Figure 2.

Excitatory synaptic transmission between superficial and intermediate layer neurons. (A) Synaptic currents evoked while holding a premotor neuron at different membrane potentials. The currents increased with increasingly negative holding potentials and reversed their polarity at potentials near 0 mV. (B) Relationship between the peak amplitude of postsynaptic currents and the membrane potential. Each point represents the mean (± SEM) of four responses in the same cell. The reversal potential is approximately 0 mV. (C) Whereas small stimuli evoked small EPSCs, the largest stimuli were capable of evoking action potentials (off-scale on the lowest current trace).