Portfolio

Stress measurement

The objective of this work is to develop a minimally-obtrusive wearable sensor for monitoring mental stress in ambulatory settings. The system consists of a network of wireless sensors (skin conductance, respiration, heart rate, muscle activity) and a holster unit housing a MCU and additional sensors (GPS, acceleration). The figure shows a user wearing the system; in this case the chest strap is shown above the clothing for illustration purposes, but measures of heart rate require contact with the skin.

Experimental results are shown in the figure below in terms of the electrodermal activity (i.e., changes in skin conductance) under a mental stressor (e.g., a computer game). Prior to the stressor, the subject was asked to rest quietly in a sitting position. As a result, the skin conductance level (SCL) slowly decays, which is an indication of relaxation. The SCL remains low early in the game, but eventually increases as the game becomes more challenging. In addition to an increase in SCLs, the figure shows a number of transients peaks, known as skin conductance responses (SCRs), which are also indicative of stress (e.g. startle events).

In the process of developing and evaluating the system, we are also investigating system identification methods (e.g., autoregressive models, Volterra series) to decouple sympathetic and parasympathetic contributions as well as respiratory effects on heart rate variability.

Relevant publications

Z. Wang, A. Parnandi, R. Gutierrez-Osuna

BioPad: Leveraging off-the-Shelf Video Games for Stress Self-Regulation (Article)

IEEE Journal of Biomedical and Health Informatics, in press, 2017.

(BibTeX)

A. Parnandi, R. Gutierrez-Osuna

Physiological modalities for relaxation skill transfer in biofeedback games (Article)

Journal of Biomedical and Health Informatics, in press, 2016.

(Links | BibTeX)

B. Ahmed, H. Ali, J. Choi, R. Gutierrez-Osuna

ReBreathe: A calibration protocol that improves stress/relax classification by relabeling deep breathing relaxation exercises (Article)

IEEE Transactions on Affective Computing, in press, 2015.

(Links | BibTeX)

R. Bhandari, A. Parnandi, E. Shipp, B. Ahmed, R. Gutierrez-Osuna

Music-based respiratory biofeedback in visually-demanding tasks (Inproceeding)

15th International Conference on New Interfaces for Musical Expression (NIME), 2015.

(Links | BibTeX)

R. Al-Rihawi, B. Ahmed,, R. Gutierrez-Osuna

Dodging Stress With A Personalized Biofeedback Game (Inproceeding)

Proc. CHI-PLAY, 2014.

(Links | BibTeX)

J. Harris, S. Vance, O. Fernandes, A. Parnandi, R. Gutierrez-Osuna

Sonic Respiration: Controlling Respiration Rate Through Auditory Biofeedback (Inproceeding)

Proc. ACM CHI Conference on Human Factors in Computing Systems (CHI 2014) Works-in-Progress, 2014.

(Links | BibTeX)

Avinash Parnandi, Beena Ahmed, Eva Shipp, Ricardo Gutierrez-Osuna

Chill-Out: Relaxation training through respiratory biofeedback in a mobile casual game (Conference)

Fifth International Conference on Mobile Computing, Applications and Services (MobiCASE 2013), 2013.

(Links | BibTeX)

A. Parnandi, Y. Son, R. Gutierrez-Osuna

A Control-Theoretic Approach to Adaptive Physiological Games (Conference)

Humaine Association Conference on Affective Computing and Intelligent Interaction (ACII), 2013.

(Links | BibTeX)

H. Khan, B. Ahmed, J. Choi, R. Gutierrez-Osuna

Using an Ambulatory Stress Monitoring Device to Identify Relaxation Due to Untrained Deep Breathing (Conference)

35th Annual International Conference of the IEEE Engineering in Medicine & Biology Society, 2013.

(Abstract | Links | BibTeX)

A. Parnandi , R. Gutierrez-Osuna

Contactless Measurement of Heart Rate Variability from Pupillary Fluctuations (Techreport)

2012.

(Abstract | Links | BibTeX)

Y. Son, A. Parnandi, R. Gutierrez-Osuna

A Control-Theoretic Approach to Adaptive Physiological Games (Techreport)

2012.

(Abstract | Links | BibTeX)

K. Masood, J. Choi*, B. Ahmed,, R. Gutierrez-Osuna

Consistency and Validity of Self-reporting Scores in Stress Measurement Surveys (Conference)

2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2012.

(Abstract | Links | BibTeX)

F. Alamudun, J. Choi, R. Gutierrez-Osuna, H. Khan, B. Ahmed

Removal of Subject-Dependent and Activity-Dependent Variation in Physiological Measures of Stress (Conference)

Proceedings of Pervasive Computing Technologies for Healthcare, 2012, ISBN: 978-1-936968-43-5.

(Abstract | Links | BibTeX)

J. Choi, B. Ahmed, R. Gutierrez-Osuna

Development and Evaluation of an Ambulatory Stress Monitor Based on Wearable Sensors (Article)

IEEE Transactions on Information Technology in Biomedicine, 99, Page(s): 279 – 286, 2012.

(Abstract | Links | BibTeX)

J. Choi, R. Gutierrez-Osuna

Removal of respiratory influences from heart rate variability in stress monitoring (Article)

IEEE Sensors Journal, 11, 11, Page(s): 2649-2656, 2011.

(Abstract | Links | BibTeX)

F. Shipman, S.I. Park, R. Gutierrez-Osuna, J. Choi

PerCon: Supporting the Management and Reuse of Wearable Sensor Data (Techreport)

2011.

(Abstract | Links | BibTeX)

J. Choi, B. Ahmed, R. Gutierrez-Osuna

Ambulatory Stress Monitoring with Minimally-Invasive Wearable Sensors (Techreport)

2010.

(Abstract | Links | BibTeX)

J. Choi, R. Gutierrez-Osuna

Estimating mental stress using a wearable cardio-respiratory sensor (Conference)

Proceedings of IEEE Sensors, 2010.

(Abstract | Links | BibTeX)

J. Choi, R. Gutierrez-Osuna

Using heart rate monitors to detect mental stress (Conference)

Sixth International Workshop on Wearable and Implantable Body Sensor Networks , 2009.

(Abstract | Links | BibTeX)

J. Choi, R. Gutierrez-Osuna

Estimating the principal dynamic modes of autonomic state with wearable sensors (Techreport)

2008.

(Abstract | Links | BibTeX)