Abstract
Previous studies demonstrated that observing hand aperture modulates observer's attention to the object that is congruent with its action goal. In this study we investigated whether the concrete tool also modulates the observer's attention. On a simple detection task, pictures of two objects (small and large object) and a hand or a tool were presented on a screen. Then, a target stimulus was presented either over the small object or over the large object. Before the target onset, the hand or the tool were shown in either a precision grip (to grasp the small object) or a power grip (to grasp the large object) as a cue of presenting target. Result showed that the hand aperture facilitate target detection following short delay whereas the tool aperture does not have such effect. This result suggests that especially hand posture may have a role of visual processing in action prediction.
