Cited by 267Autism Spectrum Disorder ResearchGenetics and Neurodevelopmental DisordersFetal and Pediatric Neurological Disorders

The DOI matches its Crossref record; 71 of the 73 references it cites were found in a registry or an index; none of the 45 sources its claims cite is checked for support yet.

A Meta-Analysis of the Corpus Callosum in Autism

Open access
Frazier, Thomas W., Hardan, Antonio Y.·2009·Biological Psychiatry

Abstract

Background Several previous MRI studies have reported reductions in corpus callosum (CC) total area and CC regions in individuals with autism. However, studies have differed concerning the presence, magnitude, and/or region contributing to CC reductions. The primary aim of the present study was to determine the significance and magnitude of reduction in CC total and regional area measures in patients with autism. Method PubMed 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 controls (M age=14.47, sd=5.31). Of these ten studies, eight reported area measurements for corpus callosum regions (anterior, mid/body, and posterior), with six studies reported area for Witelson subdivisions. Meta-analytic procedures were used to quantify autism versus healthy control differences in total and region CC area measurements. Demographics and study characteristics were examined as moderators of total CC area. Results Total CC area was reduced in autism and the magnitude of the reduction was medium (Weighted Mean d=.48, 95% 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 sub-division 3 (rostral body) showed the largest effect, indicating greatest reduction in the region containing pre-/supplementary motor neurons. Conclusions CC 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.

Overview

Integrity signals

Registry

Crossref · 10.1016/j.biopsych.2009.07.022

Cites

71 of 71 references verified0 citation errors · 0 not checkable

Statistics

9 tests recomputed · 0 with the reported and recomputed p on opposite sides of .05

Verification

Claims the paper makes

19 Own result · 17 Not checked yet · 8 Own method · 4 Own interpretation

Verify all 45 references — free account

Show all 25 claims

  • It may state two separate claims as one. 16
  • Probably not a substantial claim. 9
23 of 23
  • The paper relies on this without support.

    Pre-/supplementary motor regions are crucial for motor planning.

    “Pre-/supplementary motor regions are crucial for motor planning and disruption of these regions may be the neural substrate for impairments in fine motor skills and imitation observed in autism.”
  • The paper relies on this without support.

    The samples in the included studies are representative of the broader population of individuals with autism.

    “CC reductions are present in autism and support the aberrant connectivity hypothesis.”
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Each is checked against this paper’s own text: does it say what the citing paper says it does?

Statistics that don’t add up

Each reported p-value recomputed from its test statistic and degrees of freedom.

2 of 2

Statistics recomputed

Every reported test result, recomputed from its test statistic and degrees of freedom. A result shows as not adding up only once an independent check has confirmed it.

  • Doesn’t add upz = 3.07reported p < .001 · recomputed p = .002

    “z = 3.07, p < .001”

  • Doesn’t add upt(4) = 1.95reported p = .112 · recomputed p = .123

    “t(4)=1.95, p = .112”

  • Consistentz = 5.17reported p < .0001 · recomputed p < .001

    “(z = 5.17, p < .0001”

  • ConsistentF(1, 7) = 3.23reported p = .115 · recomputed p = .115

    “F(1,7)=3.23, p = .115”

  • ConsistentF(5, 4) = 15.76reported p = .01 · recomputed p = .010

    “F(5,4)=15.76, p = .010”

  • Consistentt(4) = 4.32reported p = .012 · recomputed p = .012

    “t(4)=4.32, p = .012”

  • Consistentt(4) = 2.68reported p = .055 · recomputed p = .055

    “t(4)=2.68, p = .055”

  • Consistentt(8) = 3.26reported p = .012 · recomputed p = .012

    “t(8)=3.26, p = .012”

  • Consistentt(8) = 1.43reported p = .192 · recomputed p = .191

    “t(8)=1.43, p = .192”

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Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

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Metadata

Authors
Frazier, T. W., & Hardan, A. Y.
Affiliations
  • Cleveland Clinic (US)
  • Stanford Medicine (US)
Corresponding author
Frazier, Thomas W.
Venue
Biological Psychiatry
Publisher
Elsevier BV
Published
2009-11
Volume
66
Issue
10
Pages
935-941
ISSN
0006-3223 (ISSN-L)
OpenAlex
W2030458571
Cited by
267
References
73
Citations by year
2026: 6 · 2025: 5 · 2024: 11 · 2023: 15 · 2022: 14 · 2021: 18 · 2020: 16 · 2019: 18 · 2018: 11 · 2017: 19 · 2016: 17 · 2015: 22 · 2014: 15 · 2013: 20 · 2012: 27
FWCI
1.51
Type
journal article
Language
en
Open access
Locations
  • Biological Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Mental Health (K23MH064027, MH-64027, R01MH083972, MH-083972)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Fetal and Pediatric Neurological Disorders
Keywords
autism spectrum disorder, corpus callosum
MeSH terms
Adolescent, Autistic Disorder, Child, Corpus Callosum, Female, Humans, Image Processing, Computer-Assisted, Magnetic Resonance Imaging, Male, Databases, Factual

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