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Optimality of visual search under ambiguous stimuli
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology. (The Judgment and Decision-Making Group)
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology. (The Judgment and Decision-Making Group)
2017 (English)In: CogSci 2017: Proceedings of the 39th Annual Meeting of the Cognitive Science Society, 2017Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

A hallmark of optimal decision making is that cues are weighted by their reliability. Previous studies have reported evidence for reliability weighting in several human perceptual decision-making tasks in which sensory noise was the only possible source of errors. Here we use a target detection task to test whether optimality generalizes to situations where stimulus ambiguity is an additional source of uncertainty. Target and distractor orientations were drawn from distributions with different means and the level of ambiguity was varied through the amount of overlap between the two distributions. In line with previous studies, we found clear evidence for sensory reliability-weighting, regardless of the level of ambiguity. However, using a richer set of models than before, we also found that the estimated weights deviated from the optimal ones. Finally, we found no effect of ambiguity level on task efficiency, which suggests that subjects optimally accounted for this source of uncertainty.

Place, publisher, year, edition, pages
2017.
National Category
Psychology
Research subject
Psychology
Identifiers
URN: urn:nbn:se:uu:diva-335320ISBN: 978-0-9911967-6-0 OAI: oai:DiVA.org:uu-335320DiVA: diva2:1162374
Conference
CogSci
Available from: 2017-12-04 Created: 2017-12-04 Last updated: 2017-12-04

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CiteExportLink to record
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