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In aphasia (sometimes called dysphasia), [a] a person may be unable to comprehend or unable to formulate language because of damage to specific brain regions. [2] The major causes are stroke and head trauma; prevalence is hard to determine, but aphasia due to stroke is estimated to be 0.1–0.4% in the Global North. [3]
Patients diagnosed with Wernicke's aphasia can show severe language comprehension deficits; however, this is dependent on the severity and extent of the lesion. [2] Severity levels may range from being unable to understand even the simplest spoken and/or written information to missing minor details of a conversation. [2]
Expressive aphasia contrasts with receptive aphasia, in which patients are able to speak in grammatical sentences that lack semantic significance and generally also have trouble with comprehension. [ 3 ] [ 7 ] Expressive aphasia differs from dysarthria , which is typified by a patient's inability to properly move the muscles of the tongue and ...
By contrast, anomia is a deficit of expressive language, and a symptom of all forms of aphasia, but patients whose primary deficit is word retrieval are diagnosed with anomic aphasia. [2] Individuals with aphasia who display anomia can often describe an object in detail and maybe even use hand gestures to demonstrate how the object is used, but ...
People also with anomic aphasia tend to know how to use an object, but rather can not name the aforementioned object. Any damage in or near the zone of language can result in anomic aphasia. Other forms of aphasia often transition into a syndrome of primarily anomic aphasia in the process of recovery. [3]
Transcortical sensory aphasia is characterized as a fluent aphasia. Fluency is determined by direct qualitative observation of the patient’s speech to determine the length of spoken phrases, and is usually characterized by a normal or rapid rate; normal phrase length, rhythm, melody, and articulatory agility; and normal or paragrammatic speech. [5]
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In neurology, conduction aphasia, also called associative aphasia, is an uncommon form of difficulty in speaking . It is caused by damage to the parietal lobe of the brain . An acquired language disorder , it is characterised by intact auditory comprehension , coherent (yet paraphasic ) speech production , but poor speech repetition .