カンファレンス (国際) Effect of Gaps with Penal Distractors Imposing Time Penalty in Touch-Pointing Tasks
The 20th International Conference on Human-Computer Interaction with Mobile Devices and Services (MobileHCI 2018)
Targets on touchscreens should be large enough so that they can be tapped by fingers. In addition to the size of a target, properties of unintended targets around the intended target (e.g., margins) could affect user performance. In this study, we investigate the negative effects of such unintended targets (or distractors), which impose a penalty time when tapped for which users have to wait. Our participants sometimes purposely tapped an empty space on the opposite side of the distractor to avoid tapping it, and such behavior was affected by (1) the size of the intended target, (2) gap between the intended target and distractors, and (3) dimensionality of pointing tasks (1D or 2D). We also found that we could not estimate user performance by using Fitts' and FFitts' laws, probably because tap positions tended to shift away from distractors.