Control processes in verbal working memory: An event-related potential study
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- 作者：Ivan Kiss ; Scott Watter ; Jennifer J. Heisz ; Judith M. Shedden
- 关键词：Working memory ; Event-related potentials ; ERP ; Executive control
- 刊名：Brain Research
- 出版年：2007
- 出版时间：3 October 2007
- 年：2007
- 卷：1172
- 期：Complete
- 页码：67-81
- 全文大小：2080 K
文摘
Event-related potentials (ERPs) were recorded using a large electrode array while subjects engaged in tasks designed to dissociate control from storage/maintenance processes in verbal working memory (WM). Increased ERP negativity (450–900 ms post-stimulus onset) over left frontal regions emerged only when required dynamic updating/revision of WM stores was initiated, with augmentation of right frontal negativity in the same epoch relative to more general overall task demands. Increased ERP positivity in a similar time window over parietal regions reflected initiation of required rehearsal/maintenance of memory set contents, with progressive amplitude increases with repeated dynamic updating/revision of memory stores, suggesting increased effortful activity to resist proactive interference effects. These findings are consistent with a left frontal-parietal network for process control in verbal working memory.