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(a) Breakdown of the total spike rate (normalized to control, 19.3Hz) into four contributors. The ie pairs contribute to most of the enhancement overcoming the ee losses. (b) A precisely timed ie pair can evoke a spike in a resting membrane: an excitatory input is given at t =30 ms, and an inhibitory input preceding it by δ ms (Ginh =1). (Gex =0.05.)
