Fig. 3.

EPSP histogram of L4 spiny neurons population converging onto a single L2/3 pyramidal cell. (A) Distribution of 1,575 L4–L2/3 synaptic contacts (from 350 axons) on the dendrites of a L2/3 modeled cell (see Materials and Methods). Each dot may represent more than one synaptic contact. (B) The average amplitude of the resultant 400 EPSPs from each axon is displayed (black squares) superimposed on the average unitary EPSP measured experimentally (gray squares). (C) The average c.v. plotted as a function of the EPSP peak amplitude (model in black, experiments in gray).