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Related Experiment Videos

Mug shot exposure prior to lineup identification: interference, transference, and commitment effects.

J E Dysart1, R C Lindsay, R Hammond

  • 1Department of Psychology, Queen's University, Kingston, Ontario, Canada.

The Journal of Applied Psychology
|January 5, 2002
PubMed
Summary
This summary is machine-generated.

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Viewing mug shots after a crime can impair eyewitness identification. Commitment effects from mug shot exposure significantly increase incorrect identifications in lineups, posing a risk to accuracy.

Area of Science:

  • Psychology
  • Forensic Science
  • Cognitive Psychology

Background:

  • Eyewitness identification accuracy is crucial in the justice system.
  • The impact of mug shot exposure on eyewitness memory and identification is not fully understood.
  • Potential effects include interference, unconscious transference, and commitment.

Purpose of the Study:

  • To investigate the effects of viewing mug shots on subsequent eyewitness identification performance.
  • To determine if mug shot exposure leads to interference, unconscious transference, or commitment effects.
  • To assess the influence of these effects on lineup accuracy.

Main Methods:

  • Two experiments utilized a live staged-crime paradigm.
  • Experiment 1 (N=104) examined interference effects by comparing mug shot and no mug shot groups.

Related Experiment Videos

  • Experiment 2 (N=132) assessed commitment and transference effects in lineup identification.

    • Main Results:

    • No significant difference in correct identification rates between mug shot and control groups in Experiment 1.
    • The commitment group in Experiment 2 made significantly more incorrect identifications compared to control and transference groups.
    • Transference and control groups showed similar false identification rates.

    Conclusions:

    • Mug shot exposure does not appear to cause significant interference in identification accuracy.
    • Commitment effects arising from mug shot searches pose a substantial threat to the reliability of eyewitness identifications.
    • These findings highlight the need for caution when using mug shot evidence in investigations.