Hand preference in psychotic twins.
In an attempt to replicate the influential study of Boklage (1977), hand preference for writing was examined in a new series of 30 monozygotic (MZ) and 30 dizygotic (DZ) twin pairs in whom the proband had suffered a functional psychosis. In contrast to the original report, no increased rate of left-handedness was found in MZ compared to DZ twins, or psychotic compared with nonpsychotic twins. In particular, no relationship between within-pair left-handedness and discordance for psychosis emerged. Possible reasons for the disagreement between the two studies are examined.
Lewis
S W
SW
Institute of Psychiatry, London, England.
Chitkara
B
B
Reveley
A M
AM
D000328:Adult; D000341:Affective Disorders, Psychotic / Q000235:genetics; D001714:Bipolar Disorder / Q000235:genetics; D004292:Dominance, Cerebral; D007839:Functional Laterality; D006801:Humans; D008297:Male; D011618:Psychotic Disorders / Q000235:genetics*; D012559:Schizophrenia / Q000235:genetics; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic