Figure 1.

Distinction between putative interneurons (FS units) and pyramidal neurons (RS units). A, The population of putative interneurons had a higher firing rate (abscissa) and narrower spikeform (ordinate, average ± SEM of peak to valley spike width). B, Average waveforms of representative RS and FS units. C, Superimposed composite of all the waveforms for the same units. D, Superimposed average waveforms during two 10 min windows, pre- and post-MK801 administration. The waveforms remained stable after MK801 treatment compared with the predrug period.