Justin Dixon’s research while affiliated with University of Portsmouth and other places

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Publications (1)


Witnesses in Action: The Effect of Physical Exertion on Recall and Recognition
  • Article
  • Full-text available

March 2012

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1,299 Reads

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50 Citations

Psychological Science

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Justin Dixon

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Understanding memory performance under different operational conditions is critical in many occupational settings. To examine the effect of physical exertion on memory for a witnessed event, we placed two groups of law-enforcement officers in a live, occupationally relevant scenario. One group had previously completed a high-intensity physical-assault exercise, and the other had not. Participants who completed the assault exercise showed impaired recall and recognition performance compared with the control group. Specifically, they provided significantly less accurate information concerning critical and incidental target individuals encountered during the scenario, recalled less briefing information, and provided fewer briefing updates than control participants did. Exertion was also associated with reduced accuracy in identifying the critical target from a lineup. These results support arousal-based competition accounts proposing differential allocation of resources under physiological arousal. These novel findings relating to eyewitness memory performance have important implications for victims, ordinary citizens who become witnesses, and witnesses in policing, military, and related operational contexts.

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Citations (1)


... While attentional and perceptual narrowing may enhance recall of the central features of an event, this may be at the expense of memory for peripheral details (Eysenck et al., 2007;Hope et al., 2016). Indeed, studies of officers involved in actual (e.g., Artwohl, 2002) and simulated Hope et al., 2016;Hope et al., 2012) shooting incidents have reported significant memory deficits, including memory loss and distortions (e.g., seeing, hearing, or experiencing something that did not happen). ...

Reference:

Using Body-Worn Camera Footage to Remember Use-of-Force Incidents
Witnesses in Action: The Effect of Physical Exertion on Recall and Recognition

Psychological Science