Research article summary (published 14 Sep 2009):

Decisions in changing conditions: the urgency-gating model.

Full Abstract

Several widely accepted models of decision making suggest that, during simple decision tasks, neural activity builds up until a threshold is reached and a decision is made. These models explain error rates and reaction time distributions in a variety of tasks and are supported by neurophysiological studies showing that neural activity in several cortical and subcortical regions gradually builds up at a rate related to task difficulty and reaches a relatively constant level of discharge at a time that predicts movement initiation. The mechanism responsible for this buildup is believed to be related to the temporal integration of sequential samples of sensory information. However, an alternative mechanism that may explain the neural and behavioral data is one in which the buildup of activity is instead attributable to a growing signal related to the urgency to respond, which multiplicatively modulates updated estimates of sensory evidence. These models are difficult to distinguish when, as in previous studies, subjects are presented with constant sensory evidence throughout each trial. To distinguish the models, we presented human subjects with a task in which evidence changed over the course of each trial. Our results are more consistent with "urgency gating" than with temporal integration of sensory samples and suggest a simple mechanism for implementing trade-offs between the speed and accuracy of decisions.

Author information

Author/s: Cisek, Paul (P); Puskas, Geneviève Aude (GA); El-Murr, Stephany (S);

Affiliation: Groupe de Recherche sur le Système Nerveux Central, Département de Physiologie, Université de Montréal, Montréal, Québec H3C 3J7, Canada. paul.cisek(-atsign-)umontreal.ca

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: The Journal of neuroscience : the official journal of the Society for Neuroscience (J Neurosci), published in United States. (Language: eng)

Reference: 2009-Sep; vol 29 (issue 37) : pp 11560-71

Dates: Created 2009/09/17; Completed 2009/10/02;

PMID: 19759303, status: MEDLINE (last retrieval date: 10/2/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adolescent Adult Bias (Epidemiology) Computer Simulation Decision Making - physiology Feedback Female Humans Male

Male Middle Aged Models, Psychological Motion Perception - physiology Psychomotor Performance - physiology Reaction Time - physiology Task Performance and Analysis Time Factors Young Adult

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