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"Blind" interviewing: Is ignorance bliss?

Jillian R Rivard1, Michelle M Pena2, Nadja Schreiber Compo2

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Summary
This summary is machine-generated.

Blind interviewers, unaware of crime details, elicited more accurate eyewitness testimony and recalled more information than informed interviewers. This suggests pre-interview knowledge may hinder memory recall in eyewitness investigations.

Keywords:
Blind interviewingexpectancy effectseyewitness memoryinvestigator bias

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Area of Science:

  • Cognitive Psychology
  • Forensic Psychology
  • Investigative Interviewing

Background:

  • Current investigative interviewing protocols recommend interviewers review case details before witness interviews.
  • The potential impact of interviewer pre-interview knowledge on eyewitness memory and interview dynamics remains under-explored.

Purpose of the Study:

  • To investigate how interviewer pre-interview awareness of crime details influences eyewitness memory accuracy.
  • To examine the effect of interviewer pre-interview knowledge on interviewer behavior during witness interviews.
  • To assess recall differences between blind and informed interviewers post-interview.

Main Methods:

  • A mock crime scenario was used to study eyewitnesses.
  • Interviewers were either blind to crime details or informed beforehand.
  • Eyewitness memory, interviewer questioning, and post-interview recall were assessed shortly after and one week later.

Main Results:

  • Blind interviewers elicited significantly more correct information from eyewitnesses compared to informed interviewers.
  • Interviewer behavior differed, with blind interviewers more frequently starting with non-suggestive questions.
  • Blind interviewers demonstrated superior recall of witness-provided details when generating post-interview reports.

Conclusions:

  • Pre-interview knowledge of crime details by interviewers may negatively impact eyewitness memory recall.
  • Blind interviewing techniques may promote more objective information gathering and reduce potential biases.
  • Reducing interviewer pre-existing information can enhance the accuracy and completeness of eyewitness accounts.