Proceedings of the KOSOMBE Conference (대한의용생체공학회:학술대회논문집)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Time-Frequency Analysis of EEGs Evoked by Tactile Stimulation

피부자극에 의해 유발되는 뇌파의 Time-Frequency 분석

  • Yeo, H.S. (Department of Biomedical Engineering, College of Health Sciences, Inje University) ;
  • Oh, S.H. (Department of Biomedical Engineering, College of Health Sciences, Inje University) ;
  • Im, J.J. (Department of Biomedical Engineering, College of Health Sciences, Inje University) ;
  • Sohn, J.H. (Department of Psychology, College of Social Science, Chungnam University)
  • 여형석 (인제대학교 보건대학 의용공학과) ;
  • 오상훈 (인제대학교 보건대학 의용공학과) ;
  • 임재중 (인제대학교 보건대학 의용공학과) ;
  • 손진훈 (충남대학교 사회과학대학 심리학과)
  • Published : 1996.11.15
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Abstract

This study was peformed to characterize the physiological signal prior to develop an algorithm which quantifies EEGs evoked by tactile stimulation. The experiment was devised with four experimental conditions, which were control and two levels of pressures in tactile sensation. Twenty subjects were used to obtain EEGs while applying tactile stimulation using two types of textiles, soft towel and sand paper, to the right hand of each subject. EEGs were acquired for 20 seconds, and each trial was repeated five times randomly at the different levels of stimulus intensities. The index, $S_{n}$, was obtained by calculating the ratio of energy distribution in the time-frequency plot for each scored psychological state of the subject. The results showed that dominant aspects of the EEG signals have their maximal frequencies concentrated at a lower ranges for the resting and pleasant state, while the spectral energies were distributed to higher frequency ranges when subjects experience an unpleasant emotion.

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