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The spatiotemporal gradient of intrusion errors in continuous outcome source memory: Source retrieval is affected by both guessing and intrusions.

Authors
  • Zhou, Jason1
  • Osth, Adam F2
  • Smith, Philip L2
  • 1 Melbourne School of Psychological Sciences, The University of Melbourne, Australia. Electronic address: [email protected]. , (Australia)
  • 2 Melbourne School of Psychological Sciences, The University of Melbourne, Australia. , (Australia)
Type
Published Article
Journal
Cognitive Psychology
Publisher
Elsevier
Publication Date
Mar 01, 2023
Volume
141
Pages
101552–101552
Identifiers
DOI: 10.1016/j.cogpsych.2023.101552
PMID: 36867946
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Previous research has characterized source retrieval as a thresholded process, which fails on a proportion of trials and leads to guessing, as opposed to a continuous process, in which response precision varies across trials but is never zero. The thresholded view of source retrieval is largely based on the observation of heavy tailed distributions of response errors, thought to reflect a large proportion of "memoryless" trials. In this study, we investigate whether these errors might instead reflect systematic intrusions from other list items which can mimic source guessing. Using the circular diffusion model of decision making, which accounts for both response errors and RTs we found that intrusions account for some, but not all, errors in a continuous-report source memory task. We found that intrusion errors were more likely to come from items studied in nearby locations and times, and were well-described by a spatiotemporal gradient model, but not from semantically or perceptually similar cues. Our findings support a thresholded view of source retrieval but suggest that previous work has overestimated the proportion of guesses which have been conflated with intrusions. Copyright © 2023 Elsevier Inc. All rights reserved.

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