Fig. 2.

Latency, rise time, and decay time constant distributions of evoked EPSCs at three types of mossy fiber synapse.A, Cumulative probability plots are shown of latency distribution from a sample of mossy fiber-evoked EPSCs onto pyramidal neurons (squares), interneuron CI AMPA synapses (circles), and interneuron CP AMPA synapses (triangles). The range and mean latencies were not significantly different across all three synaptic types. The mean latencies from each experiment fell within the range 1.5–3.0 msec at all three synapse types and suggest that in all cases EPSCs were monosynaptic in origin. B, C, Cumulative probability plots of the 10–90% rise time (B) and decay time constant (C) reveal that EPSCs at both interneuron synapse types generally have briefer rise times and decay times than do those observed at equivalent synapses onto CA3 pyramidal neurons.