Human choice behavior in a 2-choice situation involving risk was (a) invariant over 2 risk levels when each S received only 1 risk level, (b) directly related to risk level when each S was exposed to both risk levels. The major difference among groups was depression of performance on low-risk trials for Ss exposed to both risk levels (negative contrast).Negative contrast was also observed in Ss' estimates of event probabilities (ir s )-Choice behavior and ir, were significantly correlated within each experimental condition.
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