Joubert Sven, Beauregard Mario, Walter Nathalie, Bourgouin Pierre, Beaudoin Gilles, Leroux Jean-Maxime, Karama Sherif, Lecours André Roch
Centre de Recherche, Institut universitaire de gériatrie de Montréal, Canada.
Brain Lang. 2004 Apr;89(1):9-20. doi: 10.1016/S0093-934X(03)00403-6.
The purpose of the present study was to compare the brain regions and systems that subserve lexical and sublexical processes in reading. In order to do so, three types of tasks were used: (i). silent reading of very high frequency regular words (lexical task); (ii). silent reading of nonwords (sublexical task); and, (iii). silent reading of very low frequency regular words (sublexical task). All three conditions were contrasted with a visual/phonological baseline condition. The lexical condition engaged primarily an area at the border of the left angular and supramarginal gyri. Activation found in this region suggests that this area may be involved in mapping orthographic-to-phonological whole word representations. Both sublexical conditions elicited significantly greater activation in the left inferior prefrontal gyrus. This region is thought to be associated with sublexical processes in reading such as grapheme-to-phoneme conversion, phoneme assembly and underlying verbal working memory processes. Activation in the left IFG was also associated with left superior and middle temporal activation. These areas are thought to be functionally correlated with the left IFG and to contribute to a phonologically based form of reading. The results as a whole demonstrate that lexical and sublexical processes in reading activate different regions within a complex network of brain structures.
本研究的目的是比较阅读中支持词汇和次词汇加工的脑区和系统。为了做到这一点，使用了三种类型的任务：（i）. 默读高频规则词（词汇任务）；（ii）. 默读非词（次词汇任务）；以及（iii）. 默读低频规则词（次词汇任务）。所有这三种情况都与视觉/语音基线条件进行了对比。词汇条件主要激活了左角回和缘上回边界处的一个区域。在该区域发现的激活表明，这个区域可能参与将正字法映射到语音的全词表征。两种次词汇条件在左下前额叶回均引发了显著更强的激活。该区域被认为与阅读中的次词汇加工有关，如音素到音素的转换、音素组合以及潜在的言语工作记忆过程。左额下回的激活也与左颞上回和颞中回的激活相关。这些区域被认为在功能上与左额下回相关，并有助于基于语音的阅读形式。总体结果表明，阅读中的词汇和次词汇加工在一个复杂的脑结构网络中激活不同的区域。
