Fig. 3.

Evoked responses. a Burst response of a UBC in the current clamp mode due to a presynaptic electrical stimulus. The short delay to EPSP onset (inset) indicated a monosynaptic connection. Stimulation artifacts were removed for clarity. b Bursts of EPSCs in a granule cell in response to presynaptic stimulation, with an average first-peak delay of 35 ms. The responses are reminiscent of the evoked UBC burst shown in panel a. c Trains of EPSCs in a UBC in response to presynaptic stimulation (five stimuli at 200 Hz), with an average first-peak delay of 97 ms. The slow EPSC tails fused into a current plateau lasting several seconds. d Amplitudes of spontaneous and evoked disynaptic EPSCs due to a presynaptic UBC, recorded from nine granule cells (GRCs) and four UBCs. Boxes indicate the first, second (median), and third quartiles. Whiskers indicate the lowest and highest occurring values