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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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Schizophrenia, a complex psychiatric disorder, has been historically misunderstood. Early psychological theories attributed its origins to childhood trauma and unresponsive parenting. However, contemporary research largely rejects these notions, favoring the vulnerability-stress hypothesis. This model proposes that individuals with a genetic predisposition to schizophrenia may develop the disorder following exposure to significant environmental stressors. Notably, studies on high-risk...
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Antisocial personality disorder is a chronic mental health condition characterized by persistent patterns of disregard for the rights and well-being of others. Individuals with antisocial personality disorder exhibit behaviors that include deceitfulness, impulsivity, irresponsibility, aggression, and a profound lack of empathy. These traits often manifest early in life and persist into adulthood, leading to significant personal, social, and legal consequences.
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The Resident-intruder Paradigm: A Standardized Test for Aggression, Violence and Social Stress
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Why not reduce reactive aggression too?

Antonio Benítez-Burraco1

  • 1Department of Spanish, Linguistics, and Theory of Literature (Linguistics), Faculty of Philology, University of Sevillehttps://ror.org/03yxnpp24, Seville, Spain abenitez8@us.es.

The Behavioral and Brain Sciences
|November 26, 2025
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Summary
This summary is machine-generated.

Primate social grooming and reduced aggression help groups grow larger and more cohesive. Neurobiological links between grooming and aggression support this evolutionary trend in primate social behavior.

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Area of Science:

  • Primate social behavior
  • Neuroethology
  • Evolutionary biology

Background:

  • Social grooming is a key factor in primate group cohesion and size.
  • Reduced reactive aggression may also facilitate larger, more stable primate societies.

Purpose of the Study:

  • To explore the relationship between social grooming and reactive aggression in primates.
  • To investigate the neurobiological underpinnings connecting grooming and aggression.

Main Methods:

  • Comparative analysis of primate social structures.
  • Neurobiological studies examining neural pathways involved in grooming and aggression.

Main Results:

  • Grooming significantly correlates with increased primate group size and cohesion.
  • Evidence suggests a partial overlap in the neurobiology of grooming and reactive aggression.

Conclusions:

  • Both social grooming and diminished reactive aggression are crucial for primate social evolution.
  • Understanding the shared neurobiology provides insights into primate social dynamics.