CONFERENCE (INTERNATIONAL) Touch Pointing Performance for Uncertain Touchable Sizes of 1D Targets

Hiroki Usuba*, Shota Yamanaka, Homei Miyashita* (* Meiji University)

21st International Conference on Human-Computer Interaction with Mobile Devices and Services (MobileHCI 2019)

October 14, 2019

When users operate smartphones and desktop interfaces with their fingers, there are differences between the motor and visual widths. For example, when a user selects an item from a vertical menu, the area that is physically touched by the user is often larger than the visual width (e.g., of the label for the item selected). Therefore, the user aims for the label assuming that the label width (the visual width) means the motor width. Consequently, the user performs operations more carefully than necessary. We conducted an experiment to investigate the effect of the motor and visual widths on finger pointing. After asking participants to explore the motor width, they performed an experimental task. Our experiment shows that the users' movement time depends on the motor width and can be predicted. We also analyze existing interfaces and discuss the implications