EVENT-RELATED POTENTIALS, LEXICAL DECISION AND SEMANTIC PRIMING
EVENT-RELATED POTENTIALS, LEXICAL DECISION AND SEMANTIC PRIMING
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DOI：
10.1016/0013-4694(85)90008-2
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发表时间：
1985-01-01
期刊：
影响因子：
--
通讯作者：
WOOD, CC
中科院分区：
文献类型：
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作者：
BENTIN, S;MCCARTHY, G;WOOD, CC
在词汇判断任务中记录事件相关电位（ERP），以探讨语义启动的电生理伴随。刺激是240个单词和240个非单词，以固定的试验间隔呈现1次/试验。要求受试者通过按下2个响应按钮中的1个将每个刺激分类为单词或非单词。ERP记录从14个头皮位置，右眶下嵴和左耳垂，所有涉及到一个平衡的noncephalic参考。RT [反应时间]和错误数据证实，语义启动发生在所采用的条件下：启动词（前面是语义相关的词）被识别为词的速度和准确性比被识别为词的速度和准确性比未启动的词（前面是语义无关的词或非词）。所有刺激类型的ERP的特征在于在550和650 ms之间的大的正性峰值，之前是在0.0ms处的负向偏转峰值。启动和未启动的话ERP显着不同，发散200-250毫秒刺激发作后，达到最大值附近的负向偏转的峰值在400毫秒。这些差异观察到在两个半球的位置，并在centroparietal区域最大。虽然P300潜伏期之间的差异启动和未启动的话也得到了，启动效应的ERP在较短的潜伏期不能解释单独的P300潜伏期的影响。本文还讨论了语义启动的ERP伴随成分与P300、N200和N400的可能关系。
ERP [event-related potential] were recorded during a lexical decision task to investigate electrophysiological concomitants of semantic priming. The stimuli were 240 words and 240 nonwords presented 1/trial at a fixed intertrial interval. Subjects were required to classify each stimulus as a word or nonword by pressing 1 of 2 response buttons. ERP were recorded from 14 scalp locations, the right suborbital ridge and the left earlobe, all referred to a balanced noncephalic reference. RT [reaction time] and error data confirmed that semantic priming occurred under the conditions employed: primed words (those preceded by a semantically related word) were identified as words faster and more accurately than were identified as words faster and more accurately than were unprimed words (those preceded by semantically unrelated words or non-words). ERP for all stimulus types were characterized by a large positivity peaking between 550 and 650 ms, preceded by a negative-going deflection peaking at .apprx. 400 ms. ERP for primed and unprimed words differed significantly, diverging 200-250 ms following stimulus onset, reaching a maximum near the peak of the negative-going deflection at 400 ms. These differences were observed at locations over both hemispheres and were maximal in the centroparietal region. Although P300 latency differences between primed and unprimed words were also obtained, the priming effect on ERP at shorter latencies could not be explained solely by P300 latency effects. Possible relationships between these ERP concomitants of semantic priming and P300, N200 and N400 were discussed.