The discrete cursor movement is caused by the malfunctions of the cursor emulation software and hardware, typically with handheld pointing devices. The predicted trajectory of the discrete cursor movement is based on the users’ intension, thus, although the cursor could eventually reach the visual target on the screen, the physical body movement of the user might need to be adjusted frequently, which might increase total movement time and the amplitudes of visual cursor movement, and impact the physical body movement consequently. The aims of this research are to investigate the effects of the discrete cursor movement on the human performance based on the comparison made with the both versions of the working model, in turn to validate that there is a relation among the discrete cursor movement, the joint ROMs and the discomfort in particular body regions. Two versions of the working model were designed based on the pre-/post-experiment design case study. In the pre-test, the engineering working model V1 was tested with one hundred participants. In the post-test, the engineering working model V2 was tested with forty-three participants randomly selected from the same population. The result suggests that the tile-base gesture interfaces having discrete cursor movement (i.e. V1) can increase both elbow and wrist joint ROMs which depart from the neutral posture. It is further suggested that a market survey and more user studies need to be done in the future in order to specify the detailed requirements of the future gesture interface for the point-and-click task, in particular for the development of a novel button activation method for a hands-free interactive gesture system.
Keywords: Fitts’ law; ISO 9241; Usability; Gesture interface design
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