Predicting precision grip grasp locations on three-dimensional objects
Fig 3
(a) Human grasps from Experiment 1. Grasps are represented as thumb (red triangles) and index finger (blue diamonds) contact positions, connected by dotted black lines. (b) Human grasps (blue blobs) for object U, orientation 2, when projected in a unitless 2D representation of the space of potential grasps, cluster around three distinct modes. (c) Distribution of thumb contact points on object L, orientation 2. Different colors represent grasps from different participants. (d) The level (%) of grasp similarity expected for grasps randomly distributed on the object surface (i.e. random combinations of thumb and index finger positioning attemptable on an object) and the observed level of between- and within-participant grasp similarity, averaged across objects and orientations. Error bars are 95% bootstrapped confidence intervals of the mean. ** p<0.01, *** p<0.001.