Brown C M, Hagoort P, Chwilla D J
Max Planck Institute for Psycholinguistics, Nijmegen, The Netherlands.
Brain Lang. 2000 Apr;72(2):158-90. doi: 10.1006/brln.1999.2284.
Two experiments are reported that provide evidence on task-induced effects during visual lexical processing in a prime-target semantic priming paradigm. The research focuses on target expectancy effects by manipulating the proportion of semantically related and unrelated word pairs. In Experiment 1, a lexical decision task was used and reaction times (RTs) and event-related brain potentials (ERPs) were obtained. In Experiment 2, subjects silently read the stimuli, without any additional task demands, and ERPs were recorded. The RT and ERP results of Experiment 1 demonstrate that an expectancy mechanism contributed to the priming effect when a high proportion of related word pairs was presented. The ERP results of Experiment 2 show that in the absence of extraneous task requirements, an expectancy mechanism is not active. However, a standard ERP semantic priming effect was obtained in Experiment 2. The combined results show that priming effects due to relatedness proportion are induced by task demands and are not a standard aspect of online lexical processing.
报告了两项实验，它们为在启动-目标语义启动范式下视觉词汇加工过程中的任务诱导效应提供了证据。该研究通过操纵语义相关和不相关单词对的比例，聚焦于目标预期效应。在实验1中，使用了词汇判断任务，并获得了反应时间（RTs）和事件相关脑电位（ERPs）。在实验2中，受试者默读刺激材料，没有任何额外的任务要求，并记录了ERPs。实验1的RT和ERP结果表明，当呈现高比例的相关单词对时，预期机制对启动效应有贡献。实验2的ERP结果表明，在没有外部任务要求的情况下，预期机制不活跃。然而，在实验2中获得了标准的ERP语义启动效应。综合结果表明，由于相关性比例导致的启动效应是由任务需求诱导的，而不是在线词汇加工的标准方面。
