A haptic error: Skew in a symmetrical curve

Symmetrically curved edges are often felt to be skewed, i.e., the highpoint feels off center. The direction of the skew depends on the direction of the hand’s scanning movement, the highpoint being felt to be towards the right when the hand scans in a left to right direction and towards the left when scanning right to left. The result clarifies some earlier studies and raises questions about relationships between the nature of the scanning movement and the quality of judgment.