Fig. 1.

Examples of GC recordings. A, An oscilloscope trace showing the signal from a single microwire placed in GC. One larger and one smaller spike can be seen. The larger spike isNeuron 1 from Figure 2A. Thetrace has a time base of 5 msec per division.B, Extracted waveforms from two channels in a different animal. The signal-to-noise ratio of the left neuron was 6:1; that of the right neuron was 4:1. These areNeurons 1 and 2, respectively, used in Figure 2B. C, The interspike interval plots for the neurons in B. Note the presence of a refractory period in the records of both neurons. k = 1000.