Non-verbal cues in eyewitness testimonies do not predict accuracy or credibility assessments

Area of Science:

• Psychology
• Law
• Forensic Science

Background:

• Non-verbal behavior is crucial in legal assessments of witness credibility.
• Previous research focused on deception, not recall accuracy.
• Eyewitness testimony accuracy is vital for legal decisions.

Purpose of the Study:

• To investigate the relationship between non-verbal cues and recall memory accuracy in mock eyewitness testimonies.
• To examine if non-verbal cues correlate with statement accuracy, perceived credibility, and witness confidence.
• To explore differences in these associations for native and non-native speakers.

Main Methods:

• Analysis of 36 video-recorded mock eyewitness testimonies (680 statements) of a violent crime.
• Assessment of non-verbal cues, statement accuracy (correct/incorrect), observer-rated credibility, and self-reported confidence.
• Comparison of associations between native and non-native speaking witnesses.

Main Results:

• No significant associations were found between non-verbal cues and statement accuracy.
• Non-verbal cues were not reliably linked to perceived witness credibility.
• Non-native speakers were perceived as less credible, but this was unrelated to their non-verbal behavior.

Conclusions:

• Non-verbal behavior is not a reliable indicator of accuracy or credibility in eyewitness testimonies.
• Common beliefs about the predictive power of non-verbal cues in legal contexts are challenged.
• Caution is advised when using non-verbal cues for evaluating eyewitnesses in legal proceedings.