Familial sinistrality and degree of left-handedness.
Hécaen & Sauguet (1970) reported that, according to a handedness inventory measure, familial sinistrality among left-handers (brain-damaged patients) was associated with weak left-handedness. We assessed the relationship of familial sinistrality and degree of left-handedness among 71 normal left-and 80 right-handed subjects. No general relationship of degree of left-handedness, defined by four handedness tasks, to familial sinistrality obtained. Only one of the tasks (finger tapping speed) significantly differed between familial and non-familial left-handers, the familial left-handers being more strongly left-handed on the task.
D003469:Culture; D005260:Female; D007839:Functional Laterality; D005823:Genetics; D006801:Humans; D008297:Male; D012737:Sex Factors; D013647:Task Performance and Analysis