A note on superadditive probability judgment
نویسندگان
چکیده
Recent studies have demonstrated subadditivity of human probability judgment: the judged probabilities for an event partition sum to more than 1. We report conditions under which people's probability judgments are superadditive instead: the component judgments for a partition sum to less than 1. We interpret both directions of deviation from additivity in a common framework, in which probability judgments are often mediated by judgments of evidence. The two kinds of nonadditivity result from di erences in recruitment of supporting evidence together with reduced processing of nonfocal propositions.
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