利手与注意偏向对双耳分听汉字大脑功能优势的影响

对24名左利手和24名右利手被试在三种注意条件（刺激驱动、注意左耳和注意右耳）下进行双耳分听汉字测验,检查中国人利手与汉字听觉词汇加工大脑两半球功能优势的关系,同时考察被试的注意偏向对优势效应的影响.结果表明：（1）汉语母语左利手被试加工汉字听觉词汇的大脑功能偏侧化组织明显不同于右利手;（2）右利手被试在刺激驱动条件下的右耳（左半球）优势易受注意偏向的调节出现明显波动;（3）注意偏向对左利手被试的影响主要表现为优势的左耳（右半球）成绩的下降与非优势的右耳（左半球）成绩的提高,这暗示汉语母语左利手者可能存在汉字听觉词汇加工的潜在两半球表征.

Effects of Handedness and Attentional Biases on Cerebral Functional Dominance in Dichotic Listening Chinese Character Words

Twenty-four left handed and twenty-four right handed subjects were examined using dichotic listening(DL) test of Chinese single-character words under three attentional conditions(stimulus-driven,forced attention to the left ear and forced attention to the right ear) to investigate the relationship between the Chinese handedness and the cerebral functional dominance,and evaluate effects of attentional biases on asymmetries in the processing of dichotic listening.The results suggest that the brain lateralizational organization in processing auditorily Chinese character words in left handers could be different from that of right handers.The attentional biases in DL could bring about a dynamic fluctuation of performance of the dominant LH in right handers.The ambilateral changes in favor of the non-dominant LH between the two hemispheres might implicate a potential bilateral representation of the processing auditorily Chinese character words in left handers.