In primary sensory dysphasia the patient cannot understand the speech of others. His own speech remains fluent, but contains errors in the use of words, syntax, and grammar. Writing and reading are also impaired. If, in this condition, the patient's speech becomes unintelligible, the disturbance is called 'jargon aphasia'. If only the repetition of a message is disturbed, the disorder is named 'conduction dysphasia'.
In pure word-deafness speech, reading, and writing are fluent and correct. The patient hears words as sounds, but cannot recognize their meaning. In pure word-blindness (alexia) speech and writing are normal but the patient cannot read with understanding.
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