Investigation of Galvanic Test --Analysis of Galvanic Body-Sway using with Medical Data Processing Computer--

The purposes of this investigation ore to observe the body-sway induced by galvanic stimulation, and to analyse them using a medical data processing computer for detection of abnormal galvanic response in thedesequilibrium. The electric stimulation was delivered by anodal unipolar and double electrodes. Body-sway responses were recorded with two accelerometers fixed on the top of helmet, one for transverse and other for sagittal plane. Signals from the accelerometers were analysed using with a medical data processing computer, designing for calculating averages. This paper reported the data from 40 healthy subjects examined. The latent period till body-sway began after closing the electric circuit was 0.2-0.5 sec., in both sexes. Pttern of body-sway of subjects during the electric stimulation were classified in three types. With unipolar stimulstion, there was not a case in which the head deviated toward the nonstimulation side. ”Intial Wave” was observed in 33 subjects. In contraty, the double electrode test showed no regularity of sway in the transverse and sagittal plane.