Figure 2.

Unit classification. Recorded units (n = 1693; 993 in Experiment 1 and 700 in Experiment 2) were classified into two groups based on mean discharge rate and spike width. Those neurons with mean firing rate <8.83 Hz and spike width >0.276 ms were classified as putative pyramidal cells (PC; n = 1372, 81.0%), and the rest were classified as putative interneurons (IntN; n = 321, 19.0%). The curves are Gaussian fits. Examples of averaged spike waveform for a putative pyramidal cell and a putative interneuron are shown on the right. Calibration: 0.5 ms, 0.1 mV.