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Twin study of laboratory-induced aggression.
Bojana M Dinić1, Snežana Smederevac1, Selka Sadiković1
1Department of Psychology, Faculty of Philosophy, University of Novi Sad, Novi Sad, Serbia.
Aggressive Behavior
|July 14, 2020
Summary
Aggression is influenced by environment, not genetics. Shared and nonshared environmental factors explain initial aggression levels, while nonshared factors alone impact changes due to provocation.
Area of Science:
- Behavioral genetics
- Psychology
Background:
- Aggressive behavior is a complex trait.
- Understanding the interplay of genetic and environmental influences is crucial.
Purpose of the Study:
- To investigate genetic and environmental contributions to laboratory-induced aggression.
- To differentiate influences on baseline aggression versus aggression under provocation.
Main Methods:
- Utilized the Competitive Reaction Time Task for aggression induction.
- Analyzed data from 478 adult twins (316 monozygotic) to assess heritability and environmental influences.
Main Results:
- Initial aggression levels were influenced by both shared (45%) and nonshared (55%) environmental factors.
- Changes in aggression with increased provocation were solely attributed to nonshared environmental factors (100%).
- No significant genetic influence was found on laboratory-induced aggression.
Conclusions:
- Environmental factors play a critical role in shaping aggressive behavior.
- Situation-specific aggressive responses are particularly sensitive to nonshared environmental influences.
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