Journal
ECOLOGICAL PSYCHOLOGY
Volume 26, Issue 1-2, Pages 109-124Publisher
ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
DOI: 10.1080/10407413.2014.874923
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- NICHD NIH HHS [R37 HD033486] Funding Source: Medline
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We propose a new way to describe affordances for action. Previous characterizations of affordances treat action possibilities as binary categorieseither possible or impossibleseparated by a critical point. Here, we show that affordances are probabilistic functions, thus accounting for variability in motor performance. By measuring an affordance function, researchers can describe the likelihood of success for every unit of the environment. We demonstrate how to fit an affordance function to performance data using established psychophysical procedures and illustrate how the threshold and variability parameters describe different possibilities for action. Finally, we discuss the implications of probabilistic affordances for development, perception, and decision making.
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