Concealed information detection in rapid serial visual presentation with oculomotor measures

An advancement using rapid serial visual presentation (RSVP) in concealed information tests (CIT) has proven effective in detecting concealed information while resisting countermeasures. However, EEG measures used in these methods are often costly and labour-intensive. This research examined whether oculomotor measures can be effective as EEG in RSVP-based CIT, and, if so, which oculomotor measures work best. Thirty-one participants detected a target face among RSVP sequences, which also included either a familiar face (their father or mother’s face, serving as concealed information) or a control face. Analyses focused on pupil size, microsaccade rate, blink rate and blink onset. Results indicated significant pupil dilation at a greater speed in response to familiar faces compared to controls, with no marked effects on microsaccade rate, blink rate or onset. These findings, consistent with analyses of two additional datasets with names as concealed information, show that pupil size is a reliable oculomotor measure in RSVP-based CIT, whereas other measures are not.