Effects of Changes in Arousal Level by Continuous Light Stimulus on Contingent Negative Variation (CNV)

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概要

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• The purpose of the present study was to investigate an inverted-U relationship between contingent negative variation (CNV) and arousal level which was influenced by extraneous environment. As an extraneous stirnulant, stimulation by light was adopted, and five levels of luminance conditions, 10 cd/m^2, 100 cd/m^2, 320 cd/m^2, 1,000 cd/m^2, and 1,800 cd/m^2 were provided randomly. Under five luminance conditions, seven subjects who had been accustomed a measurement of CNV executed simple reaction time tasks to evoke CNV. Outside CNV, spontaneous EEG prior to S1 was measured as an indicator for arousal level. As a result, a negative correlation existed between the logarithm of luminance and the relative power value of α waves at Fz. Otherwise, an increase in luminance caused an increase in CNV amplitude until the luminance level reached 320 cd/m^2, beyond which however CNV amplitude was found to decrease. These tendencies were most remarkable in the phase of early CNV at Fz. The low amplitude of early CNV seen in the high luminance conditions was inferred to have been induced by excessive arousal state because of the low relative power value of α waves, while the low amplitude in the low luminance conditions was inferred to have been induced by low arousal state because of the high relative power value of α waves. However, changes in arousal level by light stimulus caused no effect on reaction time. From these findings, it was suggested that a definite "inverted-U" relationship existed between the change in arousal level by light stimulation and resultant CNV, and that it could be discriminated as to whether reduction in CNV is caused by excessive arousal effect of environment by analyzing spontaneous EEG preceding S1.

• 日本生理人類学会の論文

著者

• Higuchi Shigekazu

  Japan National Institute of Occupational Safety and Health

• HIGUCHI Shigekazu

  Department of Public Health, Akita University School of Medicine

• YASUKOUCHI Akira

  Department of Physiological Anthropology, Faculty of Design, Kyushu University

• SATO Masahiko

  Nagasaki Junior College

• 佐藤 方彦

  文化女子大学

• Yasukouchi Akira

  東亜大学 人間科学部

• Yasukouchi Akira

  Department Of Human Living System Design Faculty Of Design Kyushu University

• Higuchi Shigekazu

  福島県立医科大学 衛生学講座

• Sato Masahiko

  Department of Cardiology, Surugadai Nihon Univ. Hospital(The 2nd department of internal medicine)

• Watanuki Shigeki

  Department of Physiological Anthropology, Kyushu University of Design Sciences

• WATANUKI Shigeki

  Graduate School of Design, Kyushu University

• Yasukouchi A

  Faculty Of Design Kyushu University

• Yasukouchi Akira

  Fac. Of Design Kyushu Univ.

• Watanuki Shigeki

  Graduate School Of Design Kyushu University

• Watanuki Shigeki

  Kyushu Institute Of Art

• Watanuki Shigeki

  Department Of Physiological A Nthropologi Kyushu University

• Higuchi Shigekazu

  Department Of Physiological Anthropology Kyushu University Of Design Sciences

• Higuchi Shigekazu

  Department Of Physiologicai Anthropology Kyushu University Of Oesign Sciences

• Watanuki S

  Institute Of Design Kyushu University

• Watanuki S

  Department Of Physiological Anthropology Kyushu University Of Design Sciences

• Watanuki S

  Graduate School Of Design Kyushu University

• Shimada Machiko

  Lotte Co. Ltd. Central Laboratory

• Watanuki Shigeki

  Department Of Physiological Anthropology Kyushu Institute Of Desigin

• Sato Masahiko

  Department Of Cardiology Surugadai Nihon Univ. Hospital(the 2nd Department Of Internal Medicine)

• Sato M

  Bunka Women's Univ.

• Sato Masahiko

  Department Of Physiological Anthropology Bunka Women's University

• Watanuki Shigeki

  Department Of Ergonomics Kyushu University Of Design Sciences

• Watanuki Shigeki

  Institute Of Design Kyushu University

• Yasukouchi Akira

  Depariment Of Physiological Anthropology. Kyushu University Of Desgin Sciences

• Sato Masahiko

  Department Of Cardiology Ohara Medical Center

• Sato Masahiko

  Bunka Woman's University

• Sato Masahiko

  Bunka Women's University

• Sato Masahiko

  Departlent Of Physiological Anthropology Kyushu University Of Design Sciences

• Higuchi Shigekazu

  Department Of Human Science Faculty Of Design Kyushu University

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