Grasp Point of an Object is Switched between Central and Peripheral Visual Field Conditions

The purpose of this study is to investigate whether grasp point of each target object is switched between central and peripheral visual field conditions. We measured grasp points of a lift-up task (LT) and a pinch task (PT), that did not lift from a table, under the three visual field conditions. As a result, in the normal condition, the grasp points of LT and PT were different and the grasp points of LT were almost the centers of gravity of objects. While, the grasp points of LT were switched to those of PT under the central visual field condition and the grasp points of PT were switched to those of LT under the peripheral visual field condition. These results indicate that in the human brain there are at least two types of grasp point computation and the central and peripheral vision systems respectively contribute to these computations of PT and LT.