Saccadic Eye Movements in Deception

摘要

Informal observations suggest that saccadic eye movements which occur during theperiod beginning when a subject indicates readiness for the next trial and ending at the outset of the following trial may be indicative of subject veracity. The validity of this informal observation was tested by calculating analyses of variance using previously collected data from 10 subjects. Among the measures analyzed were: mean saccade amplitude per trail; total saccade amplitude per trial; and total number of saccades per trial as well as visual fixation frequency; mediation fixation durations in a trial around the mean duration for that trial; and variance of fixation durations in a trial calculated around the mean duration of the entire session. Variables examined included the direction of saccadic movement and subject veracity. While there were sporadic significant differences, it is concluded that there is little support for the hypothesis that post-response saccadic or fixation activity can be used to determine subject veracity. It is emphasized that significant effects indicative of subject veracity were found when subjects were responding to a question, but that this response pattern ceases after the response to the question of interest occurs.