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Combining blink, pupil, and response time measures in a concealed knowledge test.
Travis L Seymour1, Christopher A Baker, Joshua T Gaunt
1Cognitive Modeling Laboratory, Psychology Department, University of California Santa Cruz Santa Cruz, CA, USA.
Frontiers in Psychology
|February 6, 2013
Summary
Ocular measures like pupil size and blink rate can effectively detect concealed knowledge in Concealed Knowledge Tests (CKT). Combining these measures improves accuracy, offering a potential alternative to response time tests.
Area of Science:
- Psychology
- Forensic Science
Background:
- The Concealed Knowledge Test (CKT) using response time (RT) is effective for detecting concealed information.
- Ocular measures (pupil size, blink rate) in CKT have shown variable classification accuracy.
Purpose of the Study:
- To evaluate the efficacy of various pupil and blink responses within the CKT paradigm.
- To determine if combining ocular measures enhances classification accuracy.
Main Methods:
- Assessed concealed knowledge using individual and combined ocular measures (pupil-size, pupil-slope, blink-rate) in a CKT.
- Employed a compound classification procedure for individual participant categorization.
Main Results:
- Individual measures of pupil-size, pupil-slope, and pre-response blink-rate demonstrated efficient classification.
- Combined pupil and blink measures significantly outperformed individual ocular measures in accuracy.
- Combining RT with ocular measures provided minimal additional benefit.
Conclusions:
- Ocular measures, when analyzed appropriately, can be as effective as other CKT indices.
- Combining pupil and blink measures offers a promising approach for improving CKT accuracy.
- Covert ocular monitoring during RT-based CKT may deter countermeasures.
