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Determining eyewitness identification accuracy using event-related brain potentials (ERPs).

C D Lefebvre1, Y Marchand, S M Smith

  • 1Department of Psychology, Dalhousie University, Halifax, NS, Canada. clefebvr@dal.ca

Psychophysiology
|August 2, 2007
PubMed
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Event-related brain potentials (ERPs) reliably indicate eyewitness recognition accuracy in lineup tasks. The P300 component remains a strong indicator of correct identification, even after a one-week delay.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Forensic Science

Background:

  • Eyewitness identification is crucial in legal proceedings.
  • Accuracy can decline over time and with delays.
  • Neurophysiological measures offer objective insights.

Purpose of the Study:

  • To assess event-related potentials (ERPs) for eyewitness identification accuracy.
  • To investigate the impact of time delays on ERP measures.
  • To determine the P300's utility in lineup tasks.

Main Methods:

  • Participants viewed a simulated crime and later completed a lineup task.
  • Event-related brain potentials (ERPs) were recorded.
  • Time delays (immediate, 1-hour, 1-week) and culprit presence were manipulated.

Related Experiment Videos

Main Results:

  • The P300 component reliably indexed culprit recognition across all delays.
  • Correct identifications showed a strong P300 effect, irrespective of time delay.
  • P300 was attenuated when the culprit was absent from the lineup.

Conclusions:

  • ERPs, specifically the P300, offer a viable neurophysiological index of eyewitness memory.
  • The P300's robustness across time delays supports its use in forensic contexts.
  • This method can help differentiate accurate from inaccurate identifications.