Dichhaptic recognition of shapes and letters in children.

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Abstract
Previous investigations of tactual asymmetry have generally used long presentation times and few have controlled responding order. Dichhaptic presentation of letters and nonsense shapes, a 2-s exposure time and a controlled order of response were used to investigate tactual asymmetry in children. Nonsense shapes showed a significant left-hand superiority; letters showed no consistent hand differences, suggesting that right hemisphere involvement is greater in the shapes task. No consistent age effects were found. The only significant sex differences involved a trend towards a greater left-hand (right hemisphere) effect for boys than for girls on the shapes.