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Related Experiment Video

Updated: Jan 28, 2026

Modeling the Functional Network for Spatial Navigation in the Human Brain

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Published on: October 13, 2023

Serotonergic Contributions to Human Brain Aggression Networks.

Martin Klasen^1,2, Dhana Wolf^1,2, Patrick D Eisner^1,2

¹Department of Psychiatry, Psychotherapy and Psychosomatics, Faculty of Medicine, RWTH Aachen, Aachen, Germany.

Frontiers in Neuroscience

|March 12, 2019

Summary

Serotonin depletion affects brain connectivity linked to aggression. The monoamine oxidase A (MAOA) gene influences this relationship, particularly in individuals with low-expressing alleles, highlighting genetic vulnerability in aggression.

Keywords:

PFC aggression amygdala serotonin supramarginal gyrus tryptophan depletion

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Area of Science:

Neuroscience
Behavioral Genetics
Psychopharmacology

Background:

Dysfunctional frontolimbic circuits are linked to aggressive behavior.
Serotonin's role in prefrontal-amygdala control is implicated but debated.
The monoamine oxidase A (MAOA) gene may mediate aggression risk, especially low-expressing alleles.

Purpose of the Study:

To investigate how serotonin modulation and MAOA genotype influence amygdala functional connectivity during aggression.
To explore the interplay between serotonin, MAOA genotype, and aggressive behavior.

Main Methods:

38 healthy males underwent acute tryptophan depletion (ATD) or placebo in a double-blind, cross-over design.
Aggressive behavior was modeled using a violent video game during functional magnetic resonance imaging (fMRI).
Trait aggression (Buss-Perry Aggression Questionnaire) and MAOA genotype were assessed.

Main Results:

Acute tryptophan depletion (ATD) reduced aggression-specific amygdala connectivity with the supramarginal gyrus.
ATD's effects on amygdala connectivity were associated with trait aggression and MAOA genotype in prefrontal regions.
Findings suggest serotonergic corticolimbic projections are involved in aggressive behavior.

Conclusions:

Serotonergic pathways in the brain significantly contribute to regulating aggressive behavior.
Frontolimbic circuit vulnerability, influenced by MAOA genotype, may explain heightened aggression risk in specific individuals.
This study clarifies serotonin's role and highlights genetic factors in aggression.