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    Barch, Deanna M. and Ceaser, Alan 2012. Cognition in schizophrenia: core psychological and neural mechanisms. Trends in Cognitive Sciences, Vol. 16, Issue. 1, p. 27.


    Hui, C. L. M. Li, Y. K. Li, A. W. Y. Lee, E. H. M. Chang, W. C. Chan, S. K. W. Lam, S. Y. Thornton, A. E. Sham, P. Honer, W. G. and Chen, E. Y. H. 2016. Visual working memory deterioration preceding relapse in psychosis. Psychological Medicine, Vol. 46, Issue. 11, p. 2435.


    Grayson, Ben Adamson, Lisa Harte, Michael Leger, Marianne Marsh, Samuel Piercy, Chloe and Neill, Joanna C. 2014. The involvement of distraction in memory deficits induced by NMDAR antagonism: Relevance to cognitive deficits in schizophrenia. Behavioural Brain Research, Vol. 266, p. 188.


    Goghari, Vina M. MacDonald, Angus W. and Sponheim, Scott R. 2014. Relationship between prefrontal gray matter volumes and working memory performance in schizophrenia: A family study. Schizophrenia Research, Vol. 153, Issue. 1-3, p. 113.


    Thakkar, K. N. and Park, S. 2012. Impaired Passive Maintenance and Spared Manipulation of Internal Representations in Patients With Schizophrenia. Schizophrenia Bulletin, Vol. 38, Issue. 4, p. 787.


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Salience of working-memory maintenance and manipulation deficits in schizophrenia

  • S. K. Hill (a1), G. B. Griffin (a1), T. Kazuto Miura (a2), E. S. Herbener (a1) and J. A. Sweeney (a1)
  • DOI: http://dx.doi.org/10.1017/S003329171000019X
  • Published online: 10 March 2010
Abstract
Background

Encoding and maintenance of information in working memory, followed by internal manipulation of that information for planning adaptive behavior, are two key components of working-memory systems. Both processes have been reported to be impaired in schizophrenia, but few studies have directly compared the relative severity of these abnormalities, or the degree to which manipulation deficits might be secondary to alterations in maintenance processes.

Method

Clinically stable schizophrenia patients (n=25) and a demographically similar healthy comparison group (n=24) were administered a verbal span task with three levels of working-memory load. Maintenance was assessed using sequential position questions. Manipulation processes were assessed by requiring comparison of the relative sequential position of test items, which entailed simultaneous serial search strategies regarding item order.

Results

Both groups showed reduced accuracy and increased reaction time for manipulation compared with maintenance processing. There were significant patient impairments across working-memory loads. There was no differential deficit in manipulation processing, and effect sizes of relative deficit in the patient group were higher for maintenance than manipulation processing.

Conclusions

The strong correlation for maintenance and manipulation deficits suggest that impairments in the ability to internally manipulate information stored in working-memory systems are not greater than alterations in the encoding and maintaining of information in working memory and that disturbances in maintenance processing may contribute to deficits in higher-order working-memory operations.

Copyright
Corresponding author
*Address for correspondence: Dr S. Kristian Hill, Center for Cognitive Medicine, Department of Psychiatry (M/C 913), University of Illinois at Chicago, 912 South Wood Street, Suite 235, Chicago, IL60612, USA. (Email: shill@psych.uic.edu)
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Psychological Medicine
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