The dysphasic patient has an impairment of speech and cannot arrange words correctly. Dysphasia is usually caused by a cerebral lesion, such as a stroke. The degree of dysphasia can vary enormously and can be as extensive as almost complete aphasia. Although patients may appear relatively unresponsive, they may be totally aware of all conversation. Therefore, all discussions conducted in the presence of such patients must be undertaken with the assumption that the patient can understand. Before the interview, the interviewer may give patients a pen and paper to determine whether they can respond by writing ''Yes'' and ''No'' answers.
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