Evidence map›Paper›PMID 19748080›Full record

SynthesisBiological psychiatry2009

A meta-analysis of the corpus callosum in autism.

Thomas W Frazier, Antonio Y Hardan

Registry-linked trialAbstract readMeta-Analysis
In one paragraph

Synthesis in Biological psychiatry, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04119492 (Integrating Brain Imaging and Rehabilitation to Improve Outcomes for Children With Co-occurring DCD & ASD), which is not on this map. Cited by 132 papers.

0numbers the graph read from it
0cells of the map it votes in
132citing papers in PubMed
8.4field-weighted citation impact, top 2% of its field
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.

NCT04119492 naunknown statusnot on this mapstarted 2019, after this paper: background citation

Integrating Brain Imaging and Rehabilitation to Improve Outcomes for Children With Co-occurring DCD & ASD

TypeinterventionalSponsorUniversity of British ColumbiaRan2019 to 2021Enrolled30ConditionsMotor Skills Disorders, Autism Spectrum DisorderArmsCO-OP Treatment Group
3 · Its place in the literature

Who cites it

132 citing papers in PubMed, 267 citations in OpenAlex.

  1. Review
  2. Article
  3. Article
  4. Article
  5. Article
  6. Mef2c Controls Postnatal Callosal Axon Targeting by Regulating Sensitivity to Ephrin Repulsion.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2025
    Article
  7. Implications of draxin in neurological disorders.Frontiers in cell and developmental biology · 2025
    Review
  8. Article
  9. Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Review
  15. Article
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  18. Article
  19. Differential impacts ofFrontiers in neuroscience · 2023
    Article
  20. Sex- and age-dependent contribution of System xFrontiers in behavioral neuroscience · 2023
    Article

72 more citing papers are in PubMed but not listed here.

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

2 authors at 2 institutions in 1 country.

Thomas W FrazierCenter for Autism and Center for Pediatric Behavioral Health, Cleveland Clinic, Cleveland, Ohio 44195, USA. fraziet2@ccf.org
Antonio Y Hardan
Cleveland Clinic · USStanford University · US

Funding

A neuroimaging study of twin pairs with autismR01MH083972 · NIMH · STANFORD UNIVERSITY · PI HARDAN, ANTONIO · 2009 to 2013
$3.1M
NEUROIMAGING/DEVELOPMENTAL NEUROBIOLOGY OF AUTISMK23MH064027 · NIMH · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI HARDAN, ANTONIO YOUSSEF · 2001 to 2005
$834k
NIMH NIH HHS K23 MH064027NIMH NIH HHS MH-083972NIMH NIH HHS MH-64027NIMH NIH HHS R01 MH083972
6 · The paper itself

Abstract

backgroundPrevious magnetic resonance imaging (MRI) studies have reported reductions in corpus callosum (CC) total area and CC regions in individuals with autism. However, studies have differed concerning the magnitude and/or region contributing to CC reductions. The present study determined the significance and magnitude of reductions in CC total and regional area measures in autism.

methodPubMed and PsycINFO databases were searched to identify MRI studies examining corpus callosum area in autism. Ten studies contributed data from 253 patients with autism (mean age = 14.58, SD = 6.00) and 250 healthy control subjects (mean age = 14.47, SD = 5.31). Of these 10 studies, 8 reported area measurements for corpus callosum regions (anterior, mid/body, and posterior), and 6 reported area for Witelson subdivisions. Meta-analytic procedures were used to quantify differences in total and region CC area measurements.

resultsTotal CC area was reduced in autism and the magnitude of the reduction was medium (weighted mean d = .48, 95% confidence interval [CI] = .30-.66). All regions showed reductions in size with the magnitude of the effect decreasing caudally (anterior d = .49, mid/body d = .43, posterior d = .37). Witelson subdivision 3 (rostral body) showed the largest effect, indicating greatest reduction in the region containing premotor/supplementary motor neurons.

conclusionsCorpus callosum reductions are present in autism and support the aberrant connectivity hypothesis. Future diffusion tensor imaging studies examining specific fiber tracts connecting the hemispheres are needed to identify the cortical regions most affected by CC reductions.

Indexed as

AdolescentAutistic DisorderChildCorpus CallosumDatabases, FactualFemaleHumansImage Processing, Computer-AssistedMagnetic Resonance ImagingMale

Identifiers

PMID19748080
PMCPMC2783565
OpenAlexW2030458571

What OpenQuestion holds

Textmetadata
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Read underepoch 390

Registered trials

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.