The benefits of bihemispheric processing in interhemispheric interaction

本研究的第一个目的是探讨大脑半球间整合的机制。先前的模型表明，随着任务的加工负荷越高，双半球加工的好处越大。本研究结果表明，即使在任务复杂度相对较高的情况下，在跨半球条件下，当两个半球之间的加工负荷不平衡时，双半球加工的益处也会减少。本研究的第二个目的是考察词汇的视觉熟悉度对大脑半球间词汇加工的影响。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，在双侧视野条件下的表现优于…的双侧增益更多的是在单侧视野条件下，出现在单词条件下，而不是在假词条件下。目前的结果表明，只有在视觉熟悉的条件下才能获得这种特定于单词的双边收益，而在视觉不熟悉的条件下不能获得这种特定的双边收益。这些结果表明，词汇的视觉熟悉度对大脑半球间的词汇加工有影响。本研究的第三个目的是使用FRANKER范式来研究大脑半球间的交互作用。一对汉字色词和彩色简单图形(分心符)被短暂呈现在单侧视野或双侧分开视野中。受试者被要求识别汉字颜色词的墨水颜色。结果表明，当颜色词的墨水颜色与分心物的墨水颜色不相容时，会产生类Stroop干扰。此外，与单侧视野条件相比，双侧视野条件下的干扰程度有所减弱。较少

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