Relander Kristiina, Rämä Pia
Cognitive Brain Research Unit, Department of Psychology, P.O. Box 9, 00014 University of Helsinki, Finland.
Brain Res. 2009 Feb 3;1252:143-51. doi: 10.1016/j.brainres.2008.11.050. Epub 2008 Nov 27.
Working memory for voice identity and words was studied to investigate whether the neural system underlying extralinguistic and linguistic information processing is dissociated and whether the possible differences in the distribution of activity are related to specific periods of working memory tasks. Separate analyses of task-related activations evoked during the encoding, maintenance, and recognition periods of the memory tasks were performed. During the voice task, the superior temporal, ventral prefrontal and medial frontal cortices were activated in comparison with the control task whereas the word task produced activation in the occipital, parietal, and dorsal prefrontal areas. Direct contrasts between different periods of the tasks indicated that the ventral prefrontal cortex and the right superior temporal sulcus/gyrus were more activated during recognition than encoding and maintenance periods in the voice compared with the word task. In contrast, the right supramarginal gyrus was more active during the recognition than encoding period in the word compared with the voice task. The results suggest that dissociable neural substrates are recruited for processing of linguistic and extralinguistic information during the recognition period of a working memory task.
研究了语音识别和单词的工作记忆，以探究语言外和语言信息处理的神经系统是否分离，以及活动分布的可能差异是否与工作记忆任务的特定阶段相关。对记忆任务的编码、维持和识别阶段诱发的任务相关激活进行了单独分析。在语音任务中，与对照任务相比，颞上叶、腹侧前额叶和内侧前额叶皮质被激活，而单词任务则在枕叶、顶叶和背侧前额叶区域产生激活。任务不同阶段之间的直接对比表明，与单词任务相比，在语音识别过程中，腹侧前额叶皮质和右侧颞上沟/回在识别阶段比编码和维持阶段更活跃。相比之下，与语音任务相比，在单词识别阶段，右侧缘上回比编码阶段更活跃。结果表明，在工作记忆任务的识别阶段，可分离的神经基质被用于处理语言和语言外信息。
