1. A Cyber-Physical Recommender Systems to Discover SmartPhone Exergame Enjoyment (CyPReSS)
Prof Emmanuel Agu
Prof Mark Claypool
Computer Science Dept.
Worcester Polytechnic Institute (WPI)

2. CyPRESS Problem: Physical inactivity leading cause of death in US:
Causes obesity, increases risk of many ailments
Many young adults get insufficient exercise
Choose to use Internet, smartphone, social media, games)

3. Exergames
Exergames may help increase physical activity in young people
Definition: Exergames gamify physical activity
Demonstrated efficacy in improving health (aerobic fitness, etc)

4. The Specific Problem Exergame engagement initially high, drops quickly
95% of all new exergamers stopped playing within 3 months
85% of new players stopped after one day!
CyPRESS: cyber-physical smartphone-based recommender system
Automatically detects waning user interest, recommends similar games

5. CyPRESS Overview
Smartphone Game enjoyment inferred autonomously from player behaviors
Excitement when playing (smartphone accelerometer, gyroscope)
Game replay frequency (session statistics)
Increased step count (indicates user engagement especially useful for pedometer games)

6. Cypress Objectives
Actively monitoring player behaviors that indicate game enjoyment
Learns types of game each player likes (autonomously using machine learning)
Recommends similar games when player engagement drops