Figure 1. Exemplars of Human-Computer Integration: extending the body with additional robotic arms; [70] embedding computation into the body using electric muscle stimulation to manipulate handwriting [48]; and, a tail extension controlled by body movements [86].

Figure 1: We found that preserving the user's agency while they are accelerated using a haptic device, such as electrical muscle stimulation (EMS), is key to retaining a faster reaction time afer removing the haptic device. In our study, we used EMS to accelerate participants as they pressed a button when they saw an LED fash (inspired by taking a photo of a target).

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In this paper, we introduce a wearable stimulation device that is capable of simultaneously achieving functional electrical stimulation (FES) and the measurement of electromyogram (EMG) signals. We also propose dynamically adjustable frequency stimulation over a wide range of frequencies (1-150Hz), which allows the EMG-triggered FES device to be used in various scenarios. The developed prototype can be used not only as social playware for facilitating touch communications but also as a tool for virtual experiences such as hand tremors in Parkinson's disease, and an assistive tool for sports training. The methodology, preliminarily experiments, and potential applications are described in this paper.