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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Psychology

Background:

  • Cognitive deficits significantly impact the quality of life and daily functioning of individuals diagnosed with schizophrenia.
  • Understanding the nature and extent of cognitive impairment in schizophrenia is crucial for developing effective interventions.

Purpose of the Study:

  • To systematically review and update the evidence regarding processing speed impairment in schizophrenia.
  • To investigate potential moderating factors, such as clinical and demographic variables, that influence the severity of this cognitive deficit.

Main Methods:

  • A comprehensive literature search was conducted across PubMed and PsycINFO databases (February 2009–November 2023).
  • Included studies involved individuals with schizophrenia and control groups, utilized contemporary diagnostic criteria, and reported data for meta-analysis (Hedges g effect sizes).
  • Data from 115 studies, encompassing 10,114 individuals with schizophrenia and 13,235 controls, were analyzed using random-effects models.

Main Results:

  • Symbol coding tasks, a measure of processing speed, showed substantial impairment in individuals with schizophrenia (Hedges g = -1.52).
  • This processing speed deficit was comparable in magnitude to impairments observed in 15 other cognitive tests.
  • Factors such as intelligence quotient, age differences, sex composition, inpatient status, and comorbid diagnoses (schizoaffective/schizophreniform) significantly moderated the degree of symbol coding impairment.

Conclusions:

  • The findings strongly support processing speed impairment as a central feature of cognitive deficits in schizophrenia.
  • This impairment may be a core consequence of disrupted brain connectivity, a common finding in schizophrenia.
  • These insights are vital for refining our understanding of schizophrenia's cognitive profile and guiding future research and treatment strategies.