SEMANTIC ACCESS IN THE RIGHT CEREBRAL HEMISPHERE

这个项目的目标是调查左派的贡献 以及右脑对语言过程的影响，尤其是， 来审查关于右脑对 语义知识的阐述。权利的参与 长期以来，大脑半球一直被怀疑是语义性失语的来源 副语法错误，但理论上对此关注甚少 有可能。我们对这些相关的观点进行了研究：1)词汇语义 程序(狭义地定义为语义和知识的那些方面 在语法操作中起作用的)由Left执行 半球过程，但知觉和概念性语义知识 两个半球之间共享；2)语义的表征 知识在不同的半球之间并不不同，但获取的时间进程不同 对知觉、概念和词汇的加工不同，并产生 半球效应，具体地说，3)自动传播激活 在两个半球的词汇通达过程中发挥作用，但 受控加工更多的是左半球的特点。 左右半球的结构和加工特点 将在三个人群中对语言进行调查；患有 为了控制顽固性癫痫发作而进行了穹隆切开术， 右半球和左半球局灶性病变和正常的患者 研究对象。任务的设计使得诸如刺激等变量 演示文稿和所需的响应将尽可能地不同于 允许在不同研究之间比较结果。把这些实验放在一起 应该能让我们更确切地描述右半球的界限 参与正常和不正常的语言功能，并更好地 理解感知、概念和词汇的表示 两个半球的信息。如果我们要开发出治疗方法 争取保留非优势半球功能的策略 对于失语症患者，我们了解他们是什么，并 它们是如何整合的。

The goal of this project is to investigate the contributions of the left and right cerebral hemispheres towards language processes, in particular, to examine claims regarding the contribution of the right hemisphere to the elaboration of semantic knowledge. The participation of the right hemisphere has long been suspected as a source of semantic paraphasic and paralexic errors, but there has been little theoretical attention to this possibility. We investigate these related positions: 1) lexical semantic procedures (narrowly defined as those aspects of semantic and knowledge that plays a role in syntactic operations) are carried out by left hemisphere processes, but perceptual and conceptual semantic knowledge is shared between hemispheres, 2) the representation of semantic knowledge does not differ between hemispheres, but time course of access to perceptual, conceptual, and lexical processes differ and yields hemispheric effects, and, specifically, 3) automatic spreading activation plays a role in lexical access procedures in both hemispheres, but controlled processing is more characteristic of the left hemisphere. The structure and processing characteristics of left and right hemisphere language will be investigated in three populations; patients who have undergone callosotomy for the control of intractable seizure disorders, patients with focal right and left hemisphere lesions, and normal subjects. Tasks have been designed so that variables such as stimulus presentation, and response required will vary as little as possible to allow comparison of results between studies. Together these experiments should allow us to state more firmly the limits of right hemisphere participation in normal and abnormal language function and to better understand the representation of perceptual, conceptual, and lexical information in both hemispheres. If we are to develop therapeutic strategies that enlist the preserved functions of non-dominant hemisphere in aphasic patients it is crucial that we understand what they are and how they are integrated.