The benefits of bihemispheric processing in interhemispheric interaction

本研究的第一个目的是探讨脑半球整合的机制。先前的模型表明，当任务的加工负荷越高时，双脑加工的效益越强。研究结果表明，在任务复杂度相对较高的情况下，当双脑加工负荷不平衡时，双脑加工的效益也会降低。这些结果表明，大脑半球之间处理负荷的不平衡将阻碍每个半球并行工作。本研究的第二个目的是考察词汇视觉熟悉度对大脑半球间词汇加工的影响。单词或假词在左、右或双侧视野中短暂呈现。先前的研究结果表明，双侧视野条件下的表现优于单侧视野条件下的表现，双侧视野条件下的表现表现在单词条件下，而不是在假词条件下。目前的研究结果表明，只有在视觉熟悉的条件下才能获得这种特定单词的双侧增益，而在视觉不熟悉的条件下则没有。这些结果表明，视觉对词汇的熟悉程度对大脑半球间词汇加工有影响。本研究的第三个目的是利用侧卫范式来研究大脑半球间的相互作用。在单侧视场或分割的双侧视场中简要呈现一对汉字色词和彩色简单图形（干扰物）。被试被要求识别汉字颜色词的墨色。结果表明，当色字的墨色与干扰物的墨色不相容时，会产生类似stroop的干扰。此外，与单侧视野相比，双侧视野条件下的干扰程度有所减弱。少

The first purpose of the present research was to investigate the mechanism of interhemispheric integration. The previous model suggested that the benefits of bihemispheric processing was enhanced as the processing load of the task was higher. The present results demonstrated that the benefits of bihemispheric processing was reduced in the condition where the processing load between the hemispheres in the across-hemisphere condition was imbalanced even when the task complexity was relatively higher. These results suggested that the imbalance of the processing load between the hemispheres would hamper each hemisphere to work in parallel.The second purpose of the present research was to examine the effects of visual familiarity of words on interhemispheric lexical processing. Word or pseudoword was briefly presented in a left, right or bilateral visual-field. Previous findings suggested that a bilateral gain, in which the performance in a bilateral visual-fields condition was superior to … More that in a unilateral visual-field condition, showed up in the word condition, not in the pseudoword condition. The present results demonstrated that such a word-specific bilateral gain was obtained only in the visually familiar condition, not in the visually unfamiliar condition. These results suggested that the visual familiarity for a word had an influence on the interhemispheric lexical processing.The third purpose of the present research was to investigate the interhemispheric interaction using a flanker paradigm. A pair of Kanji color-word and colored simple figure (distracter) was briefly presented in a unilateral visual-field or divided bilateral visual-fields. The subjects were asked to identify the ink color of Kanji color-word. The results showed that when the ink color of color-word was incompatible with that of a distracter, the Stroop-like interference was obtained. Furthermore, the degree of the interference was attenuated in the bilateral visual-field condition, compared with the unilateral visual-field condition. Less