Sub-processes of working memory in the N-back task : an investigation using ERPs
Chen, Yung-Nien, Mitra, Subhobrata and Schlaghecken, Friederike. (2008) Sub-processes of working memory in the N-back task : an investigation using ERPs. Clinical Neurophysiology, Volume 119 (Number 7). pp. 1546-1559. ISSN 1388-2457Full text not available from this repository.
Official URL: http://dx.doi.org/10.1016/j.clinph.2008.03.003
Objective: The N-back task is frequently used in working memory studies. N-parameters allow experimental psychologists to analyze the sub-processes of N-back tasks in addition to general processing. However, previous imaging studies have not closely scrutinized these sub-processes. In the current study, three sub-processes in the N-back task were proposed using a logical task analysis: matching, replacement and shift. Domain-specific lateralization in spatial and verbal working memory was investigated in terms of this model.
Methods: This model was tested with two ERP experiments during N-back tasks, one conceptual (top-down) and one data-driven (bottom-up).
Results: Domain-specific lateralization was observed as predicted in the shift sub-process of the conceptual task and in the replacement sub-process of the data-driven task. Match-specific lateralization was also found.
Conclusions: The results support our three-sub-process model of the N-back task and our hypothesis that replacement is a data-driven process with a posterior locus whereas shift is a more conceptual process with a more frontal locus.
Significance: The proposed model correctly predicted ERP patterns in conceptual and data-driven N-back tasks and is potentially useful in understanding the neurophysiologic basis of N-back task performance. The similarity between match- and domain-specific lateralization in N-back tasks raised several issues for further investigation. (C) 2008 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.
|Item Type:||Journal Article|
|Subjects:||R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry|
|Divisions:||Faculty of Science > Psychology|
|Journal or Publication Title:||Clinical Neurophysiology|
|Publisher:||Elsevier Ireland Ltd.|
|Official Date:||July 2008|
|Number of Pages:||14|
|Page Range:||pp. 1546-1559|
|Access rights to Published version:||Restricted or Subscription Access|
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