Hand posture in writing: possible artifacts from self report.
Seven hundred forty undergraduate students were asked to report the hand posture they used during writing and the presence or absence of left-handedness in the immediate family. Drawings were provided of prototypical "normal" and "inverted" posture and subjects were also given the option of reporting that their hand posture was somewhere between the two illustrated positions. The incidence of reporting "between" was 17% for left-handers and 46% for right-handers. These results suggest that experimenters should exercise caution when categorizing subjects on the basis of self-report forms that include only two choices: normal posture and inverted posture.
D000328:Adult; D005260:Female; D007839:Functional Laterality; D006236:Handwriting; D006801:Humans; D008297:Male; D010641:Phenotype; D011187:Posture