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(詳細はreceptive and expressive language skills.〔(4) Brookshire, R. H. (2007). Introduction to neurogenic communication disorders (Seventh edition.). St. Louis, Mo.: Mosby Elsevier. 〕 Often times it is difficult for someone with global aphasia to produce a single word since there is such a severe language impairment. However, it is possible for an individual with global aphasia to have one or two preserved words which are used in response to every question.〔Manasco, M. (2014). Chapter 4: The Aphasias. In Introduction to neurogenic communication disorders . Burlington, MA: Jones & Barlett Learning.〕 This type of aphasia often results from a large lesion of the left perisylvian cortex〔(1) Alexander, M.P. & Loverso, Felice. (1992). A specific treatment for global aphasia. Clinical Aphasiology, 21.〕 and is associated with damage to Broca’s area, Wernicke’s area, and insular regions which are associated with aspects of language.〔(11) Ozeren, A., Koc, F., Demirkiran, M., Sönmezler, A., & Kibar, M. (2006). Global aphasia due to left thalamic hemorrhage. Neurology India, 54(4), 415-417.〕〔(16) Yourganov, G., Smith, K. G., Fridriksson, J., & Rorden, C. (2015). Predicting aphasia type from brain damage measured with structural MRI. Cortex, 73, 203-215.〕 Severe, acquired impairments of communicative abilities are present across all language modalities, and often no single communicative modality is notably better than another.〔(8) Goodglass, H., and Kaplan, E. (1983). The assessment of aphasia and related disorders. Philadelphia: Lea and Febiger.〕 Global aphasia profoundly impairs oral and written language production as well as auditory and written comprehension.〔(1) Alexander, M.P. & Loverso, Felice. (1992). A specific treatment for global aphasia. Clinical Aphasiology, 21.〕 Yet a person with global aphasia may still be able to express themselves through facial expressions, gestures and intonation.〔〔〔Appendix: Common Classifications of Aphasia. (n.d.). Retrieved from http://www.asha.org/Practice-Portal/Clinical-Topics/Aphasia/Common-Classifications-of-Aphasia/〕 ==Causes== Global aphasia typically results from an occlusion to the trunk of the middle cerebral artery (MCA),〔(4) Brookshire, R. H. (2007). Introduction to neurogenic communication disorders (Seventh edition.). St. Louis, Mo.: Mosby Elsevier. 〕 which affects a large portion of the perisylvian region of the cortex.〔(1) Alexander, M.P. & Loverso, Felice. (1992). A specific treatment for global aphasia. Clinical Aphasiology, 21.〕 The large areas in the anterior (Broca’s) and posterior (Wernicke’s) area of the brain are either destroyed or impaired because they are separate branches of the MCA that are supplied by its arterial trunk.〔(5) Collins, M., (1991). Diagnosis and Treatment of Global Aphasia. San Diego, CA: Singular Publishing Group, Inc.〕 Lesions usually result in extensive damage to the language areas of the left hemisphere, however global aphasia can result from damage to smaller, subcortical regions.〔(5) Collins, M., (1991). Diagnosis and Treatment of Global Aphasia. San Diego, CA: Singular Publishing Group, Inc.〕 Global aphasia is usually an effect of a thrombotic stroke rather than an embolic one.〔(5) Collins, M., (1991). Diagnosis and Treatment of Global Aphasia. San Diego, CA: Singular Publishing Group, Inc.〕 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「Global aphasia」の詳細全文を読む スポンサード リンク
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