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The experimental sequence of events. (1) A single gamble, consisting of the probability p1 of receiving some dollar amount $x1 (or 0 otherwise). (2) In 12 of the 120 trials, subjects are then asked to indicate whether the probability in the previous screen was greater or less than 40/100 (to engage attention to screen 1). (3) Subjects see a choice screen showing the gamble shown in 1 and a new gamble.
