Evidence map›Paper›PMID 35251943›Full record

ArticleSchizophrenia research. Cognition2022

A systematic review of premorbid cognitive functioning and its timing of onset in schizophrenia spectrum disorders.

Caroline Ranem Mohn-Haugen, Christine Mohn, Frank Larøi, Charlotte M Teigset, Merete Glenne Øie, Bjørn Rishovd Rund

Abstract read
In one paragraph

Article in Schizophrenia research. Cognition, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers.

0numbers the graph read from it
0cells of the map it votes in
19citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

19 citing papers in PubMed.

  1. Whole brain grey matter synaptic terminal density, age and intellectual functioning in schizophrenia: an in vivo [Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology · 2026
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Caroline Ranem Mohn-HaugenResearch Department, Vestre Viken Hospital Trust, 3004 Drammen, Norway.
Christine MohnNorment Centre, Institute of Clinical Medicine, University of Oslo, P.O. box 4956, Nydalen, 0424 Oslo, Norway.
Frank LarøiDepartment of Psychology, P. O. box 1094, Blindern, University of Oslo, 0317 Oslo, Norway.
Charlotte M TeigsetResearch Department, Vestre Viken Hospital Trust, 3004 Drammen, Norway.
Merete Glenne ØieDepartment of Psychology, P. O. box 1094, Blindern, University of Oslo, 0317 Oslo, Norway.
Bjørn Rishovd RundResearch Department, Vestre Viken Hospital Trust, 3004 Drammen, Norway.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Cognitive impairments are core features of established schizophrenia spectrum disorders (SSD). However, it remains unclear whether specific cognitive functions are differentially impaired pre-onset and at what age these impairments can be detected. The purpose of this review was to elucidate these issues through a systematic summary of results from longitudinal studies investigating impairment in specific cognitive domains as antecedents of SSD. Relevant studies were identified by electronic and manual literature searches and included any original study of cognitive domains any time pre-onset of SSDs that included a control group. Effect sizes were calculated by domain for studies comparing high-risk participants who developed SSD with those who did not. The strongest evidence for impairment pre-onset was for mental processing speed, verbal learning and memory, executive function, and social cognition. Some verbal impairments, like language abilities at age 3 and verbal learning and memory at age 7, may develop as static deficits. Conversely, some non-verbal impairments, like mental processing speed, visuospatial abilities, and visual working memory manifest as developmental lag and become significant later in life. Most effect sizes were small to moderate, except for verbal fluency (d' = 0,85), implying this impairment as central in high-risk participants who develop SSD. The present review documents extensive cognitive impairments pre-onset of SSD, and that these impairments start early in life, in line with the neurodevelopmental hypothesis of schizophrenia. Increased knowledge about cognitive impairments preonset can provide a better basis for understanding the complex pathogenesis of SSD as well as informing cognitive remediation programs.

Indexed as

CognitionOnset of cognitive impairmentPremorbid cognitive functionSchizophreniaSchizophrenia spectrum disorders

Identifiers

PMID35251943
PMCPMC8892142

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.