Electroencephalogram changes according to the subjective acupuncture sensation.

Abstract Objectives: The aim of this study was to investigate electroencephalogram changes, the electrical activity measured on the scalp, in relation to the items of acupuncture sensation questionnaire, based on real-life patients' experiences during acupuncture. Methods: Using a 32 channel digital electroencephalogram system, healthy volunteers (n=10) received electroencephalogram examinations over four consecutive periods: (1) baseline; (2 and 3) acupuncture needle retention only or needle retention plus manipulation in random order; (4) aftermath. Alpha, beta and theta band power of electroencephalogram acquired in 30 electrodes were analysed in relation to the higher or lower subjective rating of acupuncture sensation questionnaire categories: the needle insertion, manipulation and retention related items. Results: The group with higher ratings of needle retention related questionnaire items showed significant changes in alpha band electroencephalogram powers over the periods before, during and after...