Figure 5.

Group mean scores on the PR task. Baseline data are the mean number of responses emitted during 20 baseline sessions (solid bars) compared with the mean responses emitted during a single session after satiation (hatched bars). All monkeys decreased responding after the food reinforcer was devalued by selective satiation. The symbols represent scores for individual monkeys: filled diamond, PFo-1; filled square, PFo-2; filled circle, PFo-3; open circle, Con-1; open right-angled triangle, Con-2; open square, Con-3; open equilateral triangle, Con-4; open plus sign, Con-5; open diamond, Con-6.