ABSTRACT
The suppliers usually desire to know how much the service satisfied customers. However, the reply from customers obtained by questionnaire survey, for example, is not always accurate to express honest mental activity. This paper describes a detecting method of a more accurate reply by entrusting mental and physical activities for the services to unconscious responses reflecting activities of autonomic nervous system during sleep. Some experiments were performed by well known services for healing, for example, in order to demonstrate accuracy of the present method. As a result, the unconscious responses reflecting the above nervous system such as respiration and pulse rate shifts beyond several hours at night showed satisfaction instead of conscious responses reflecting mental activities.
