MENTAL COMPARISON - P300 COMPONENT OF THE ERP REFLECTS THE SYMBOLIC DISTANCE EFFECT
MENTAL COMPARISON - P300 COMPONENT OF THE ERP REFLECTS THE SYMBOLIC DISTANCE EFFECT
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DOI：
10.1097/00001756-199309000-00016
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发表时间：
1993-09-10
期刊：
影响因子：
1.7
通讯作者：
ULLSPERGER, P
中科院分区：
文献类型：
--
作者：
GRUNE, K;MECKLINGER, A;ULLSPERGER, P
采用行为测量和事件相关电位（ERP）研究了数字比较任务中的符号距离效应。同时显示11 - 20范围内的两个数字，受试者必须指出右侧数字是否小于或大于左侧数字。根据两个数字之间的数值差异，选择性地平均反应时间、错误率和ERP。符号距离效应得到证实：反应时间和错误率随着两个数字之间差异的增加而显着降低。P300波幅和潜伏期也存在显著的距离效应。数值差越大，P300波幅越大，P300潜伏期越短。这一发现表明，数字差异是有效的刺激编码过程中已经。
THE symbolic distance effect was studied in a numerical comparison task by means of behavioural measures and event-related potentials (ERP). Two numbers in the range from 11 to 20 were presented simultaneously and the subjects had to indicate if the right side number was smaller or larger than the left side number. Reaction time, error rate and ERPs were selectively averaged according to the numerical differences between the two numbers. The symbolic distance effect was confirmed: Reaction times and error rates decreased significantly with increasing difference between the two numbers. A significant distance effect was also found for both P300 amplitude and latency. The larger the numerical difference the larger the P300 amplitude and the P300 latency tended to be shorter. This finding suggests that the numerical difference is effective already during stimulus encoding.