[Differential visual attention scales directed by location versus semantic cue].
[Differential visual attention scales directed by location versus semantic cue].
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发表时间：
2003-02
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通讯作者：
Wen-bin Gao;Jing-han Wei;Xiao-hu Peng;Yue-jia Luo
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作者：
Wen-bin Gao;Jing-han Wei;Xiao-hu Peng;Yue-jia Luo
目的比较位置线索和汉字线索引导视觉空间注意的皮层机制。方法11名视力正常的健康成人（平均年龄19岁）。在实验一中，线索是一个带黑色实线的圆圈。球杆有三种尺寸：小号、中号和大号。实验二以三个直径与实验一相同的黑色同心圆作为背景。提示是三个汉字之一，分别是小，中，大。被试的任务是辨别目标的方位。结果实验Ⅱ的RT较长，ISI较短。实验Ⅱ提示诱发的前上N1波幅大于实验Ⅰ。实验II的下后P1潜伏期比实验I的长。比较靶诱发的ERP，实验II的下后P1和N1潜伏期比实验I的长，实验II的下后P2波幅比实验I的大。结论汉语线索加工较方位线索加工发生在更高水平的脑功能区。后者在线索加工的前期需要更多的资源，而在任务的后期需要更少的资源。
OBJECTIVE To compare the cortical mechanisms associated with visual spatial attention directed by location cues and Chinese character cues. METHOD Eleven healthy adults (mean age=19) with normal vision served as the subjects. In experiment I, the cue was a circle with black solid line. There were three cue sizes: small, medium and large. In experiment II, three black concentric circles were presented as background, their diameters were the same as the three cues used in experiment I. The cue was one of three Chinese characters small, medium or large respectively. The task of the subjects was to discriminate the target's orientation. RESULT RT in experiment II was longer with short ISI. The anterosuperior N1 amplitude elicited by the cue in experiment II was larger than that in experiment I. The inferoposterior P1 latency in experiment II was longer than that in experiment I. Comparing the target evoked ERP, the inferoposterior P1 and N1, latency of experiment II was longer than that in experiment I, the inferoposterior P2 amplitude in experiment II was larger than that in experiment I. CONCLUSION The processing of Chinese cue takes place at higher level functional brain regions compared to processing of location cue. The later requires more resource in the earlier stage of cue process and less in the subsequent stage of the task.