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Decision noise: An explanation for observed violations of signal detection theory

S. T MUELLER, C. T WEIDEMANN, Christoph Weidemann

Psychonomic Bulletin & Review, Volume: 15, Issue: 3, Pages: 465 - 494

Swansea University Author: Christoph Weidemann

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DOI (Published version): 10.3758/PBR.15.3.465

Abstract

In signal detection theory (SDT), responses are governed by perceptual noise and a flexible decision criterion. Recent criticisms of SDT (see, e.g., Balakrishnan, 1999) have identified violations of its assumptions, and researchers have suggested that SDT fundamentally misrepresents perceptual and d...

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Published in: Psychonomic Bulletin & Review
ISSN: 1069-9384 1531-5320
Published: 2008
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URI: https://cronfa.swan.ac.uk/Record/cronfa6929
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spelling 2019-06-12T14:51:02.7288247 v2 6929 2012-01-28 Decision noise: An explanation for observed violations of signal detection theory b155eeefe08155214e70fea25649223c Christoph Weidemann Christoph Weidemann true false 2012-01-28 FGMHL In signal detection theory (SDT), responses are governed by perceptual noise and a flexible decision criterion. Recent criticisms of SDT (see, e.g., Balakrishnan, 1999) have identified violations of its assumptions, and researchers have suggested that SDT fundamentally misrepresents perceptual and decision processes. We hypothesize that, instead, these violations of SDT stem from decision noise: the inability to use deterministic response criteria. In order to investigate this hypothesis, we present a simple extension of SDT—the decision noise model—with which we demonstrate that shifts in a decision criterion can be masked by decision noise. In addition, we propose a new statistic that can help identify whether the violations of SDT stem from perceptual or from decision processes. The results of a stimulus classification experiment—together with model fits to past experiments—show that decision noise substantially affects performance. These findings suggest that decision noise is important across a wide range of tasks and needs to be better understood in order to accurately measure perceptual processes. Journal Article Psychonomic Bulletin & Review 15 3 465 494 1069-9384 1531-5320 30 6 2008 2008-06-30 10.3758/PBR.15.3.465 http://cogsci.info/papers/MuellerWeidemann2008.pdf COLLEGE NANME Medicine, Health and Life Science - Faculty COLLEGE CODE FGMHL Swansea University 2019-06-12T14:51:02.7288247 2012-01-28T20:23:39.6900000 Faculty of Medicine, Health and Life Sciences School of Psychology S. T MUELLER 1 C. T WEIDEMANN 2 Christoph Weidemann 3
title Decision noise: An explanation for observed violations of signal detection theory
spellingShingle Decision noise: An explanation for observed violations of signal detection theory
Christoph Weidemann
title_short Decision noise: An explanation for observed violations of signal detection theory
title_full Decision noise: An explanation for observed violations of signal detection theory
title_fullStr Decision noise: An explanation for observed violations of signal detection theory
title_full_unstemmed Decision noise: An explanation for observed violations of signal detection theory
title_sort Decision noise: An explanation for observed violations of signal detection theory
author_id_str_mv b155eeefe08155214e70fea25649223c
author_id_fullname_str_mv b155eeefe08155214e70fea25649223c_***_Christoph Weidemann
author Christoph Weidemann
author2 S. T MUELLER
C. T WEIDEMANN
Christoph Weidemann
format Journal article
container_title Psychonomic Bulletin & Review
container_volume 15
container_issue 3
container_start_page 465
publishDate 2008
institution Swansea University
issn 1069-9384
1531-5320
doi_str_mv 10.3758/PBR.15.3.465
college_str Faculty of Medicine, Health and Life Sciences
hierarchytype
hierarchy_top_id facultyofmedicinehealthandlifesciences
hierarchy_top_title Faculty of Medicine, Health and Life Sciences
hierarchy_parent_id facultyofmedicinehealthandlifesciences
hierarchy_parent_title Faculty of Medicine, Health and Life Sciences
department_str School of Psychology{{{_:::_}}}Faculty of Medicine, Health and Life Sciences{{{_:::_}}}School of Psychology
url http://cogsci.info/papers/MuellerWeidemann2008.pdf
document_store_str 0
active_str 0
description In signal detection theory (SDT), responses are governed by perceptual noise and a flexible decision criterion. Recent criticisms of SDT (see, e.g., Balakrishnan, 1999) have identified violations of its assumptions, and researchers have suggested that SDT fundamentally misrepresents perceptual and decision processes. We hypothesize that, instead, these violations of SDT stem from decision noise: the inability to use deterministic response criteria. In order to investigate this hypothesis, we present a simple extension of SDT—the decision noise model—with which we demonstrate that shifts in a decision criterion can be masked by decision noise. In addition, we propose a new statistic that can help identify whether the violations of SDT stem from perceptual or from decision processes. The results of a stimulus classification experiment—together with model fits to past experiments—show that decision noise substantially affects performance. These findings suggest that decision noise is important across a wide range of tasks and needs to be better understood in order to accurately measure perceptual processes.
published_date 2008-06-30T03:08:33Z
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score 11.036706

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