The tow cerebral hemispheres are identical in appearance. However, ever since Broca discov- ered in 1861 that left hemisphere damage results in 'expressive' aphasia, neuroscientists have realized that the brain is functionally asymmetrical (Ornstein, 1997). A few years later, Wernicke identified that left hemisphere damage leads to 'receptive' aphasia. As a result, neuroscientists held the belief that the left hem- isphere was superior to the fight because it was the language centre, and thus the seat of reason and intellect.
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