LATERALIZATION OF SEMANTIC FACILITATION AND INHIBITION

这项研究的主要目的是调查 正常大脑，负责语义功能的半球，可能 在思维障碍中受损。拟议的研究将使用 视觉半场刺激研究语义易化 和左右半球的抑制过程。 普通人。主要的假设是左翼 大脑半球以集中的方式处理意义，通过促进 相关含义和抑制那些被认为不相关的含义，而 右脑维持着一组 语义上没有抑制的相关意义。的作用 不同脑区语义加工的注意选择性 半球将通过三个系列的实验进行检查。在……里面 系列1，词汇启动范式将被用来研究 语义预期在语义抑制产生中的作用 和促进。在系列2中，“消极启动”范例将 被用来研究促进和抑制过程 当两个同时出现的单词中的一个是 视觉注意力的焦点。在系列3中，语义促进和 抑制在更高级别的认知任务中被检测 对意义的必要判断。据预测，语义 易化作用将发生在两个大脑半球，但 依赖于注意力选择的抑制过程将 仅限于左半球。重要的是要 了解这些功能的神经学基础，因为 语义促进和语义促进的正常相互作用中的故障 抑制可能会产生一些精神分裂症症状(例如，松弛 协会)。

The major objective of this research is to investigate, in the normal brain, the hemispheric for semantic functions which may be impaired in thought disorders. The proposed studies will use visual half-field stimulation to investigate semantic facilitation and inhibition processes in the left and right hemispheres of normal individuals. The primary hypothesis is that the left hemisphere processes meaning in a focal manner, by facilitating relevant meanings and inhibiting those deemed irrelevant, while the right hemisphere maintains facilitation for a set of semantically related meanings without inhibition. The role of attentional selectivity in semantic processing in each cerebral hemisphere will be examined in three series of experiments. In Series 1, lexical priming paradigms will be used to investigate the role of semantic expectancies in producing semantic inhibition and facilitation. In Series 2, the "negative priming" paradigm will be used to investigate facilitatory and inhibitory processes produced when one of two simultaneously presented words is the focus of visual attention. In Series 3, semantic facilitation and inhibition are examined in higher order cognitive tasks which required judgments of meaning. It is predicted that semantic facilitation will occur in both cerebral hemispheres, but that inhibitory processes, which depend upon attentional selection, will be restricted to the left hemisphere. It is important to understand the neurological basis of these functions, since breakdowns in the normal interplay of semantic facilitation and inhibition could produce some schizophrenic symptoms (e.g., loose associations).