Turner syndrome in a pair of dizygotic twins: a single case study.

A pair of female dizygotic twins, one of whom had Turner syndrome (TS), was given a battery of psychological tasks. Results revealed that the TS twin showed deficits on tasks requiring spatial analyses, visual form discrimination, and visual memory. Differences in the serial recall characteristics on visual memory tasks were also noted. Results are discussed in terms of the reliability of the TS spatial deficit and the relationship between memory and spatial functioning.