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Learning to Detect Deception from Evasive Answers and Inconsistencies across Repeated Interviews: A Study with Lay
Jaume Masip1, Carmen Martínez1, Iris Blandón-Gitlin2
1Department of Social Psychology and Anthropology, University of Salamanca, Salamanca, Spain.
Frontiers in Psychology
|January 23, 2018
Summary
Strategic interviews reveal deception by analyzing evasive answers and inconsistencies. This approach helps identify liars more accurately than simply repeating stories, even for human coders.
Area of Science:
- Psychology
- Forensic Psychology
- Behavioral Science
Background:
- Traditional interview techniques often fail to detect deception as liars may repeat consistent stories.
- Strategic interview approaches can elicit behavioral differences between truth-tellers and liars.
- Human judgment of deception is crucial for applied settings, necessitating clear indicators.
Purpose of the Study:
- To investigate the effectiveness of consistency and evasive answers in detecting deception under a strategic interview protocol.
- To compare human accuracy rates in identifying deception using different cues (consistency, evasiveness, or both).
- To determine if these deception indicators are reliable across different participant groups (students and police officers).
Main Methods:
- Two experiments were conducted with college students (N=475) and police officers (N=142).
- Participants coded interview transcripts for consistency, evasive answers, or a combination of both.
- Veracity judgments were made based on these coded cues, with some participants uninstructed.
Main Results:
- High accuracy rates (60%–90%) were achieved in identifying truthful and deceptive statements.
- Evasive answers were more accurate than consistency alone.
- The combination of consistency and evasive answers yielded the highest accuracy rates.
Conclusions:
- Inconsistencies and evasive answers are reliable indicators of deception when a strategic interview approach hinders the repeat strategy.
- Human coders, even without specific instruction, can effectively use these cues for deception detection.
- The findings support the utility of strategic interviewing in forensic and law enforcement contexts.
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