In order to study human psychophysiological responses to pleasure and displeasure, we recorded electrocardiogram and electroencephlogram before and after applying skin care products such as skin care lotion and gel to the face. While feeling pleasure, the change ratios of LF/(LF+HF) and of LF/HF on the heart rate variability were negatively correlated with pre-application ratios (r=-0.737 and r=-0.710, respectively), and interbeat interval had no significance. On the other hand, while feeling displeasure, LF/(LF+HF) increased significantly (P<0.05), and the change values of interbeat interval was positively correlated with the pre-application interval (r=0.723). These results indicate that the pleasure brought about by skin care products leads to well-balanced situation of the cardio-autonomic nervous activity with the fluctuation of the cardio-sympathetic nervous activities, and the displeasure depresses that balance. Under low arousal, while feeling pleasure, the regression coefficient of the power spectra of frequency-fluctuation of alpha waves approached to -1, and while feeling displeasure, that dispersed from -1, It was certain that the regression coefficient of the power spectra of frequency-fluctuation of alpha waves can estimate pleasure and displeasure.
抄録全体を表示