Tatsuya Mori, Yoshikazu Maekawa, Yoko Akiyama, Fumihito Mishima, Koichi Sutani, Sunao Iwaki, and Shigehiro Nishijima
LF/HF, alpha wave, P300, environmental light, control of living environment, feedback
The objective of this study is to presume the human psychological condition with the biological signal in order to feedback the result to the person and to control the living environment automatically depending on the result. In this paper, the influence of living environment on the human body was examined as a fundamental study. The elements that compose the living environment include sound, temperature, humidity and light. Among them, the influ- ence of environmental light on biological response was evaluated. Biological reactions stimulated by red, green and blue light were analysed using an electrocardiogram (ECG), electroencephalogram (EEG) and magnetoencephalogram (MEG). As a result, a significant difference was observed between green and red light in LF/HF, one of the indexes of autonomic nervous system obtained from ECG, in percentage of alpha wave rate ob- tained from EEG and in latent time of P300, one of the event-related potentials, and amplitude of P300 obtained from MEG. In addition, the possibility was suggested that green light induces a rest state whereas red light induces a concentrated state. Based on the results, automated control system of environmental light by biological signal was constructed.
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