Figure 5.

Dissociation between low and high responders in their responding for saccharin and cocaine. (a) High responders (HR, n=11, light gray diamonds) earned a similar number of cocaine infusions as compared with LR (n=12, dark gray diamonds but displayed a progressive decrease in their cocaine intake over time. (b) HR rats tended to access saccharin more often than LR animals but (c) saccharin consumption increased at a similar rate for the two groups (insert: total amount of saccharin consumed).