1, 2, 3 crimes you're out: Ocular-motor methods for detecting deception in a multiple-issue screening protocol.

Area of Science:

• Psychology
• Forensic Science
• Physiology

Background:

• The ocular-motor deception test (ODT) previously showed over 80% accuracy in differentiating truthful from deceptive individuals.
• The standard ODT assesses deception on one illicit activity, limiting its application in multi-issue scenarios.

Purpose of the Study:

• To evaluate if ocular-motor measures from a four-topic screening test can distinguish truthful from deceptive individuals.
• To determine if the ODT can pinpoint specific topics answered deceptively.

Main Methods:

• 180 participants were recruited: 60 who stole cash, 60 who stole cash and a gift card, and 60 innocent individuals.
• Participants responded to questions about four mock crimes: theft of cash, theft of a gift card, vandalism, and filing a false report.
• Ocular-motor responses (pupil dilation, reading behavior) were recorded and analyzed using a logistic regression model.

Main Results:

• Participants showed significant ocular-motor changes related to the specific illicit activities they admitted or denied.
• The logistic regression model achieved high classification accuracy: 83.3% for innocent, 91.7% for cash-theft, and 85.5% for cash-and-card-theft groups.
• The model accurately classified deceptive answers for cash (86.1%), VISA card (81.1%), and vandalism (88.3%) statements.

Conclusions:

• A multi-issue ODT, utilizing ocular-motor measures, can effectively discriminate between truthful and deceptive individuals.
• The findings support the ODT's potential value in screening applications requiring the assessment of deception across multiple issues.