Figure 1.

(a) Subjects viewed a clock face while deciding when to stop a hand that made one clockwise rotation over 5 s. (b) The probability of reward for each of the four conditions across the 5-s trial time. (c) The magnitude of reward for each of the four conditions across the 5-s trial time. (d) The expected value of the reward (probability x magnitude) for each of the four conditions. Note that CEV and CEV-R both have a constant expected value, but differ in the underlying probability and magnitude of reward with respect to time.