| Summary: | 碩士 === 國立臺灣大學 === 資訊工程學研究所 === 106 === Due to the environmental factors, humans'' visual or acoustical channels may be overloaded or inaccessible for the conveyance of information. Haptic feedback, however, can convey the information through an alternative to visual and acoustical feedback in the complex environmental situation with an unobtrusive and intuitive way. In this thesis, we design a device of two vibrotactile wristbands, which can achieve high-resolution spatial guidance using sparse vibrators, and report a controlled lab experiment to investigate the effective distance (4, 6, or 8cm) and the direction feedback (point stimulus or motion feedback). Thirty-six participants are involved in the experiment. The results show that there are statistically significant differences between two direction feedbacks in the distance of 4cm and 6cm. According to these results, using motion feedback in 4cm and 6cm may be more suitable when receiving directional vibration patterns on the wrist compared with only point stimulus. In the next step, we design a crossmodal guidance system using visual and tactile perception to facilitate the process of haptic guidance. As the vibration synchronized with the lighting pulse, users can search for the target location according to the crossmodal cues. In this experiment, we investigate the least temporal difference, which users can determine by the concurred wrist vibration, between two lighting pulses. A just-noticeable difference (JND) study is conducted in three different conditions of lighting pulses (Near, Far, and Cognitive load condition). The results of JND study are reported in the thesis.
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