A statistical summary representation (SSR) is a phenomenon wherein a target property (e.g., size) is encoded based on the average of the stimulus-set to which it belongs. Here, I examined method of adjustment (MoA), visually and memory-guided grasping tasks in separate blocks in which differently sized targets (i.e., 20 30 and 40 mm) were presented with equal frequency (control weighing condition) and when the 20 mm and 40 mm targets were asymmetrically presented (i.e., small-target and large-target weighting conditions). The weighting conditions were used to determine whether the different tasks are influenced by an SSR. In the MoA task, responses for the small- and large-target weighting conditions were biased in the direction of the most frequently presented target in the stimulus-set. In contrast, grip apertures for visually and memory-guided grasps were refractory to the different weighting conditions. Accordingly, an SSR influences perceptions but not goal-directed grasping
