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In psychology, alogia (Greek ἀ-, “without”, and λόγος, “speech”), or poverty of speech, is a general lack of additional, unprompted content seen in normal speech. As a symptom, it is commonly seen in patients suffering from schizophrenia, and is considered as a negative symptom. It can complicate psychotherapy severely because of the considerable difficulty in holding a fluent conversation. Alogia is often considered a form of aphasia, which is a general impairment in linguistic ability. It often occurs with intellectual disability and dementia as a result of damage to the left hemisphere of the brain. People can revert to alogia as a way of reverse psychology, or avoiding questions. == Characteristics == Alogia is characterized by a lack of speech, often caused by a disruption in the thought process. Usually, an injury to the left hemisphere of the brain will cause alogia to appear in an individual. In conversation, alogic patients will reply very sparsely and their answers to questions will lack spontaneous content; sometimes, they will even fail to answer at all. Their responses will be brief, generally only appearing as a response to a question or prompt.〔Alpert, M., Kotsaftis, A. & Pouget, E.R. (1997). Speech fluency and schizophrenic negative signs. Schizophrenia Bulletin, 23, 171-177.〕 Apart from the lack of content in a reply, the manner in which the person delivers the reply is affected as well. Patients affected by alogia will often slur their responses, and not pronounce the consonants as clearly as usual. The few words spoken usually trail off into a whisper, or are just ended by the second syllable. Studies have shown a correlation between alogic ratings in individuals and the amount and duration of pauses in their speech when responding to a series of questions posed by the researcher.〔〔Alpert, M. Clark, A. & Pouget, E.R. (1994). The syntactic role of pauses in the speech patients with schizophrenia and alogia. Journal of Abnormal Psychology, 103, 750-757〕 The inability to speak stems from a deeper mental inability that causes alogic patients to have difficulty grasping the right words mentally, as well as formulating their thoughts. A study investigating alogiacs and their results on the category fluency task showed that people with schizophrenia who exhibit alogia display a more disorganized semantic memory than controls. While both groups produced the same number of words, the words produced by people with schizophrenia were much more disorderly and the results of cluster analysis revealed bizarre coherence in the alogiac group. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「alogia」の詳細全文を読む スポンサード リンク
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