The main purpose of this study is to apply the mechanism of human weight perception to multimedia applications. When a start and the goal points are given in the human motion, the velocity profile has an unimodal profile including the acceleration and deceleration zones. In such case, it is widely said that the motion control becomes more accurate in the deceleration zone for the final approach. Hence, it is assumed that the sensing ability also improves. This study challenges to confirm the hypothesis with weight stimuli generated by a force display device. As a preliminary experiment, this study confirms that our device enables the evaluation of human perception by tracing Weber's experiment in virtual reality; the obtained difference threshold (DL: Differenz Limen) almost agrees with the previous results. The difference threshold is a very important factor, which means perceptual threshold for weight changes. We further attempt to clarify the mechanism of the human weight perception for sudden weight changes during the lifting process. Based on individual lifting profiles, this study suddenly changes the load force in the two zones, and examines the difference thresholds of each subject. The results demonstrate that the human weight perception tends to become more sensitive in the deceleration zone during the lifting process. These results also imply the effectiveness of force display devices for physical experiments.

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This paper demonstrates human weight perception fbr sudden weight changes during a l 而 ng proccss ． ［ t iswell known that human motion has an unimodal velocity protlle including the acceleration and deceleration zones in a rcaching task ， which has a start and the goal points 、 This study attempts to reveal the difference of human weight porceptions between two zoncs by giving some magnitUdes ofweight changes with a force display device ； especially ， we investigate the difference threshold ( DL ； Diffcrenz Limcn ) in thc wcight pcrccption ， Thc results show that human weigh perception tends to become more sensitive in tlle deceleration zone ， Further ， this paper g ． hows thc cffectiveness ofvirtual real 重 ty teclmologies tbr physical experiments ．

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