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Articles, Behavioral/Cognitive

The Irrationality of Categorical Perception

Stephen M. Fleming, Laurence T. Maloney and Nathaniel D. Daw
Journal of Neuroscience 4 December 2013, 33 (49) 19060-19070; DOI: https://doi.org/10.1523/JNEUROSCI.1263-13.2013
Stephen M. Fleming
1Department of Psychology and Center for Neural Science, New York University, New York, New York 10003, and
2Department of Experimental Psychology, University of Oxford, Oxford OX1 3UD, United Kingdom
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Laurence T. Maloney
1Department of Psychology and Center for Neural Science, New York University, New York, New York 10003, and
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Nathaniel D. Daw
1Department of Psychology and Center for Neural Science, New York University, New York, New York 10003, and
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Abstract

Perception is often categorical: the perceptual system selects one interpretation of a stimulus even when evidence in favor of other interpretations is appreciable. Such categorization is potentially in conflict with normative decision theory, which mandates that the utility of various courses of action should depend on the probabilities of all possible states of the world, not just that of the one perceived. If these probabilities are lost as a result of categorization, choice will be suboptimal. Here we test for such irrationality in a task that requires human observers to combine perceptual evidence with the uncertain consequences of action. Observers made rapid pointing movements to targets on a touch screen, with rewards determined by perceptual and motor uncertainty. Across both visual and auditory decision tasks, observers consistently placed too much weight on perceptual uncertainty relative to action uncertainty. We show that this suboptimality can be explained as a consequence of categorical perception. Our findings indicate that normative decision making may be fundamentally constrained by the architecture of the perceptual system.

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The Journal of Neuroscience: 33 (49)
Journal of Neuroscience
Vol. 33, Issue 49
4 Dec 2013
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The Irrationality of Categorical Perception
Stephen M. Fleming, Laurence T. Maloney, Nathaniel D. Daw
Journal of Neuroscience 4 December 2013, 33 (49) 19060-19070; DOI: 10.1523/JNEUROSCI.1263-13.2013

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The Irrationality of Categorical Perception
Stephen M. Fleming, Laurence T. Maloney, Nathaniel D. Daw
Journal of Neuroscience 4 December 2013, 33 (49) 19060-19070; DOI: 10.1523/JNEUROSCI.1263-13.2013
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