School of Psychology, University of Queensland, Brisbane, QLD 4072, Australia.
J Cogn Neurosci. 2012 Feb;24(2):482-95. doi: 10.1162/jocn_a_00141. Epub 2011 Sep 29.
In two fMRI experiments, participants named pictures with superimposed distractors that were high or low in frequency or varied in terms of age of acquisition. Pictures superimposed with low-frequency words were named more slowly than those superimposed with high-frequency words, and late-acquired words interfered with picture naming to a greater extent than early-acquired words. The distractor frequency effect (Experiment 1) was associated with increased activity in left premotor and posterior superior temporal cortices, consistent with the operation of an articulatory response buffer and verbal self-monitoring system. Conversely, the distractor age-of-acquisition effect (Experiment 2) was associated with increased activity in the left middle and posterior middle temporal cortex, consistent with the operation of lexical level processes such as lemma and phonological word form retrieval. The spatially dissociated patterns of activity across the two experiments indicate that distractor effects in picture-word interference may occur at lexical or postlexical levels of processing in speech production.
在两项 fMRI 实验中，参与者对带有高频或低频掩蔽词或习得年龄不同掩蔽词的图片进行命名。与高频词相比，低频词会使图片命名更慢，且后习得的词对图片命名的干扰比先习得的词更大。掩蔽词频率效应（实验 1）与左前运动皮质和后上颞皮质活动增加有关，这与发音反应缓冲区和言语自我监测系统的运作一致。相反，掩蔽词习得年龄效应（实验 2）与左中颞和后中颞皮质活动增加有关，这与词汇水平过程（如词干和语音词形检索）的运作一致。这两项实验中活动的空间分离模式表明，图片-词干扰中的掩蔽词效应可能发生在言语产生的词汇或词后水平的加工过程中。
