Abstract
Merchandise and various services have been evaluated mainly by questionnaires. In addition to this rating, more objective assessment is recently required. However, it is extremely difficult to estimate what people feels or the psychological state of human beings. One possible method is to use electroencephalogram (EEG). We investigated the psychological responses to two kinds of sound stimuli (scary and soothing) by the Anterior Asymmetry and Emotion (AAE) and Comfort Vector (CV) models which are based on the prefrontal alpha wave, and the relation between their results were discussed. For the scary sound stimulus, subjects who showed greater withdrawal motivation (AAE) displayed a decreased pleasant state (CV), while subjects who showed higher approach motivation displayed opposite affective direction. There was a correlation between the AAE and CV models for the scary stimulus, but little correlation for the soothing stimulus. We suggest that joint consideration of these two models could lead to the multifaceted evaluation of a psychological state.
