Language disorders
| Aphasia |
| Aphasia is a defect or loss of language function in which the comprehension or expression of words (or nonverbal equivalents of words) is impaired as a result of injury to or degeneration of the language centers in the cerebral cortex. Aphasia is condition characterized by either partial or total loss of the ability to communicate verbally or using written words. |
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| Dysarthria |
| Dysarthria is an acquired neurological disorder of speech caused by damage to cranial nerves or the frontal lobe. Dysarthria is a disorder caused by paralysis, weakness, or inability to coordinate the muscles of the mouth. Dysarthria can occur as a developmental disability. It may be a sign of a neuromuscular disorder such cerebral palsy or Parkinson disease. Dysarthria is the second most common speech disorder among elderly patients. |
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| Mutism |
| Mutism is the inability or unwillingness to speak. A person who is mute cannot or does not care to talk. Someone who was mute was said to be dumb, not in the sense of being stupid, but in the sense of being devoid of the power of speech. Mutism is a rare childhood condition characterized by a consistent failure to speak in situations where talking is expected. This condition is most common in children under age 5. |
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| Stuttering |
| Stuttering is a complex set of behaviours that may involve repeating sounds, syllables or words, prolonging sounds, blocking or hesitating, and avoiding or substituting words. Stuttering is a speech disorder in which pronunciation of the (usually) first letter or syllable of a word is repeated involuntarily. Stuttering, especially in adults, can be accompanied by emotional embarrassment, distress and frustration. |
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