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Title: Time pressure affects the efficiency of perceptual processing in decisions under conflict
Authors: Dambacher, Michael
Hübner, Ronald
First Published: 2-Feb-2014
Publisher: Springer-Verlag
Citation: Psychological Research, 2015, 79 (1), pp. 83-94
Abstract: The negative correlation between speed and accuracy in perceptual decision making is often explained as a tradeoff, where lowered decision boundaries under time pressure result in faster but more error-prone responses. Corresponding implementations in sequential sampling models confirmed the success of this account, which has led to the prevalent assumption that a second component of decision making, the efficiency of perceptual processing, is largely independent from temporal demands. To test the generality of this claim, we examined time pressure effects on decisions under conflict. Data from a flanker task were fit with a sequential sampling model that incorporates two successive phases of response selection, driven by the output of an early and late stage of stimulus selection, respectively. The fits revealed the canonical decrease of response boundaries with increasing time pressure. In addition, time pressure reduced the duration of non-decisional processes and impaired the early stage of stimulus selection, together with the subsequent first phase of response selection. The results show that the relation between speed and accuracy not only relies on the strategic adjustment of response boundaries but involves variations of processing efficiency. The findings support recent evidence of drift rate modulations in response to time pressure in simple perceptual decisions and confirm their validity in the context of more complex tasks.
DOI Link: 10.1007/s00426-014-0542-z
ISSN: 0340-0727
eISSN: 1430-2772
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2015, Springer-Verlag. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.Follwing the embargo period this version is distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License ( ), which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Appears in Collections:Published Articles, Dept. of Neuroscience, Psychology and Behaviour

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