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Trajectories of the “working” hand for novice (orange) and expert (purple) performers, collapsed across performance type (e.g., deceptive and veridical) and viewed from in “front” of the performer. All units are cm. The green sphere represents the position of the hand at the start. The spread of trajectories for the expert show a more economical set of trajectories, while the novice move a greater distance and has a characteristic arc not present in the expert's trajectory.
