Document Detail


Attentional orienting to mnemonic representations: Reduction of load-sensitive maintenance-related activity in the intraparietal sulcus.
MedLine Citation:
PMID:  22960415     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The orienting of attention to internal or mnemonic representations held in visual working memory (VWM) has recently become a field of increasing interest. While a number of studies support the hypothesis that attention to selected representations in VWM reduces memory load, conclusive findings are still missing. In this event-related functional magnetic resonance imaging (fMRI) study, we directly investigated whether attentional orienting to mnemonic representations reduces activity in VWM storage-related areas of the brain. VWM load was manipulated by asking subjects to memorize two, four or six items. A retro-cue during the subsequent delay period asked subjects to attend to just one of these items for a subsequent test. This was compared to trials where subjects were required to continue attending to all items for the subsequent test. Data show reduction of load-sensitive maintenance-related activity along the right intraparietal sulcus (IPS), directly linked to attentional orienting. While activity in the anterior IPS reflected the number of representations in the focus of attention, the activation pattern in the posterior IPS suggested residual activation related to unattended items. This dissociation is in line with a functional subdivision of the right IPS according to attentional and mnemonic properties.
Authors:
Sabrina Trapp; Jöran Lepsien
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-13
Journal Detail:
Title:  Neuropsychologia     Volume:  50     ISSN:  1873-3514     ISO Abbreviation:  Neuropsychologia     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-9-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0020713     Medline TA:  Neuropsychologia     Country:  -    
Other Details:
Languages:  ENG     Pagination:  2805-2811     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Affiliation:
Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstrasse 1a, 04103 Leipzig, Germany.
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