Cited by 1,130Schizophrenia research and treatmentMental Health and PsychiatryDementia and Cognitive Impairment Research

Neurocognition in first-episode schizophrenia: a meta-analytic review.

Mesholam-Gately, Raquelle I., Giuliano, Anthony J., Goff, Kirsten P., Faraone, Stephen V., Seidman, Larry J.·2009·Neuropsychology

Abstract

Compromised neurocognition is a core feature of schizophrenia. Following Heinrichs and Zakzanis's (1998) seminal meta-analysis of middle-aged and predominantly chronic schizophrenia samples, the aim of this study is to provide a meta-analysis of neurocognitive findings from 47 studies of first-episode (FE) schizophrenia published through October 2007. The meta-analysis uses 43 separate samples of 2,204 FE patients with a mean age of 25.5 and 2,775 largely age- and gender-matched control participants. FE samples demonstrated medium-to-large impairments across 10 neurocognitive domains (mean effect sizes from -0.64 to -1.20). Findings indicate that impairments are reliably and broadly present by the FE, approach or match the degree of deficit shown in well-established illness, and are maximal in immediate verbal memory and processing speed. Larger IQ impairments in the FE compared to the premorbid period, but comparable to later phases of illness suggests deterioration between premorbid and FE phases followed by deficit stability at the group level. Considerable heterogeneity of effect sizes across studies, however, underscores variability in manifestations of the illness and a need for improved reporting of sample characteristics to support moderator variable analyses.

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Crossref · 10.1037/a0014708

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Authors
Mesholam-Gately, R. I., Giuliano, A. J., Goff, K. P., Faraone, S. V., & Seidman, L. J.
Affiliations
  • Beth Israel Deaconess Medical Center (US)
  • SUNY Upstate Medical University (US)
Venue
Neuropsychology
Published
2009
Volume
23
Issue
3
Pages
315-336
ISSN
  • 0894-4105 (ISSN-L)
  • 1931-1559
OpenAlex
W1987834520
Cited by
1,130
References
133
Citations by year
2026: 29 · 2025: 43 · 2024: 52 · 2023: 54 · 2022: 56 · 2021: 73 · 2020: 74 · 2019: 103 · 2018: 88 · 2017: 79 · 2016: 66 · 2015: 88 · 2014: 74 · 2013: 84 · 2012: 66
FWCI
34.11
Type
journal article
Language
en
Open access
closed
Locations
  • Neuropsychology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Alliance for Research on Schizophrenia and Depression
  • National Institute of Mental Health (P50MH080272, MH 43518; MH 63951; MH 65562)
  • Department of Mental Health Research
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
  • Social Sciences › Arts and Humanities › Philosophy › Mental Health and Psychiatry
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
first-episode schizophrenia, neurocognitive function, cognitive impairment, verbal memory, processing speed, IQ decline, premorbid intelligence, effect size heterogeneity
MeSH terms
Adult, Cognition Disorders, Humans, Intelligence, Memory, Neuropsychological Tests, Schizophrenia, Schizophrenic Psychology, Time Factors, Verbal Learning

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