Prefrontal activation during two Japanese Stroop tasks revealed with multi-channel near-infrared spectroscopy

  • Watanabe Yukina
    Department of Psychiatry, Institute of Health Biosciences, the University of Tokushima Graduate School
  • Sumitani Satsuki
    Department of Psychiatry, Institute of Health Biosciences, the University of Tokushima Graduate School
  • Hosokawa Mai
    Department of Psychiatry, Institute of Health Biosciences, the University of Tokushima Graduate School
  • Ohmori Tetsuro
    Department of Psychiatry, Institute of Health Biosciences, the University of Tokushima Graduate School

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The Stroop task is sometimes used in psychiatric research to elicit prefrontal activity, which presumably reflects cognitive functioning. Although there are two Stroop tasks (Kana script and Kanji script) in Japan, it is unclear whether these tasks elicit the same hemoglobin changes. Moreover, it is unclear whether psychological conditions or characteristics influence hemoglobin changes in the Japanese Stroop task. The aim of this study was to clarify whether hemoglobin changes elicited by the two Japanese Stroop tasks accurately reflected cognitive functioning. Hemoglobin changes were measured with multi-channel near-infrared spectroscopy (NIRS) in 100 healthy Japanese participants performing two Japanese Stroop tasks. The Beck-Depression Inventory (BDI), State-Trait-Anxiety Inventory (STAI), and Maudsley Obsessive Compulsive Inventory (MOCI) were administered to participants to identify psychological conditions or personality characteristics. Compared with the Kanji task, the Kana task produced a greater Stroop effect and a larger increase in oxyhemoglobin (oxy-Hb) concentration. Moreover there were no significant correlations between oxy-Hb concentration and BDI, STAI-trait, STAI-state, or MOCI scores. Therefore we found that a participant's psychological conditions or characteristics did not influence the hemodynamic changes during either task. These data suggest the Kana Stroop task is more useful than the Kanji Stroop task for NIRS studies in psychiatric research. J. Med. Invest. 62: 51-55, February, 2015

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