Fig. 6.

Graphs showing shuttle rate (/min) during the 60 s inter-trial-intervals of the last 5 discrimination training sessions for subjects trained on (a) rats (N = 6 Go-pos/NoGo-neg and 6 NoGo-pos/Go-neg rats) and (b) mice (N = 4 Go-pos/NoGo-neg and 6 NoGo-pos/Go-neg mice). Animals trained on the Go-pos task are shown by solid lines and filled circles, and those trained on the NoGo-pos task by dashed lines and open circles. Data are means ± 1 s.e.m.