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Aphasia can take different forms, corresponding with the area of brain injury. The symptoms that have just been described previously are features of some common varieties of aphasia.
Global Aphasia
This is the most severe form of aphasia in which all four modalities are affected. People with glovbal aphasia may be able to utter only a few words, usually stereotypic utterances. They may barely, or not at all, understand spoken or written words, and are unable to read or write. Usually, at the onset of brain injury, the person may appear to have global aphasia only to develop, later on, a less sevbere form of aphasia, depending on the extent of brain damage. With greater brain injury, the language problem may be more permanent.
Broca's aphasia
It is a form of aphasia which is often referred to as "non-fluent". Impairment lies in the access to vocabulary so that the person's verbal output is marked by telegraphic speech or agrammatism. Pronunciation is often difficult and clumsy. Auditory comprehension, however, may be intact. Broca's aphasia is usually accompanied by right-sided body
weakness.
Wernickes's aphasia
This is a type of aphasia wherein the impairment lies in grasping word meanings. Auditory comprehension, therefore, is very poor. The person may speak easily and fluently but his utterances usually contain an abundance of paraphasias, unrelated words (called "word salad" or "jargon") or even invented words. Oftentimes the person shows a lack of awareness of the problem.
Anomic aphasia
A person with anomic aphasia has good comprehension and fluent, grammatically correct utterances marked by word-retrieval difficulties. He has persistent difficulty in finding exact words he wants. Consequently his speech is marked by circumlocutions.
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