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Witnesses Stumbling down Memory Lane: The Effects of Alcohol Intoxication, Retention Interval, and Repeated Interviewing

Journal article
Authors Angelica Hagsand
Emma Roos Af Hjelmsäter
Pär-Anders Granhag
Claudia Fahlke
Anna Söderpalm Gordh
Published in Memory
Volume 25
Issue 4
Pages 531 – 543
ISSN 0965-8211
Publication year 2017
Published at Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry
Department of Psychology
Pages 531 – 543
Language en
Links dx.doi.org/10.1080/09658211.2016.11...
https://gup.ub.gu.se/file/206906
Keywords Alcohol, eyewitness, recall, repeated, reminiscence
Subject categories Cognitive science

Abstract

Intoxicated eyewitnesses are often discredited by investigators and in court, but few studies have examined how alcohol affects witnesses’ memory. The primary aim of the present study was to examine how intoxication (alcohol vs. control), retention interval (immediate vs. one week delay), and number of interviews (one vs. two interviews) affect witnesses’ memory. The participants (N = 99) were randomly assigned to consume either orange juice or alcohol mixed with orange juice, and they all witnessed a filmed mock crime afterwards. The recall took place either (a) immediately and after a one week delay or (b) after a one week delay only. No main effect of alcohol was found on the quantity or quality of the witnesses’ statements. Both intoxicated and sober witnesses recalled more details, and were more accurate, during immediate compared to delayed recall. For witnesses interviewed twice, an average of 30% new details were provided in the second compared to the first interview, and these were highly accurate. In sum, contrary to what one can expect, intoxicated witnesses with a low to moderate blood alcohol concentration (below 0.10%) were reliable witnesses.

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