SEMANTIC ACCESS IN THE RIGHT CEREBRAL HEMISPHERE

这个项目的目标是调查左派的贡献 和右脑半球对语言处理的影响，特别是 来检验关于右半球对 语义知识的阐述。 权利的参与 长期以来，人们一直怀疑大脑半球是语义性错语的来源， 语法错误，但很少有理论关注这一点 可能性 我们考察了这些相关的位置：1）词汇语义 程序（狭义地定义为语义和知识的那些方面 在句法操作中起作用的）由左执行 大脑半球的过程，但知觉和概念语义知识 （2）语义的表征 知识并没有在两个半球之间存在差异，而是在获取知识的时间过程上存在差异。 知觉、概念和词汇过程的不同， 半球效应，特别是3）自动扩散激活 在两个半球的词汇获取过程中发挥作用，但 控制性处理更具有左半球的特征。 左右半球的结构和加工特点 语言将在三个人群中进行研究; 接受胼胝体切开术以控制顽固性癫痫发作， 右半球和左半球局灶性病变的患者，以及正常 科目 任务的设计使得诸如刺激物等变量 所需的演示和响应将尽可能少地变化， 允许比较研究之间的结果。 这些实验 应该让我们更坚定地阐明右脑的局限性 参与正常和异常的语言功能， 理解知觉、概念和词汇的表征 两个半球的信息。 如果我们要开发治疗性的 非优势半球功能保留策略 在失语症患者中，我们必须了解他们是什么， 它们是如何融合的。

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.