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Decoupling sensory from decisional choice biases in perceptual decision making

View ORCID ProfileDaniel Linares, David Aguilar-Lleyda, View ORCID ProfileJoan López-Moliner
doi: https://doi.org/10.1101/062380
Daniel Linares
aInstitut d’Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
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David Aguilar-Lleyda
bCentre d’Économie de la Sorbonne (CNRS & Université Paris 1 Panthéon-Sorbonne), Paris, France
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Joan López-Moliner
cVISCA Group, Department of Cognition, Development and Psychology of Education, Institut de Neurociències, Universitat de Barcelona, Barcelona, Catalonia, Spain
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ABSTRACT

The contribution of sensory and decisional processes to perceptual decision making is still unclear, even in simple perceptual tasks. When decision makers need to select an action from a set of balanced alternatives, any tendency to choose one alternative more often— choice bias—is consistent with a bias in the sensory evidence, but also with a preference to select that alternative independently of the sensory evidence. To decouple sensory from decisional biases, here we asked humans to perform a simple perceptual discrimination task with two symmetric alternatives under two different task instructions. The instructions varied the response mapping between perception and the category of the alternatives. We found that from 32 participants, 30 exhibited sensory biases and 15 decisional biases. The decisional biases were consistent with a criterion change in a simple signal detection theory model. Perceptual decision making, thus, even in simple scenarios, is affected by sensory and decisional choice biases.

IMPACT STATEMENT Perceptual decision making, even in simple scenarios, is affected by sensory and decisional choice biases.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted March 21, 2019.
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Decoupling sensory from decisional choice biases in perceptual decision making
Daniel Linares, David Aguilar-Lleyda, Joan López-Moliner
bioRxiv 062380; doi: https://doi.org/10.1101/062380
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Decoupling sensory from decisional choice biases in perceptual decision making
Daniel Linares, David Aguilar-Lleyda, Joan López-Moliner
bioRxiv 062380; doi: https://doi.org/10.1101/062380

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