FIG. 3.

Action potentials were sometimes produced after extracellular stimulation 250–300 um lateral to cell in layer V. (A, B) Examples of action potentials evoked prior to the peak of the synaptic current (black trace) overlaid on response to next lowest stimulus intensity (gray). (C) Same as in A and B, except that action potential is evoked at peak of synaptic current. All examples shown are from intact cells of injured cortex. (D) Percent of cells in which action potentials were evoked (total bar height). Also shown by striped region is the percent of cells with action potentials that occur prior to the peak of the evoked excitatory postsynaptic currents. *=z-test; p<0.05. n=12 control, nine 2 d axotomized, seven 2 d axotomized, seven 1 d intact, and five 2 d intact.