Evidence map›Paper›PMID 29559529›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2018

Neuron numbers increase in the human amygdala from birth to adulthood, but not in autism.

Thomas A Avino, Nicole Barger, Martha V Vargas, Erin L Carlson, David G Amaral, Melissa D Bauman, Cynthia M Schumann

Abstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 107 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
107citing papers in PubMed, 1 pooled it
–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

107 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Article
  3. Article
  4. The Amygdala and Politics.Brain sciences · 2026
    Review
  5. Disrupted maternal care alters neural-microglia interactions in the primate paralaminar (PL) nucleus of the amygdala.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2026
    Article
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  12. Review
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  19. A Shared Threat-Anticipation Circuit Is Dynamically Engaged at Different Moments by Certain and Uncertain Threat.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2025
    Article
  20. Article

47 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

7 authors.

Thomas A AvinoDepartment of Psychiatry and Behavioral Sciences, UC Davis MIND Institute, School of Medicine, University of California, Davis, Sacramento, CA 95817.ORCID 0000-0002-3114-6817
Nicole BargerDepartment of Psychiatry and Behavioral Sciences, UC Davis MIND Institute, School of Medicine, University of California, Davis, Sacramento, CA 95817.
Martha V VargasDepartment of Psychiatry and Behavioral Sciences, UC Davis MIND Institute, School of Medicine, University of California, Davis, Sacramento, CA 95817.
Erin L CarlsonDepartment of Psychiatry and Behavioral Sciences, UC Davis MIND Institute, School of Medicine, University of California, Davis, Sacramento, CA 95817.
David G AmaralDepartment of Psychiatry and Behavioral Sciences, UC Davis MIND Institute, School of Medicine, University of California, Davis, Sacramento, CA 95817.
Melissa D BaumanDepartment of Psychiatry and Behavioral Sciences, UC Davis MIND Institute, School of Medicine, University of California, Davis, Sacramento, CA 95817.
Cynthia M SchumannDepartment of Psychiatry and Behavioral Sciences, UC Davis MIND Institute, School of Medicine, University of California, Davis, Sacramento, CA 95817; cschumann@ucdavis.edu.

Funding

National Institute on Aging (NIA) ColonyP51OD011107 · OD · UNIVERSITY OF CALIFORNIA AT DAVIS · PI Simon J. Atkinson · 2012 to 2026
$191.5M
Rodent Behavior CoreU54HD079125 · NICHD · UNIVERSITY OF CALIFORNIA AT DAVIS · PI OZONOFF, SALLY · 2013 to 2019
$8.5M
Interdisciplinary Training for Autism Researchers(RMI)T32MH073124 · NIMH · UNIVERSITY OF CALIFORNIA DAVIS · PI Stephen Charles Noctor, Christine Wu Nordahl · 2004 to 2026
$6.8M
ANATOMY OF THE PRIMATE AMYGDALOID COMPLEXR01MH041479 · NIMH · UNIVERSITY OF CALIFORNIA DAVIS · PI AMARAL, DAVID G · 1986 to 2010
$4.5M
Typical and Pathological Cellular Development of the Human AmygdalaR01MH097236 · NIMH · UNIVERSITY OF CALIFORNIA AT DAVIS · PI SCHUMANN, CYNTHIA · 2011 to 2022
$3.9M
ANATOMY OF THE PRIMATE AMYGDALOID COMPLEXR37MH041479 · NIMH · UNIVERSITY OF CALIFORNIA DAVIS · PI AMARAL, DAVID G · 1989 to 1998
–
NICHD NIH HHS U54 HD079125NIH HHS P51 OD011107NIMH NIH HHS R01 MH041479NIMH NIH HHS R01 MH097236NIMH NIH HHS R37 MH041479NIMH NIH HHS T32 MH073124
6 · The paper itself

Abstract

Remarkably little is known about the postnatal cellular development of the human amygdala. It plays a central role in mediating emotional behavior and has an unusually protracted development well into adulthood, increasing in size by 40% from youth to adulthood. Variation from this typical neurodevelopmental trajectory could have profound implications on normal emotional development. We report the results of a stereological analysis of the number of neurons in amygdala nuclei of 52 human brains ranging from 2 to 48 years of age [24 neurotypical and 28 autism spectrum disorder (ASD)]. In neurotypical development, the number of mature neurons in the basal and accessory basal nuclei increases from childhood to adulthood, coinciding with a decrease of immature neurons within the paralaminar nucleus. Individuals with ASD, in contrast, show an initial excess of amygdala neurons during childhood, followed by a reduction in adulthood across nuclei. We propose that there is a long-term contribution of mature neurons from the paralaminar nucleus to other nuclei of the neurotypical human amygdala and that this growth trajectory may be altered in ASD, potentially underlying the volumetric changes detected in ASD and other neurodevelopmental or neuropsychiatric disorders.

Indexed as

AdolescentAdultAmygdalaAutistic DisorderCase-Control StudiesCells, CulturedChildChild, PreschoolCohort StudiesFemaleHumansMaleNeuronsYoung Adultamygdalaautismneuroanatomyneuronal maturationstereology

Identifiers

PMID29559529
PMCPMC5889677

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Registered trials

None linked

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.