Cited by 105Functional Brain Connectivity StudiesNeural and Behavioral Psychology StudiesAdvanced Neuroimaging Techniques and Applications

The DOI matches its Crossref record; 86 of the 86 references it cites were found in a registry or an index; 6 of the 92 sources its claims cite were checked for support.

Developmental sex differences in resting state functional connectivity of amygdala sub-regions

Open access

Abstract

During adolescence, considerable social and biological changes occur that interact with functional brain maturation, some of which are sex-specific. The amygdala is one brain area that has displayed sexual dimorphism, specifically in socio-affective (superficial amygdala [SFA]), stress (centromedial amygdala [CMA]), and learning and memory (basolateral amygdala [BLA]) processing. The amygdala has also been implicated in mood and anxiety disorders which display sex-specific features, most prominently observed during adolescence. Using functional magnetic resonance imaging (fMRI), the present study examined the interaction of age and sex on resting state functional connectivity (RSFC) of amygdala sub-regions, BLA and SFA, in a sample of healthy adolescents between the ages 10 and 16 years (n = 122, 71 boys). Whole-brain, voxel-wise partial correlation analyses were conducted to determine RSFC of bilateral BLA and SFA seed regions, created using the Eickhoff-Zilles maximum probability maps based on cytoarchitectonic mapping and FMRIB's Integrated Registration and Segmentation Tool (FIRST). Monte Carlo simulation was implemented to correct for multiple comparisons (threshold of 53 contiguous voxels with a z-value ≥ 2.25). Results indicated that with increasing age, there was a corresponding decrease in RSFC between both amygdala sub-regions and parieto-occipital cortices, with a concurrent increase in RSFC with medial prefrontal cortex (mPFC). Specifically, boys and girls demonstrated increased coupling of mPFC and left and right SFA with age, respectively; however, neither sex showed increased connectivity between mPFC and BLA, which could indicate relative immaturity of fronto-limbic networks that is similar across sex. A dissociation in connectivity between BLA- and SFA-parieto-occipital RSFC emerged, in which girls had weaker negative RSFC between SFA and parieto-occipital regions and boys had weaker negative RSFC of BLA and parieto-occipital regions with increased age, both standing in contrast to adult patterns of amygdala sub-regional RSFC. The present findings suggest relative immaturity of amygdala sub-regional RSFC with parieto-occipital cortices during adolescence, with unique patterns in both sexes that may support memory and socio-affective processing in boys and girls, respectively. Understanding the underlying normative functional architecture of brain networks associated with the amygdala during adolescence may better inform future research of the neural features associated with increased risk for internalizing psychopathology.

Overview

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Written from the paper’s full text.

TL;DR

This fMRI study tested whether age and sex interact in resting-state functional connectivity of basolateral and superficial amygdala subregions in 122 healthy adolescents aged 10–16. It reports sex-specific developmental shifts in amygdala coupling with parieto-occipital and medial prefrontal regions, suggesting different maturational timing for BLA- and SFA-based networks.

Key findings

  • Across age, both BLA and SFA showed weaker connectivity with parieto-occipital cortices and stronger connectivity with mPFC, but the direction of change differed by sex.
  • Girls showed a shift from positive to negative BLA–parieto-occipital connectivity with age, whereas boys showed the reverse, with both shifting around age 14; for SFA–parieto-occipital connectivity, boys became more negative and girls more positive with age.
  • mPFC coupling was lateralized by sex: boys showed increased left SFA–left vmPFC connectivity with age, while girls showed increased right SFA–dmPFC connectivity; neither sex showed increased mPFC–BLA coupling.
  • Adding puberty as a covariate did not significantly change the connectivity results (all r² ≥ 0.52, p ≤ 0.001).

Methods

  • Cross-sectional sample of 122 adolescents (71 boys), ages 10–16, without current DSM-IV psychiatric disorders, significant substance use, neurological illness, or other exclusionary conditions; scanned at 3T with two resting-state fMRI runs.
  • Amygdala subregion ROIs were defined by intersecting Eickhoff-Zilles maximum probability maps with FIRST-based segmentation; BLA and SFA were analyzed, while CMA was excluded because many participants had zero or very few CMA voxels (BLA mean voxel count 905.1 ± 232.4; SFA 180.8 ± 85.6; CMA 0.9 ± 2.2).
  • Whole-brain voxel-wise partial correlations modeled age, sex, sex-by-age, and residual framewise displacement; Monte Carlo correction used 53 contiguous voxels at z ≥ 2.25. Post-hoc models added puberty as a covariate.

Limitations

  • The paper states that the cross-sectional design cannot capture developmental change or causal effects, that CMA could not be reliably analyzed, that the puberty measure had only modest agreement with clinician or Tanner assessments, and that a supplementary motion-censoring analysis was consistent but some effects became trend-like.
  • The paper also notes the lack of adult comparison data, which limits conclusions about whether the observed adolescent patterns represent immature or transitional connectivity.
  • Evident from the text: the sample is healthy and restricted to ages 10–16, and the authors describe behavioral and clinical interpretations as speculative because no direct behavioral or psychopathology outcomes were tested.

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Integrity signals

Registry

Crossref · 10.1016/j.neuroimage.2015.04.013

Cites

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41 Not checked yet · 40 Own result · 12 Own interpretation · 6 Own method · 2 Supported · 1 Partly supported · 1 No basis given · accuracy not yet measured

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  • It may state two separate claims as one. 46
  • Probably not a substantial claim. 31
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  • The paper relies on this without support.

    Cytoarchitectonic maps based on adult samples may not be representative of adolescent populations.

    “Although cytoarchitectonic maps are precise microstructural tools, they are based on adult samples that may not be representative of adolescent populations.”
  • The paper relies on this without support.

    An imbalance in maturity of frontal and limbic brain regions is likely insufficient to explain the range of behavior in adolescents.

    “An imbalance in maturity of frontal and limbic brain regions is likely insufficient, however, to explain the range of behavior in adolescents.”
  • The paper relies on this without support.

    Sex differences may be obscured when collapsing data across a variety of developmental stages.

    “however, sex differences may be obscured when collapsing data across a variety of developmental stages.”
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Metadata

Authors
Alarcón, G., Cservenka, A., Rudolph, M. D., Fair, D. A., & Nagel, B. J.
Affiliations
Oregon Health & Science University (US)
Corresponding author
Nagel, Bonnie J.
Venue
NeuroImage
Publisher
Elsevier BV
Published
2015-07
Volume
115
Pages
235-244
ISSN
1053-8119 (ISSN-L)
OpenAlex
W2018473894
Cited by
105
References
86
Citations by year
2026: 6 · 2025: 7 · 2024: 10 · 2023: 4 · 2022: 12 · 2021: 11 · 2020: 9 · 2019: 10 · 2018: 15 · 2017: 10 · 2016: 8 · 2015: 3
FWCI
7.22
Type
journal article
Language
en
Open access
Locations
  • NeuroImage (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute on Alcohol Abuse and Alcoholism (R01 AA017664, T32 AA007468-24)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
Keywords
resting-state functional connectivity, basolateral amygdala, superficial amygdala, sex differences, adolescence, brain maturation, medial prefrontal cortex, parieto-occipital cortex, fronto-limbic network, memory processes, sex differences in brain development, anxiety disorders, mood disorders
MeSH terms
Adolescent, Aging, Amygdala, Brain Mapping, Cerebral Cortex, Child, Female, Humans, Image Processing, Computer-Assisted, Intelligence, Magnetic Resonance Imaging, Male, Neural Pathways, Puberty, Reference Values, Rest, Sex Characteristics

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