Measuring touch bias of one thumb posture on direct touch-based mobile devices

Direct-touch interactive surfaces become pervasive in our daily lives due to personal mobile devices such as smartphones. However, inaccurate target pointing on direct touch-based mobile devices, which occurs due to the ambiguity of the user-aimed point estimation from the finger contact region, often causes trouble for users. To understand this problem of direct-touch interactions, we conducted an experimental study where we explored the touch bias of one thumb posture on direct touch-based mobile devices. Moreover, we proposed a novel method of splitting a touch surface into several regions; this method enables an analysis of the touch bias according to angular and longitudinal criteria.