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Mug shot exposure effects: does size matter?

Michelle R Blunt1, Hunter A McAllister

  • 1Department of Psychology, Southeastern Louisiana University, SLU 10665, 500 Western Avenue, Hammond, LA, 70402, USA.

Law and Human Behavior
|February 1, 2008
PubMed
Summary
This summary is machine-generated.

Mug book size did not affect witness identification accuracy. However, larger mug books may increase commitment to an incorrect suspect and lead to more correct rejections in lineups.

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Area of Science:

  • Cognitive Psychology
  • Forensic Psychology
  • Eyewitness Identification Research

Background:

  • Mug books are commonly used in eyewitness identification procedures.
  • The size of a mug book may influence witness memory and decision-making.
  • Previous research has not fully explored the moderating role of mug book size.

Purpose of the Study:

  • To investigate whether mug book size influences the effects of mug shot exposure on eyewitness identification.
  • To examine potential transference and commitment effects related to mug book size.
  • To analyze the impact of mug book size on lineup performance, including correct rejections.

Main Methods:

  • Participants witnessed a simulated crime and subsequently searched either a small, large, or no mug book.
  • Following mug book exposure, participants viewed a perpetrator-absent lineup containing a critical foil from the mug book.
  • Commitment effect was assessed by analyzing participants who identified the critical foil from the mug book.

Main Results:

  • No significant differences in critical foil lineup identifications were found across mug book size conditions.
  • Evidence of a commitment effect was observed in the large mug book condition.
  • The large mug book condition showed a higher rate of correct rejections in lineups.

Conclusions:

  • Mug book size does not appear to affect transference effects in this simulated identification task.
  • A commitment effect, where witnesses become more committed to a choice made from a larger mug book, may occur.
  • The criterion used for mug book selection might influence lineup decisions, potentially increasing correct rejections with larger mug books.