Improving Haptic Feedback on Wearable Devices through Accelerometer Measurements
summary
Measures wrist motion just before a vibration and shows that prior acceleration improves prediction of perception compared to intensity, duration and age alone. Study uses a Pebble smartwatch with a 50 Hz accelerometer, four stimulus types (100/200 ms, 2/10 or 4/10 PWM intensity), 7 participants and over 3,000+ stimuli, and fits logistic regression and ROC classifiers; adding prior acceleration raises classification performance, enabling lower-power or adaptive haptic alerts and more consistent perceived intensity across activities.
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