長時間単純作業のストレス負荷に対する香り効果の脳波変化;カオス理論に基づく非線形解析を用いた検討 EEG Changes Induced by Odor Effects after Stress of Long Monotonous Work; Application of Nonlinear Analysis Based on Chaos Dynamics(Peer Reviewed)

Access this Article

Search this Article

Author(s)

Abstract

本研究の目的は、心理テストおよび脳波測定にて香りよる生理学的変化をみることであった。脳波解析には非線形解析を用いた。対象は健康成人8名(男性4名、女性4名)とし、内田-クレペリン作業負荷後に心理テスト→香り刺激→脳波測定→嗜好テストをおこなった。香りには4種類の香料(ペパーミント、ベルガモット、ラベンダー、サンダルウッド)および対照(空気)を用いた。この結果、ベルガモット、ラベンダーにより不安傾向が有意に低下した。相関次元(以下:Dc)の経時的変化では左右頭頂部で各セッション間に相関を認めた。さらにDc変化率がベルガモットを「好ましい」とした場合で、左頭頂部において増加した。これらよりDcは嗜好性だけでなく中枢神経系への興奮・抑制作用を反映するものと考えた。この解析方法は大脳高次機能を示すことになると考えた。

Based on the findings of previous studies, we used nonlinear analysis of EEGs to investigate the effects of odor stimuli applied after the stress of monotonous work. Eight healthy adults who took the Uchida-Kraepelin test of working capability as mental working stress were subjects. Immediately after a post-stress session, subjects were exposed to odor or control stimuli. EEGs were concurrently recorded for 2 minutes. Psychological tests indicated that subjective fatigue and trait anxiety levels increased after stress loading, suggesting that subjects were placed under mental and physical stress. Both subjective fatigue and anxiety levels were reduced by any of the four odors when compared to odorless control air. Nonlinear analysis of EEGs indicated that D_c in the post-stress session was lower than in the pre-stress session. The subsequent odor stimuli induced an increase in D_c. Correlations were observed between Δ D_c and stress and stimuli, and changes were significant in the occipital and left parietal regions of the cerebral hemispheres. Our study demonstrated that the effect of odor stimuli on the human body might be associated with higher cerebral function, such as favorite odors and psychological changes including emotional alteration.

Journal

  • Journal of International Society of Life Information Science

    Journal of International Society of Life Information Science 20(2), 721-731, 2002

    International Society of Life Information Science

Cited by:  1

Codes

  • NII Article ID (NAID)
    110001080292
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    1341-9226
  • Data Source
    CJPref  NII-ELS  J-STAGE 
Page Top