PHYSIOLOGICAL ANALYSIS OF MOOD STATE USING SPONTANEOUS RHYTHMIC OSCILLATION MEASURED WITH LASER DOPPLER FLOWMETRY

Abstract

We have focused the spontaneous rhythmic skin blood flow fluctuation on forehead (the oscillation, main frequency 0.1 to 0.2Hz) measured with the laser doppler flowmetry as an easy and useful physiological index. The purposes of this study were to estimate the relation between the oscillation and autonomic nervous activity and we tried to evaluate that the oscillation can distinguish similar mood states. 10 male subjects were induced to the two mood states (relaxed and bored) with audio visual and physical stimuli. Mood state of each subject was evaluated with the profile of mood states (POMS). The skin blood flow, ECG and electrogastrogram (EGG, main frequency 0.05Hz) were measured simultaneously. At the relaxed state, the oscillation and EGG were increased significantly than the resting condition (P<0.01). It was suggested that the oscillation was effected parasympathetic nerve activity. And we have found that relaxed and bored state was can be distinguished with combined the oscillation, HR variability and EGG.