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Humans engage in aggression when they seek to cause harm or pain to another person. Aggression takes two forms depending on one’s motives: hostile or instrumental. Hostile aggression is motivated by feelings of anger with intent to cause pain; a fight in a bar with a stranger is an example of hostile aggression. In contrast, instrumental aggression is motivated by achieving a goal and does not necessarily involve intent to cause pain (Berkowitz, 1993); a contract killer who murders for...
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The amygdala is a small, almond-shaped structure responsible for processing and storing memories, particularly those linked to emotions like fear and stress. It plays an essential role in the brain's response to emotionally significant events and often enhances memory formation by triggering stress hormone release. The amygdala is vital for encoding and retrieving memories associated with fear or stress, a process that is adaptive by helping organisms avoid dangerous situations.
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Primary Motives: Sleep, Sex, and Pain Avoidance01:24

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Primary motives such as sleep, sex, and pain avoidance are crucial drivers of behavior in humans and animals. These motives ensure survival, reproductive success, and overall well-being by prompting actions that meet essential bodily needs.
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The hypothalamus is a small yet highly complex and essential brain region that plays a crucial role in regulating various bodily functions. Anatomically, it is located at the base of the brain, just above the brainstem and below the thalamus, forming part of the limbic system.
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A hypothalamic-amygdala circuit underlying sexually dimorphic aggression.

Zhenggang Zhu1, Lu Miao1, Kaiyuan Li1

  • 1Department of Neurology of Second Affiliated Hospital and School of Brain Science and Brain Medicine, Zhejiang University School of Medicine, Hangzhou 310058, China; Liangzhu Laboratory, MOE Frontier Science Center for Brain Science & Brain-Machine Integration, State Key Laboratory of Brain-Machine Intelligence, Zhejiang University, Hangzhou 311121, China; NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University, Hangzhou 310058, China.

Neuron
|July 17, 2024
PubMed
Summary
This summary is machine-generated.

Researchers discovered a specific brain circuit that explains why male mice are more aggressive than females. This neural pathway involves distinct excitatory and inhibitory connections, revealing a key mechanism behind sex-based aggression differences.

Keywords:
GABAergic neuronsVMHvlaggressionexcitation-inhibition balancefemaleposterior substantia innominatasexual dimorphismsexual monomorphism

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Neurobiology

Background:

  • Sexual dimorphism in aggression is common in many species.
  • The precise neural mechanisms driving sex-based differences in aggression are not fully understood.
  • The hypothalamus and amygdala are key brain regions implicated in aggression.

Purpose of the Study:

  • To identify the specific neural circuit responsible for male-biased aggression in mice.
  • To elucidate the role of hypothalamic-amygdala pathways in sex differences in aggression.

Main Methods:

  • Investigated projections from the ventrolateral ventromedial hypothalamus (VMHvl) to the posterior substantia innominata (pSI) in mice.
  • Examined both excitatory and inhibitory connections within this circuit.
  • Analyzed how these connections differ between male and female mice.

Main Results:

  • Identified a hypothalamic-amygdala circuit (VMHvl-pSI) mediating male aggression.
  • Found that excitatory VMHvl-pSI projections are strengthened in males, promoting aggression.
  • Observed that inhibitory connections are strengthened in females, reducing aggression.
  • Demonstrated that this leads to heightened pSI activity in males, driving male-biased aggression.

Conclusions:

  • A sexually distinct balance of excitation and inhibition in the VMHvl-pSI circuit underlies sex differences in aggression.
  • This circuit provides a neural basis for male-biased aggression.
  • Understanding this circuit offers insights into the neurobiology of sex differences in behavior.