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Examination of the simultaneous auditory and visual stimulus presentation method during the P300-based concealed information test: Using a 1:1:1 target:probe:irrelevant ratio

[Speaker] Hira, Shinji:1
[Co-author] Saragai, Yoko:1, Hamamoto, Yuki:2, Furumitsu, Isato:3
1:Fukuyama University (Japan), 2:Shizuoka Prefectural Police Headquarters (Japan), 3:Hiroshima Shudo University (Japan)

This study examined the effects of combined auditory and visual stimulus presentation in the P300-based concealed information test (CIT) using a 1:1:1 target:probe:irrelevant ratio. Participants comprised nine undergraduate students who provided informed consent. The presented visual and auditory stimuli were target, probe and irrelevant, with each presented simultaneously on the computer display and headphones with a 1,500 ms interstimulus interval. All participants received a family name and mock crime scenario conditions. Participants read the mock crime scenario and performed the P300-based CIT. The number of averaged epochs for the final P300 evaluation was varied between 5, 10, and 20 epochs. Three-factor repeated-measures analysis of variance for P300 amplitude revealed no significant differences in the three main effects and no interactions (p>.05 each). These results suggest that presentation ratio rather than meaningfulness of probes accounts for enhanced P300 to the probes in the CIT using simultaneous auditory and visual stimulus presentation.
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