Chill-Out: Relaxation Training through Respiratory Biofeedback in a Mobile Casual Game

  • Avinash Parnandi
  • Beena Ahmed
  • Eva Shipp
  • Ricardo Gutierrez-Osuna
Part of the Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering book series (LNICST, volume 130)


We present Chill-Out, an adaptive biofeedback game that teaches relaxation skills by monitoring the breathing rate of the player. The game uses a positive feedback loop that penalizes fast breathing by means of a proportional-derivative control law: rapid (and/or increasing) breathing rates increase game difficulty and reduce the final score of the game. We evaluated Chill-Out against a conventional non-biofeedback game and traditional relaxation based on deep breathing. Measurements of breathing rate, electrodermal activity, and heart rate variability show that playing Chill-Out leads to lower arousal during a subsequent task designed to induce stress.


Heart Rate Variability Relaxation Training Deep Breathing Breathing Rate Electrodermal Activity 
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Copyright information

© ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering 2014

Authors and Affiliations

  • Avinash Parnandi
    • 1
  • Beena Ahmed
    • 2
  • Eva Shipp
    • 3
  • Ricardo Gutierrez-Osuna
    • 1
  1. 1.Department of Computer Science and EngineeringTexas A&M UniversityUSA
  2. 2.Department of Electrical and Computer EngineeringTexas A&M UniversityQatar
  3. 3.School of Rural and Public HealthTexas A&M Health Science CenterUSA

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