著者

Ai Yoto Tetsuo Katsuura Koichi Iwanaga Yoshihiro Shimomura

出版者

Japan Society of Physiological Anthropology

雑誌

Journal of PHYSIOLOGICAL ANTHROPOLOGY (ISSN:18806791)

巻号頁・発行日

vol.26, no.3, pp.373-379, 2007 (Released:2007-07-20)

参考文献数

17

被引用文献数

51 83

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This study was designed to investigate the physiological effects of color in terms of blood pressure and the results of electroencephalogram (EEG) as subjects looked at the sheets of paper of various colors. A questionnaire was also used to assess psychological effects. Three colors (red, green, blue) were shown to each subject in randomized order. The various colors showed distinctly different effects on the mean power of the alpha band, theta band, and on the total power in the theta-beta EEG bandwidth and alpha attenuation coefficient (AAC). Scores of the subjective evaluations concerning heavy, excited, and warm feelings also indicated significant differences between red and blue conditions. Against to our prediction, blue elicited stronger arousal than did red as expressed by the results of AAC and the mean power of the alpha band, which conflicted with the results of the subjective evaluations scores. This phenomenon might be caused by bluish light's biological activating effect. The powers of the alpha band, and the theta band, and the total power of the theta-beta bandwidth as measured by EEG showed larger values while the subjects looked at red paper than while they looked at blue paper. This indicated that red possibly elicited an anxiety state and therefore caused a higher level of brain activity in the areas of perception and attention than did the color blue. Red paper's effect to activate the central cortical region with regard to perception and attention was considerably more distinguishable than was the biological activating effect of bluish light in our study.

著者

Ai YOTO Tsuyoshi MORIYAMA Hidehiko YOKOGOSHI Yoriyuki NAKAMURA Tsuyoshi KATSUNO Tsutomu NAKAYAMA

出版者

日本感性工学会

雑誌

International Journal of Affective Engineering (ISSN:21875413)

巻号頁・発行日

vol.13, no.4, pp.227-233, 2014 (Released:2014-12-25)

参考文献数

23

被引用文献数

7

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We investigated the memory task performance and the central nervous activity after smelling two kinds of pan-fired Japanese green tea to examine their physical and psychological effects. Twenty eight subjects participated in this study. We used Koushun and Kouju for test samples, which were made by different manufacturing processes. After smelling each odor sample, a memory task and an arithmetic task were used to test mental stress. Electroencephalogram (EEG) was recorded before and after smelling the test samples, and EEG activity was estimated for 4 frequency bands (alpha 1, alpha 2, beta 1 and beta 2). The profiles of mood states (POMS) and the visual analog scale (VAS) after mental stress task were completed for subjective assessments. The results showed that the odor of Kouju may induce a positive emotion. It may also affect the EEG band power of beta 1 at right frontal region and improve memory task performance.