Evidence map›Paper›PMID 21873570›Full record

ArticlePsychological science2011

Maternal defense: breast feeding increases aggression by reducing stress.

Jennifer Hahn-Holbrook, Julianne Holt-Lunstad, Colin Holbrook, Sarah M Coyne, E Thomas Lawson

Registry-linked trialOpen access · greenAbstract read
In one paragraph

Article in Psychological science, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT01834261 (Computational Modeling of Oxytocin in the Regulation of Trust), which is not on this map. Cited by 28 papers.

0numbers the graph read from it
0cells of the map it votes in
28citing papers in PubMed
9.9field-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.

NCT01834261 phase1completednot on this mapstarted 2013, after this paper: background citation

Computational Modeling of Oxytocin in the Regulation of Trust

TypeinterventionalSponsorStony Brook UniversityRan2013 to 2015Enrolled51ConditionsBrain Dynamics in Healthy AdultsArmsSyntocinon Nasal Spray, 40IU, Syntocinon Placebo Formulation, 40IU
3 · Its place in the literature

Who cites it

28 citing papers in PubMed, 98 citations in OpenAlex.

  1. Trial
  2. Article
  3. CART Neurons in the Hypothalamic Ventral Premammillary Nucleus (PMv) in Rats Mediate Maternal, But Not Inter-male Aggression.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2025
    Article
  4. Article
  5. Perspectives on psychological science : a journal of the Association for Psychological Science · 2024
    Article
  6. Maternal physiological calming responses to infant suckling at the breast.The journal of physiological sciences : JPS · 2023
    Article
  7. Article
  8. Article
  9. Review
  10. Review
  11. Review
  12. Psychological effects of breastfeeding on children and mothers.Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz · 2018
    Review
  13. Aggression in Women: Behavior, Brain and Hormones.Frontiers in behavioral neuroscience · 2018
    Review
  14. Review
  15. Maternal Competition in Women.Human nature (Hawthorne, N.Y.) · 2017
    Article
  16. Review
  17. Review
  18. Review
  19. Article
  20. Article
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

5 authors at 3 institutions in 2 countries.

Jennifer Hahn-HolbrookDepartment of Psychology, University of California, Los Angeles, CA 90095, USA. jhahn@psych.ucla.edu
Julianne Holt-Lunstad
Colin Holbrook
Sarah M Coyne
E Thomas Lawson
Brigham Young University · USUniversity of California, Los Angeles · USQueen's University Belfast · GB

Funding

PREVENTION RESEARCH TRAINING:URBAN CHILDREN'S MENT HLTHT32MH015750 · NIMH · UNIVERSITY OF CALIFORNIA LOS ANGELES · PI CHRISTINE DUNKEL SCHETTER · 1985 to 2026
$6.2M
NIMH NIH HHS MH15750NIMH NIH HHS T32 MH015750
6 · The paper itself

Abstract

Mothers in numerous species exhibit heightened aggression in defense of their young. This shift typically coincides with the duration of lactation in nonhuman mammals, which suggests that human mothers may display similarly accentuated aggressiveness while breast feeding. Here we report the first behavioral evidence for heightened aggression in lactating humans. Breast-feeding mothers inflicted louder and longer punitive sound bursts on unduly aggressive confederates than did formula-feeding mothers or women who had never been pregnant. Maternal aggression in other mammals is thought to be facilitated by the buffering effect of lactation on stress responses. Consistent with the animal literature, our results showed that while lactating women were aggressing, they exhibited lower systolic blood pressure than did formula-feeding or never-pregnant women while they were aggressing. Mediation analyses indicated that reduced arousal during lactation may disinhibit female aggression. Together, our results highlight the contributions of breast feeding to both protecting infants and buffering maternal stress.

Indexed as

Defense MechanismsAdultAggressionBlood PressureBreast FeedingFemaleHumansInfantLactationMothersStress, PsychologicalYoung Adult

Identifiers

PMID21873570
PMCPMC3345316
OpenAlexW2110571946

What OpenQuestion holds

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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.