Figure 3

Typical responses of a single unit under anesthesia with first isoflurane and then pentobarbital. Top: Raster plots of the responses to 50-Hz stimulation under isoflurane (left) and pentobarbital (right). Each row on the raster plots represents the spike train of the single unit corresponding to a given stimulus lasting for 2 seconds. Stimuli were presented ten times at each of five amplitudes. Bottom: Mean firing rates as a function of amplitude at the three frequencies tested. Error bars denote the standard deviation.