Predicting precision grip grasp locations on three-dimensional objects
Fig 2
Setup and stimuli for Experiments 1 and 2.
(a) Experimental setup. Seated participants performed grasping movements with their right hand. Following an auditory signal (coinciding with the shutter window turning transparent) they moved from one of the starting positions to the object and grasped it with a precision grip. They transported and released the object at the goal position and returned to the start position. (b) In Experiment 1 we employed four objects made of wooden cubes. Each object had a unique shape (that here we name L, U, S, V) and was presented at one of two different orientations with respect to the participant. (c) In Experiment 2 the objects had the same shapes as in Experiment 1, but now were made of wood and brass cubes. The brass and wood cubes were organized either in an alternate pattern (middle), so that the CoM of the object would remain approximately the same as for the wooden object, or grouped so that the CoM would be shifted either closer to (right) or away from (left) the participant’s hand starting location.