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Temporal order and spatial memory in schizophrenia: a parametric study.

J C Dreher1, J P Banquet, J F Allilaire

  • 1INSERM U483, University of Paris VI Jussieu, Paris, France. dreherj@intra.nimh.nih.gov

Schizophrenia Research
|August 24, 2001
PubMed
Summary
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Schizophrenia patients show significant deficits in spatial working memory and sequence recall, with impairments worsening with increased task complexity. These working memory issues extend beyond prefrontal cortex dysfunction.

Area of Science:

  • Cognitive Neuroscience
  • Psychiatry

Background:

  • Spatial working memory deficits are documented in schizophrenia.
  • Temporal order memory in schizophrenia remains under-investigated.

Purpose of the Study:

  • To compare and characterize spatial working memory and sequence reproduction deficits in medicated schizophrenia patients.
  • To dissociate encoding, retention, and retrieval processes in working memory.
  • To compare schizophrenia patient performance to that of patients with prefrontal lesions.

Main Methods:

  • Manipulated cues (pattern vs. sequence), delay, set-size, and response type in recall and recognition tasks.
  • Assessed performance in patients with schizophrenia and compared to existing data from patients with prefrontal lesions.

Related Experiment Videos

Main Results:

  • Increased set-size and delay impaired performance in both groups, with greater impact on schizophrenia patients.
  • Schizophrenia patients exhibited retention and retrieval deficits.
  • Impairments were observed in both recall and delayed sequence recognition in schizophrenia patients, unlike prefrontal lesion patients.

Conclusions:

  • Working memory deficits in schizophrenia are not solely attributable to prefrontal dysfunction.
  • Schizophrenia involves broader working memory impairments affecting retention and retrieval, including delayed sequence recognition.