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A) Higher arousal predicts attenuated gambling during highly risky trials with low odds of winning the lottery (25%). In contrast, higher arousal during low (25%) and medium (50%) levels of ambiguous uncertainty (levels collapsed) resulted in increased gambling. B) Relationship between arousal and choice, controlling for subjective value of a lottery, indicates that arousal predicts greater gambling behavior under ambiguous conditions but has no predictive power during risky conditions.
