刺激呈现时间对汉字语义加工脑偏侧化的影响  

Time Course of Semantic Processing of Chinese Characters Across the Cerebral Hemispheres

作　　者：潘伟[1] 饶恒毅[1] 高定国[1] 

机构地区：[1]中山大学心理学系,广州510275

出　　处：《心理科学》2007年第1期69-74,共6页Journal of Psychological Science

基　　金：研究得到国家自然基金(项目编号:30200079和30470571);中山大学桐山青年基金项目资助

摘　　要：以往关于汉字字词识别脑功能偏侧化的研究发现了左半球优势、右半球优势或者大脑两半球均势三种不同的结果。该研究采用一侧化Stroop范式(刺激分别只呈现于左视野、中央视野或右视野中),通过系统地改变刺激呈现时间以期探讨刺激呈现时间是可以解释这些不一致结果的可能因素之一。结果显示:对于右利手被试,在刺激呈现时间为60 ms时右半球出现了较强的Stroop效应,在刺激呈现200 ms时左右半球的Stroop效应没有表现出差异,在刺激呈现时间较长时左半球表现出较强的Stroop效应。该结果提示,随着刺激呈现时间的延长,语义优势发生了从右半球到左半球的转换。The study aimed to examine the relationship between stimulus exposure duration and hemispheric asymmetries for processing Chinese characters. Three durations （60,200 and duration between stimulus onset and response respectively） were used in a half visual field Stroop paradigm, in which colored stimuli were presented to the left, right, or center visual field. The results show that a） there is a right visual field-left hemisphere advantage at a stimulus duration between stimulus onset and response; b） there are no significant differences between right and left visual fields at a stimulus duration of 200 ms; and c） there is a left visual field-right hemisphere advantage at a stimulus duration of 60 ms, in processing Chinese characters for participants with right-handedness. The findings suggest that the advantages of processing the meaning of Chinese characters （Stroop task） across the cerebral hemispheres are modified by the stimulus presentation duration. In addition, the way of responding as quickly as possible or as accurately as possible can affect the direction of a Stroop effect. When responding as quickly as possible, participants show a quick response to congruent stimuuli, and when responding as accurately as possible, participants show a quick response to conflicting stimuli.

关 键 词：STROOP 效应 半球优势 语义加工 汉宇 

分 类 号：B842.3[哲学宗教—基础心理学]