Pathological left-handedness: is it familial?
Hand preferences and the incidence of familial sinistrality of developmentally retarded. Down's syndrome and non-retarded individuals were compared. The incidence of left-handedness in the retarded groups was higher than in the normal group. The incidence of familial left-handedness was also raised in the retarded groups. These results are inconsistent with the popular theoretical distinction between pathological left-handedness in special groups and familial left-handedness in the general population.
D000293:Adolescent; D000328:Adult; D002648:Child; D004314:Down Syndrome / Q000503:physiopathology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008607:Intellectual Disability / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged