Brain tumors, strokes, head injuries, and other misfortunes often produce brain damage in people. Psychologists have found many major insights about brain-behavior relations by observing the behavioral changes in people who have suffered damage in specific brain areas. This research is limited because there are not many subjects and it is often difficult to determine the exact location and the severity of subjects' brain damage. Lesioning and electrical stimulation of the brain are two modern brain-imaging methods that have improved neuroscientists' ability to pinpoint the location of subjects' brain damage.Scientists sometimes observe what happens when specific brain structures in animals are purposely disabled. Lesioning is a method that injures or destroys a piece of the brain tissue. Scientists use a device called stereotaxic instrument to implant electrodes at precise brain locations.
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