Gaze behaviour change around a 317-ms visual feedback delay during a simple block-copying task S Kamiya, T Yoshida |
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Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, Japan
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| The temporal delay between action and visual feedback is critical for self-body sensation regarding our natural body and any form of human-machine interaction. We examine how human behaviour and self-body usability changes when haptic feedback and visual feedback lose their spatiotemporal match, and how humans cope with this problem under a naturalistic situation. Participants performed a simple block-copying task “through” a delayed video image on a CRT display [Pelz et al, 2001, Experimental Brain Research, 139, 266-277]. Sense of ownership and agency were investigated to examine the usability and controllability of the hand shown on a visual display, as well as the visual image itself. As the delay increased, the reaction time increased. The distribution of fixation durations as well as questionnaire data revealed several qualitative changes before and after a 317-ms delay. These results suggest that participants changed their task strategy around this border value. Whether the change was due to the visual and tactile asynchrony around the gaze position, change in self-body sensation, or other factors is uncertain. Participants probably changed their strategy around this value to determine where to allocate attention: the hand in the display or their own hand. Their gaze behaviour reflected this change. |
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