Brain damage and what it can tell us

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The first real evidence about localization of function in the brain comes from the study of people with brain injuries. One famous patient was Phineas P. Gage, whose injury changed his personality. With the patient’s severe speech disorder, physiologist Paul Broca carried out several studies which showed that if you damaged the right side of someone’s brain, they were likely to lose their ability to speak. These findings led to the discovery of Broca’s area, where we find the language centers in our brains today. Carl Wernicke also discovered the area associated with language comprehension. More recently, while studying epilepsy patients, Roger Sperry found that the two sides of the brain process information differently. The left hemisphere controls logic, while the right deals with creativity. Research by Karl Lashly has shown that if a part of the brain becomes damaged, other areas can compensate.

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