文章基本信息

标题：Effects of Changes in Arousal Level by Continuous Light Stimulus on Contingent Negative Variation (CNV)
其他标题：Effects of Changes in Arousal Level by Continuous Light Stimulus on Contingent Negative Variation (CNV)
本地全文：下载
作者：
期刊名称：Applied human science : journal of physiological anthropology
印刷版ISSN：1341-3473
电子版ISSN：1341-3473
出版年度：1997
卷号：16
期号：2
页码：55-60
出版社：日本生理人類学会
其他摘要：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.
其他关键词：arousal level;contingent negative variation (CNV);Iuminance;spontaneous EEG