Quantitative Analysis of Mental Effort Investment using Photoplethysmogram

Yongqiang Lyu, Tianshu Yang, Xiaomin Luo, Chun Yu, Lei Wang, Yuanchun Shi


Recent studies have shown a close relationship between the mental effort and the photoplethysmograms (PPG), but lack an index which can analyze the invested mental effort quantitatively during the cognitive tasks, which is notable for evaluating user experience in ubiquitous scenarios. In this study, we propose the stress-induced vascular response index (sVRI) to quantify the mental effort invested in cognitive tasks, and verify it via the experiments on aritehmatic tasks with different difficulty levels. The results show an outstanding correlation between the sVRI and the task difficulties, which suggests a dose-response of the sVRI when users perform different cognitive tasks with different difficulties. This is useful for evaluating the user experience in performing cognitive tasks to guide the task or the interaction designs.


  1. Allen, J., 2007. Photoplethysmography and its application in clinical physiological measurement. Physiological measurement, 28(3), p. R1.
  2. Alneab, M. E., Alobaid, N. & Seifalian, A. M., 2007. Optical techniques in the assessment of peripheral arterial disease. Current Vascular Pharmacology, 5(1), pp. 53-59.
  3. Award, A., 2001. "How Does the Plethysmogram Derived from the Pulse Oximeter Relate to Arterial Blood Pressure in Coronary Artery Bypass Graft Patients?". Anesth Anal, Volume 93, pp. 1466-1471.
  4. Collins, S. M., Karasek, R. A. & Costas, K., 2005. Job strain and autonomic indices of cardiovascular disease risk. American journal of industrial medicine, 48(3), pp. 182-193.
  5. Dedovic, K., Renwick, R. & Mahani, N. K., 2005. The Montreal Imaging Stress Task: using functional imaging to investigate the effects of perceiving and processing psychosocial stress in the human brain. Journal of Psychiatry and Neuroscience, 30(5), p. 319.
  6. Farooq, U., Jang, D. G. & Park, J. H., 2010. PPG delineator for real-time ubiquitous applications. In: Engineering in Medicine and Biology Society (EMBC), 2010 Annual International Conference of the IEEE. s.l.:IEEE, pp. 4582-4585.
  7. Goor, D. et al., 2004. Sheps DS. Peripheral arterial tonometry: a diagnostic method for detection of myocardial ischemia induced during mental stress tests: a pilot study. Clin Cardiol, Volume 27, pp. 137- 41.
  8. Harris, C. R., 2001. Cardiovascular responses of embarrassment and effects of emotional suppression in a social setting. Journal of personality and social psychology, 81(5), p. 886.
  9. Iani, C., Gopher, D. & Lvie, P., 2004. Effects of task difficulty and invested mental effort on peripheral vasoconstriction. Psychophysiology, 41(5), pp. 789- 798.
  10. Luo, L. et al., 2013. On psychological measurement and application of photoplethysmography. China Medical Equipment, 10(105), pp. 44-47.
  11. Luo, L., Xiao, L., Miao, D. & Luo, X., 2012. The relationship between mental stress induced changes in cortisol levels and vascular responses quantified by waveform analysis: investigating stress-dependent indices of vascular changes.. Proceedings of the 2012 International Conference on Biomedical Engineering and Biotechnology, Volume 2, pp. 929-933.
  12. Luo, X., Zhang, B., Hao, X. & Wang, X., 2011. Identification of Photoplethysmogram Appearance for Clinical Interpretation. proceedings of The World Congress on Engineering and Technology, Volume 7, pp. 442-445.
  13. Madelon, L. P. et al., 1998. Cardiovascular and endocrine responses to experimental stress: Effects of mental effort and controllability. Psychoneuroendocrinology, January, 23(1), pp. 1-17.
  14. Nilsson, L., Goscinski, T. & Lindenberger, M., 2010. Respiratory variations in the photoplethysmographic waveform: acute hypovolaemia during spontaneous breathing is not detected. Physiological mearurement, 31(7), p. 953.
  15. Rimmele, U., Zellweger, B. C. & Marti, B., 2007. Trained men show lower cortisol, heart rate and psychological responses to psychosocial stress compared with untrained men. Psychoneuroendocrinology, 32(6), pp. 627-635.
  16. Schmitz, C. H., Graber, H. L. & Barbour, R. L., 2006. Peripheral vascular noninvasive measurements [J]. Encyclopedia of Medical Devices and Instrumentation.
  17. Shelley, K. H. & Shelley, S., 2001. "Pulse Oximeter Waveform: Photoelectric Plethysmography.". In: Clinical Monitoring: Practical applications for anesthesia and critical care.. s.l.:s.n., pp. 420-428.
  18. Shin, W., Cha, Y. D. & Yoon, G., 2010. ECG/PPG integer signal processing for a ubiquitous health monitoring system. Journal of Medical systems, 34(5), pp. 891- 898.
  19. Vlachopoulos, C., Kosmopoulou, F. & Alexopoulos, N., 2006. Acute mental stress has a prolonged unfavorable effect on arterial stiffness and wave reflection. Psychosomatic medicine, 68(2), pp. 231-237.
  20. Xiao, L. et al., 2011. Assessment of Stress Reactions of Recruits Based on Quantitative analysis of the characteristics of fingertip Photoplethysmographic. Med J Chin, 1 Sep, 36(9), pp. 991-994.

Paper Citation

in Harvard Style

Lyu Y., Yang T., Luo X., Yu C., Wang L. and Shi Y. (2014). Quantitative Analysis of Mental Effort Investment using Photoplethysmogram . In Proceedings of the International Conference on Health Informatics - Volume 1: HEALTHINF, (BIOSTEC 2014) ISBN 978-989-758-010-9, pages 166-171. DOI: 10.5220/0004732001660171

in Bibtex Style

author={Yongqiang Lyu and Tianshu Yang and Xiaomin Luo and Chun Yu and Lei Wang and Yuanchun Shi},
title={Quantitative Analysis of Mental Effort Investment using Photoplethysmogram},
booktitle={Proceedings of the International Conference on Health Informatics - Volume 1: HEALTHINF, (BIOSTEC 2014)},

in EndNote Style

JO - Proceedings of the International Conference on Health Informatics - Volume 1: HEALTHINF, (BIOSTEC 2014)
TI - Quantitative Analysis of Mental Effort Investment using Photoplethysmogram
SN - 978-989-758-010-9
AU - Lyu Y.
AU - Yang T.
AU - Luo X.
AU - Yu C.
AU - Wang L.
AU - Shi Y.
PY - 2014
SP - 166
EP - 171
DO - 10.5220/0004732001660171