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

翻译：振动反馈普遍存在于从虚拟现实系统到智能手机等日常设备中。然而，认知活动和身体活动可能阻碍我们感知设备振动的能力。本研究开发并表征了一个智能手机平台，用于探究形状记忆任务（认知活动）和行走（身体活动）如何损害人类对智能手机振动的感知。我们测量了苹果核心触觉框架参数在触觉研究中的应用方式，特别是触觉强度如何调制230 Hz振动的振幅。一项23人用户研究发现，身体活动（p<0.001）和认知活动（p=0.004）均会提高振动感知阈值，且认知活动还会延长振动响应时间（p<0.001）。本工作还引入了一种可用于实验室外振动感知测试的智能手机平台。研究人员可利用我们开发的智能手机平台及研究结果，为不同特殊人群设计更优的触觉设备。