Decoupling sensory from decisional choice biases in perceptual decision making

Author:

Linares Daniel1ORCID,Aguilar-Lleyda David2ORCID,López-Moliner Joan3ORCID

Affiliation:

1. Institut d’Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Barcelona, Spain

2. Centre d’Économie de la Sorbonne (CNRS & Université Paris 1 Panthéon-Sorbonne), Paris, France

3. VISCA Group, Department of Cognition, Development and Psychology of Education, Institut de Neurociències, Universitat de Barcelona, Barcelona, Spain

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.

Funder

Departament de Salut, Generalitat de Catalunya

Catalan Government

Fundación Alicia Koplowitz

Project AEI/Feder, UE

Publisher

eLife Sciences Publications, Ltd

Subject

General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience

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