Fig. 2.

Temporal profile of firing rate changes and behavioral activity after systemic MK801 injection. Peristimulus rate histograms (5-min bins) were normalized by dividing the postinjection firing rates by the baseline firing rate. (A) Neurons with type 1 responses had a sustained increase in firing rate for high doses of MK801. (B) Neurons with type 2 responses were not significantly different from saline. (C) MK801 at moderate and high doses significantly increased stereotypy scores.