This book contains the Thomas W. Salmon Memorial Lectures given at the Academy of Medicine in 1936 by Dr. Samuel Torrey Orton. In these lectures Dr. Orton presents the results of his research and studies in language disorders over a period of more than ten years. In the first chapter certain disturbances of language which follow injury to the brain in the adult are briefly reviewed and attention is called to the arresting fact that these disorders may follow a lesion in one hemisphere of the brain but only if it is the master half of the brain that is injured. The author further points out that our only guide to the master hemisphere in the adult is his laterality, and observations in children are reported which indicate a wide range of variability in establishing a clear cut laterality as measured by tests and history of development of handedness, eyedness
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A 1937 study studied this question.