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Vibration feedback is common in everyday devices, from virtual realitysystems to smartphones. However, cognitive and physical activities may impedeour ability to sense vibrations from devices. In this study, we develop andcharacterize a smartphone platform to investigate how a shape-memory task(cognitive activity) and walking (physical activity) impair human perception ofsmartphone vibrations. We measured how Apple's Core Haptics Frameworkparameters can be used for haptics research, namely how hapticIntensitymodulates amplitudes of 230 Hz vibrations. A 23-person user study found thatphysical (p<0.001) and cognitive (p=0.004) activity increase vibrationperception thresholds. Cognitive activity also increases vibration responsetime (p<0.001). This work also introduces a smartphone platform that can beused for out-of-lab vibration perception testing. Researchers can use oursmartphone platform and results to design better haptic devices for diverse,unique populations.

Cognitive and Physical Activities Impair Perception of Smartphone Vibrations