Journal of the Ergonomics Society of Korea (대한인간공학회지)

Ergonomics Society of Korea (대한인간공학회)
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A Study on Evaluation of Human Arousal Level using PPG Analysis

PPG(Photoplethysmography)분석을 이용한 각성도 평가에 관한 연구

  • Kim, Chi-Jung (Department of Computer Science, Sangmyung University) ;
  • Whang, Min-Cheol (Department of Digital Media, Sangmyung University) ;
  • Kim, Jong-Hwa (Department of Emotion Engineering, Sangmyung University) ;
  • Woo, Jin-Cheol (Culture Technology Institute, Sangmyung University) ;
  • Kim, Yong-Woo (Department of Computer Science, Sangmyung University) ;
  • Kim, Ji-Hye (Department of Computer Science, Sangmyung University)
  • 김치중 (상명대학교 컴퓨터과학과) ;
  • 황민철 (상명대학교 디지털미디어학부) ;
  • 김종화 (상명대학교 감성공학과) ;
  • 우진철 (상명대학교 문화컨텐츠 기술 연구소) ;
  • 김용우 (상명대학교 컴퓨터과학과) ;
  • 김지혜 (상명대학교 컴퓨터과학과)
  • Received : 2010.02.20
  • Accepted : 2010.02.25
  • Published : 2010.02.28
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Abstract

This research is to evaluate the arousal level by using cardiovascular response. PPG was used in this study as one of the method of measuring it rather than ECG (Electrocardiography) for the purpose of solving ergonomic problem of sensing. The participants were in the age group of 20 (mean=24, standard deviation=1.25): five men and five women. Each experiment composed with four identical sets. First, a black screen was displayed for 30 second rest. Then, the prepared 6 pair images were randomly presented for 10 second stimulation and for 30 second non-stimulation. PPG was measured on the earlobes of experimenters at 200Hz sampling frequency. PPG amplitude, PPI(Pulse to Pulse Interval), and PRV(Pulse Rate Variability) were analyzed according to arousal level. T-test was performed to compare between the PPG variables of rest and relaxation, rest and arousal, and relaxation and arousal. Relative to the rest state, PPG amplitude decreased in relaxed state and increased in aroused state. Relative to the rest state, PPI decreased in both emotional states. However, more significant decline was observed in aroused state. PRV's LF and HF were used in the form of LF/HF to compare between the relaxed and the aroused state. Therefore, PPG signal showed significant differences between relaxed and aroused state. In conclusion, evaluation of human arousal level used in the PPG analysis demonstrated that PPG has better usability and comforter measurement than ECG and is clearly an alternative method of measuring arousal level.

Keywords

References

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