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Sub-processes of working memory in the N-back task : an investigation using ERPs
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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. doi:10.1016/j.clinph.2008.03.003
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Official URL: http://dx.doi.org/10.1016/j.clinph.2008.03.003
Abstract
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. | ||||||||
| ISSN: | 1388-2457 | ||||||||
| Official Date: | July 2008 | ||||||||
| Dates: |
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| Volume: | Volume 119 | ||||||||
| Number: | Number 7 | ||||||||
| Number of Pages: | 14 | ||||||||
| Page Range: | pp. 1546-1559 | ||||||||
| DOI: | 10.1016/j.clinph.2008.03.003 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
Data sourced from Thomson Reuters' Web of Knowledge
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