Effects of Single- and Multiple-relevant Items Conditions on Differential Psychological and Physiological Responses on the Concealed Information Test

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  • OGAWA Tokihiro
    First Information Science Section, National Research Institute of Police Science
  • MATSUDA Izumi
    First Information Science Section, National Research Institute of Police Science
  • TSUNEOKA Michiko
    First Information Science Section, National Research Institute of Police Science

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Other Title
  • 関連項目数が隠匿情報検査時の心理的・生理的反応に及ぼす影響
  • カンレン コウモクスウ ガ イントク ジョウホウ ケンサジ ノ シンリテキ ・ セイリテキ ハンノウ ニ オヨボス エイキョウ

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Characteristic physiological responses on the concealed information test (CIT) have been a topic of interest. The present study compared physiological responses and self-reported emotion between a single relevant item and a multiple relevant items condition. Participants performed a mock theft where they were asked to steal one or three accessories. They were also asked to choose one or three cards, each indicating a color name. If participants stole one accessory, they would choose three cards; if participants stole three accessories, they would choose one card. Then, participants underwent the CIT, which assessed stolen items and selected colors. The relevant-irrelevant differences in physiological measures, such as skin conductance, respiratory speed, heart rate, and normalized pulse volume, were smaller in the three-relevant items condition than in the one-relevant item condition. Self-reported measures indicated that participants felt surprise and tension during the relevant item presentation. However, the number of relevant items in the question set did not affect self-reported emotion. These results indicate dissociation between physiological and self-reported measures on the CIT.

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