Influence of Longterm Duration and Damping Shapes to Perceived Intensity for Vibrotactile Stimulation

Haptic information has been shown to improve various experiences and accuracy of movement. However, the perceived intensity is known to be influenced by various parameters of the vibrotactile stimuli. Not only the amplitude but also the length of a short-term duration, the presence of a decaying factor, and the shape of the waveform affect the subjective intensity. In this paper, we investigated the influence of different damping shapes and duration on the perceived intensity. We prepared four different shaped waves as stimuli; a constant sinusoidal wave, an exponential decaying shaped wave, a linear decaying shaped wave, and a logarithmic decaying shaped wave, and six different long-term durations of up to 3 seconds for each waveform. Ten participants took part in the experiment to see how strong the intensity was perceived for each stimulus. The results indicated that the damping shape of the samples affects the perceived intensity in the order of a constant sinusoidal wave, a logarithmic decaying shaped wave, a linear decaying shaped wave, and an exponential decaying shaped wave. Also, the results suggest the representation of the time-averaged energy to the perceived intensity.