Karanth P, Rangamani G N
Department of Speech Pathology, All India Institute of Speech and Hearing, Mysore.
Brain Lang. 1988 May;34(1):169-80. doi: 10.1016/0093-934x(88)90130-7.
Reports of crossed aphasia in single case studies of bilinguals have led to incidence studies of crossed aphasia among larger groups of stroke patients. Among a few others, studies carried out in India (K. R. Nair & Virmani, 1973 Indian Journal of Medical Research, 61, 9; P. Chary, 1986, In Language processing in bilinguals: Psycholinguistic and neuropsychological perspectives) have lent support to the notion of a higher incidence of crossed aphasia among bi- and multilinguals and form major citations in support of the hypothesis that bilingualism could lead to a greater bilateral cerebral representation of languages. This paper reports on the incidence of crossed aphasia in a large unselected population of stroke patients in monolingual and multilingual speakers of South India, which is in agreement with the previous reports of a higher incidence of crossed aphasia in multilinguals. However, along with this high incidence of crossed aphasia a low incidence of sinistrality was also seen. In order to confirm these findings and their significance two further studies were carried out-an incidence study of crossed aphasia in a population of mono- and multilingual aphasics and an incidence study of hand dominance in a normal population. The results and their significance to the issue of crossed aphasia in multilinguals are presented.
双语者单病例研究中关于交叉性失语症的报告，促使人们对更大规模中风患者群体中的交叉性失语症进行发病率研究。在印度开展的一些研究（K. R. 奈尔和维尔马妮，1973年，《印度医学研究杂志》，61卷，第9期；P. 查里，1986年，《双语者的语言处理：心理语言学和神经心理学视角》），支持了双语和多语者中交叉性失语症发病率较高这一观点，并且在支持双语会导致语言在大脑中更广泛双侧表征这一假设的文献中被大量引用。本文报告了印度南部单语和多语中风患者未筛选大样本群体中交叉性失语症的发病率，这与之前关于多语者交叉性失语症发病率较高的报告一致。然而，在交叉性失语症高发病率的同时，左利手的发病率也较低。为了证实这些发现及其意义，又开展了两项进一步的研究——一项针对单语和多语失语症患者群体的交叉性失语症发病率研究，以及一项针对正常人群的利手发病率研究。本文呈现了这些研究结果及其对多语者交叉性失语症问题的意义。
