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Memory and cognition in schizophrenia.

J Y Guo1,2, J D Ragland3, C S Carter4,5

  • 1Department of Psychiatry and Behavioral Sciences, Imaging Research Center, University of California at Davis, Sacramento, CA, USA. joyce.yu.guo@gmail.com.

Molecular Psychiatry
|September 23, 2018
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Summary
This summary is machine-generated.

Schizophrenia patients exhibit significant episodic memory impairments, particularly in relational memory under high cognitive demand. These deficits stem from impaired dorsolateral prefrontal cortex function, impacting overall cognitive control.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • Episodic memory deficits are a core cognitive feature of schizophrenia (Sz).
  • These deficits are present early in the illness and correlate with functional disability.
  • Previous research indicates Sz patients have disproportionate impairments in relational memory encoding under high cognitive demand.

Purpose of the Study:

  • To investigate specific episodic memory component process deficits in schizophrenia.
  • To examine the neural underpinnings of these memory impairments, focusing on frontal-medial temporal lobe circuits.
  • To contextualize memory deficits within broader cognitive control impairments in schizophrenia.

Main Methods:

  • Utilized experimental cognitive neuroscience approaches.
  • Compared episodic memory performance under high vs. low cognitive demand conditions.
  • Examined neural activation and connectivity within frontal-medial temporal lobe circuits using neuroimaging (implied).

Main Results:

  • Schizophrenia patients showed disproportionate episodic memory impairments under high cognitive demand relational encoding.
  • Performance was relatively unimpaired under item-specific encoding conditions.
  • Deficits correlated with impaired activation and connectivity in dorsolateral prefrontal cortex (DLPFC) and related frontal-medial temporal lobe circuits.

Conclusions:

  • Episodic memory deficits in schizophrenia are specific to certain component processes, particularly relational encoding under cognitive load.
  • These impairments are linked to impaired cognitive control associated with dorsolateral prefrontal cortex dysfunction.
  • Findings have implications for understanding and potentially treating cognitive dysfunction in schizophrenia.