Figure 5.

Trials per minute. Mean (±SEM) number of trials completed per minute. Subjects are the same as in Figure 2. A reaction to decreasing probability values was only shown by the “non-gambler marmosets,” who increased the number of trials completed per minute to compensate for reward-delivery omission. **P < 0.01 gambler marmosets significantly different from non-gambler marmosets in post hoc test; ^$$ P < 0.01 non-gambler marmosets significantly different from non-gambler rats in post hoc test.