刺激的知觉辨认难度与大脑两半球间的分布式加工  

TASK DIFFICULTY IN PERCEPTUAL IDENTIFICATION OF STIMULUS AND DISTRIBUTING PROCESSING ACROSS TWO HEMISPHERES

作　　者：蔡厚德[1] 

机构地区：[1]南京师范大学教科院脑与行为实验室,南京210097

出　　处：《心理学报》2005年第1期14-18,共5页Acta Psychologica Sinica

基　　金：江苏省哲学社会科学研究"十五规划基金项目成果"(编号 :0 4JYB0 13 );江苏省教育厅自然科学基金项目 (编号 :2 0 0 2JKYTSJB12 2 )

摘　　要：采用半视野速示术将标准刺激在中间视野呈现 ,比较刺激以不同偏心视角 (3 5° ,5°和 6 5°)在左或右视野同时呈现 ,以检查不同偏心视角引起比较刺激知觉辨认难度的改变对汉字大写数字奇 -偶概念同 /异判断任务在大脑两半球间分布式加工的影响。结果显示 :随偏心视角的增大正确反应时和错误百分数均显著提高 ;三种视角条件下左右手的正确反应时均有明显的右视野 (左半球 )优势 ;3 5°视角右视野 (左半球 )呈现时右手反应明显快于左手 ,5°视角右视野 (左半球 )与左视野 (右半球 )呈现时均为右手反应明显快于左手 ,6 5°视角右视野 (左半球 )与左视野 (右半球 )呈现时均为左手反应明显快于右手。这些结果提示 :本研究条件下只有比较刺激在 6 5°偏心视角呈现时刺激和反应可能出现大脑两半球间分布式加工 ,3 5°和 5°视角呈现时可能为左半球单独加工。 6Tachistoscopic visual half-field test was used to examine effects of an early perceptual factor of stimuli on the distributing processing across two hemispheres. An odd-even conceptual decision task on pairs of numerals in ca- pitals of Chinese characters was given to subjects involving three different eccentricities( 3.5 , 5°and 6.5°) of comparative numerals in order to vary the perceptual processing demands of the stimuli. The results showed that the reaction times were slower and the percentage of errors higher while increasing eccentricity of the comparative stimuli. There was a superiority of correct reaction speed for RVF(LH)presentation, regardless of eccentricities and responding hands. A comparasion of the left and the right hand indicated that response with the left hand was more rapid than with the right hand at 6.5° , and response with the right hand was more rapid than with the left hand at 3.5° and 5°. These results suggest that the stimulus and response processing for this task tend to be distributed across the two hemispheres at 6.5°, and operated at 3.5° and 5° by the left hemisphere independently. The effect of distributing processing appeared at 6.5° could result from more difficult perceptual and attentional demands of the comparative stimuli.

关 键 词：任务难度 分布式加工 半视野速示术 偏心视角 

分 类 号：B842.2[哲学宗教—基础心理学]