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The Master Hand: A Study of the Origin and Meaning of Right and Left Sidedness and Its Relation to Personality and Language.

Am J Dis Child. 1947;74(3):389. doi:10.1001/archpedi.1947.02030010400020.
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In this monograph, the author, basing his conclusions on a critical analysis of available data, rejects the widely accepted hypothesis that handedness is an hereditary trait. Instead, he proposes that preferred laterality is a complicated, developmental trait with biologic endowment, learning experience, emotional reactions and social influence as prominent determining factors.

He explains the occurrence of left-handedness in 5 to 10 per cent of the population as due to: (1) an inherent deficiency, such as a physical defect in the right member enforcing the use of the left, or mental deficiency, (2) faulty education in the use of the hands and (3) emotional negativism.

Regarding the language centers, Blau proposes that cerebral dominance is determined by function. People are left-brained because they are right-handed, and the reverse is true of sinistrals.

Blau concludes that children should be encouraged in their early years to adopt right-handed habits. He believes that the


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The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
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