A study of haptic perception when using a mobile device

Argument focusing on the influence of arm directions

Abstract

In recent years, the situations related to the use of various devices, human posture using a device, has greatly changed from static to dynamic one (e. g. walking), for the downsizing of devices and the developing of the network infrastructure. It has been demanded that the study on relation usability of downsizing devices between tactual perception, because most of the devices are operated with the fingertip under the dynamic situations of using devices. As there is the finger at the tip of the arm on the human skeleton, it considers that the fingertip direction by comparison with sagittal-horizontal axis changes under the range of motion of arm in response to situations of using device. For these reasons, it expects that the influence of the arm directions become an important factor in relation to usability of mobile device operated mainly with the fingertip. Therefore, the purpose of this study is improving usability of mobile device affected by the arm directions (combination of shoulder rotations and elbow flexions). Considering the effect of the relationship between arm directions and tactual peculiarity, the difficulty of human using tactual perception was investigated from each index (correctness, cognition time (the time touching a test piece by the fingertip), introspection and difficulty of a haptic perception). Moreover, graph of TaDAD, an innovative graph, was comprehendly showed the relationship between arm directions and tactual peculiarity.