Abstract
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. Both directions of deviation from additivity are interpreted in a common framework, in which probability judgments are often mediated by judgments of evidence. The 2 kinds of nonadditivity result from differences in recruitment of supporting evidence together with reduced processing of nonfocal propositions.
Original language | English (US) |
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Pages (from-to) | 210-214 |
Number of pages | 5 |
Journal | Psychological Review |
Volume | 106 |
Issue number | 1 |
DOIs | |
State | Published - Jan 1999 |
All Science Journal Classification (ASJC) codes
- General Psychology