Evaluation of comfortableness by analysis of fluctuation of frequency of brain waves

虽然到目前为止，服装舒适性的评价都是通过感官检测来进行的，但有必要建立一种客观指标的评价方法。然而，目前还没有建立一种定量的评价方法。舒适性可以通过生理反应来评估，因为它们与感觉和情绪有关。脑电波是人类的一种生理反应。分析脑电波被认为是评估情感的有效方法。为此，我们计划建立一种通过测量和分析脑电波来客观评价服装舒适性的方法。我们通过分析脑电波来评估热适应穿衣服、约束衣服、处理衣服和面料以及食物的好恶。我们使用了两种脑波分析方法。一种是α波功率比分析方法，另一种是脑电情绪谱分析方法。情绪谱分析方法基于脑电的空间和时间序列相关性分析。至于α波的功率比和情绪谱，受试者之间存在较大差异。不舒适条件下的α波功率比小于舒适条件下的功率比。然而，差异并不显著。虽然很难从脑电波中的大量无用信息中提取出决定舒适性或不舒适性的因素，但如果安排好实验条件，这种分析是有可能用于评价服装的舒适性的。

Although comfortableness of clothing has been evaluated by a sensory inspection up to now, it is necessary to establish the method of the evaluation using an objective index. However, a quantitative evaluative method has not been established yet. Comfortableness can be evaluated by physiological reactions because they are related to feelings and emotions. Brain waves are one of the human physiological reactions. Analyzing brain waves is considered an effective method for evaluating feelings. Thereupon, we are planning to establish the objective evaluative method of comfortableness of clothing by measuring and analyzing brain waves. We evaluated thermal adaptation wearing clothing, the restraint of clothing, handling of clothing and fabrics and the likes and dislikes of food by analyzing brain waves.We used two methods of the analysis of brain wave. One was the α-wave power ratio and another was the emotion spectrum analysis method of electro-encephalogram (EEG). The emotion spectrum analysis method is based on the analysis of space and time series correlation of EEG.As for the α-wave power ratio and the emotion spectrum, there were large differences in the subjects. The α-wave power ratio of the uncomfortable conditions was smaller than that of the comfortable conditions. However, the difference was not significant. Though it is difficult to extract the factors that determine comfortableness or uncomfortableness from lots of unwanted information in brain waves, if experimental conditions are arranged, it is possible that such analysis can be used for the evaluation of the comfortableness of clothing.