People who have suffered a stroke or traumatic brain injury usually have to re-learn a lot – walking, writing, understanding, controlling their limbs, and speaking. After a stroke, speech is often at least affected, if not completely gone, depending on the severity of the infarct and on which side of the brain it occurred. In right-handed people, the left hemisphere of the brain controls the right side of the body, as well as the speech center; in left-handed people, the speech center is on the right side.
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