Figure 1.

Unitary IPSCs recorded from the VB neuron of a synaptically connected pair of nRt and VB cells. (A) Single action potentials from a presynaptic nRt neuron (nRt-presynaptic, V) evoked by intracellular depolarizing current pulses (I) elicit unitary IPSCs in the postsynaptic VB neuron (VB-postsynaptic). Dotted line marks the peak of action potential in presynaptic neuron. (B) Expanded traces of 35 responses that illustrate the constant IPSC onset latency of 1.5 ms. Arrow, presynaptic action potential peak. (C) Five consecutive responses are superimposed at each indicated holding potential. Reversal potential of the evoked IPSC was −48 mV. Calculated E_Cl = −55 mV. Calibration: 250 pA, 10 ms.