Article (Scientific journals)
Parietal-occipital interactions underlying control-and representation-related processes in working memory for nonspatial visual features
Gosseries, Olivia; Yu, Q.; Larocque, J. J. et al.
2018In Journal of Neuroscience, 38 (18), p. 4357-4366
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Keywords :
Attentional control; Information storage; Memory load; Occipital cortex; Parietal cortex; Visual working memory
Abstract :
[en] Although the manipulation of load is popular in visual working memory research, many studies confound general attentional demands with context binding by drawing memoranda from the same stimulus category. In this fMRI study of human observers (both sexes), we created high-versus low-binding conditions, while holding load constant, by comparing trials requiring memory for the direction of motion of one random dot kinematogram (RDK; 1M trials) versus for three RDKs (3M), or versus one RDK and two color patches (1M2C). Memory precision was highest for 1M trials and comparable for 3M and 1M2C trials. And although delay-period activity in occipital cortex did not differ between the three conditions, returning to baseline for all three, multivariate pattern analysis decoding of a remembered RDK from occipital cortex was also highest for 1M trials and comparable for 3M and 1M2C trials. Delay-period activity in intraparietal sulcus (IPS), although elevated for all three conditions, displayed more sensitivity to demands on context binding than to load per se. The 1M-to-3M increase in IPS signal predicted the 1M-to-3M declines in both behavioral and neural estimates of working memory precision. These effects strengthened along a caudal-to-rostral gradient, from IPS0 to IPS5. Context binding-independent load sensitivity was observed when analyses were lateralized and extended into PFC, with trend-level effects evident in left IPS and strong effects in left lateral PFC. These findings illustrate how visual working memory capacity limitations arise from multiple factors that each recruit dissociable brain systems. © 2018 the authors.
Disciplines :
Neurosciences & behavior
Author, co-author :
Gosseries, Olivia   ;  Université de Liège - ULiège > GIGA : Coma Group
Yu, Q. ;  Department of Psychiatry, University of Wisconsin–Madison, Madison, WI, United States
Larocque, J. J.;  University of Wisconsin–Madison, Madison, WI, United States
Starrett, M. J.;  Department of Psychiatry, University of Wisconsin–Madison, Madison, WI, United States, Department of Psychology, University of California–Davis, Davis, CA, United States
Rose, N. S.;  Department of Psychiatry, University of Wisconsin–Madison, Madison, WI, United States, Department of Psychology, University of Notre Dame, Notre Dame, IN, United States
Cowan, N.;  Department of Psychology, University of Missouri, Columbia, MO, United States
Postle, B. R.;  Department of Psychiatry, University of Wisconsin–Madison, Madison, WI, United States, Department of Psychology, University of Wisconsin–Madison, Madison, WI, United States
 These authors have contributed equally to this work.
Language :
English
Title :
Parietal-occipital interactions underlying control-and representation-related processes in working memory for nonspatial visual features
Publication date :
2018
Journal title :
Journal of Neuroscience
ISSN :
0270-6474
eISSN :
1529-2401
Publisher :
Society for Neuroscience
Volume :
38
Issue :
18
Pages :
4357-4366
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
R01MH064498
Funders :
NIH - National Institutes of Health [US-MD]
Available on ORBi :
since 22 August 2019

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