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Related Concept Videos

Aggression01:47

Aggression

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 hire...
McNemar's Test01:23

McNemar's Test

McNemar's Test is a nonparametric statistical test used to determine if there is a significant difference in proportions between two related groups when the outcome is binary (e.g., yes/no, success/failure). It is beneficial when we have paired data, such as pre-test/post-test designs, where the same subjects are measured under two different conditions. The test is named after the statistician Quinn McNemar, who introduced it in 1947. It is commonly used in situations where subjects are...
Wald-Wolfowitz Runs Test II01:17

Wald-Wolfowitz Runs Test II

The Wald-Wolfowitz runs test, commonly referred to as the runs test, is a nonparametric test used to assess the randomness of ordered data. The test evaluates the number of runs, which are consecutive sequences of similar elements within the data. If the number of runs is significantly higher or lower than expected, the data is considered non-random, indicating a detectable pattern or structure.
For binary data, runs are identified using symbols such as + and −, or equivalently, 1s and 0s. In...

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Updated: Jun 3, 2026

The Resident-intruder Paradigm: A Standardized Test for Aggression, Violence and Social Stress
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Aggressiveness and size: a model and two tests.

David M Logue1, April D Takahashi, William H Cade

  • 1Departamento de Biología, Universidad de Puerto Rico, Carr. 108 Barrio Miradero Km 1.3 Entrada al Zoológico, Mayagüez, PR 00681-9000, Puerto Rico. david.logue@upr.edu

The American Naturalist
|April 5, 2011
PubMed
Summary
This summary is machine-generated.

Animal aggression varies with body size. A new model predicts intermediate sizes benefit most from aggression. Experiments with Madagascar hissing cockroaches confirm this, showing intermediate-sized males are most aggressive.

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Area of Science:

  • Behavioral Ecology
  • Evolutionary Biology
  • Animal Behavior

Background:

  • Individual variation in animal aggression is common.
  • Adaptive covariation between body size and aggressive behavior is a potential explanation.
  • Previous models have not fully explored the relationship between body size and the benefits of aggression.

Purpose of the Study:

  • To develop a model predicting the benefits of aggressiveness as a function of body size.
  • To test the model's prediction that intermediate-sized individuals exhibit optimal aggression.
  • To investigate the role of body size in mediating aggressive behavior in Madagascar hissing cockroaches.

Main Methods:

  • Developed a theoretical model linking body size to the benefits of aggression.
  • Used disembodied antennae from male Madagascar hissing cockroaches (Gromphadorhina portentosa) to assay aggressive responses.
  • Recorded male aggressive responses to antennae of varying sizes.
  • Validated the antenna assay by comparing its results with actual male-male interactions.

Main Results:

  • The model predicted that intermediate body sizes would yield the greatest benefits from aggression.
  • Aggressive responses were weaker to antennae from larger males, indicating size perception.
  • After accounting for size perception, aggressiveness peaked at intermediate sizes in the antenna assay.
  • Data from actual male-male interactions supported the model's prediction and validated the antenna assay.

Conclusions:

  • Adaptive covariation between body size and aggressiveness explains interindividual variation in aggressive behavior.
  • Intermediate-sized individuals are predicted to be more aggressive due to optimal benefits.
  • Body size is a significant factor influencing the evolution and expression of animal aggression.