The development of left-hand superiority for discriminating braille configurations.

Discrimination of braille configurations was performed better by the left hand of right-handed sighted children over age 10, paralleling a previous study in which the names of braille letters were learned. Left-hand superiority occurred sooner in males, but they were not better at the task than females, more of whom maintained a left-hand advantage as adults. As in vision, configurations differing in orientation were more difficult to discriminate than those differing in number or displacement, but this order of difficulty was the same for both hands.