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Alcohol and heightened aggression in individual mice
K A Miczek1, H M Barros, L Sakoda
1Department of Psychology, Tufts University, Medford, Massachusetts 02155, USA.
Alcoholism, Clinical and Experimental Research
|December 3, 1998
Summary
Low alcohol doses significantly increase aggressive behavior in 27% of mice, while others show no change or decreased aggression. This alcohol-induced aggression is specific to behavior, not blood alcohol levels.
Area of Science:
- Neuroscience
- Behavioral Pharmacology
- Animal Behavior
Background:
- Individual differences in response to alcohol are significant.
- Alcohol's effects on aggression vary widely among individuals.
Purpose of the Study:
- To investigate individual differences in alcohol's effects on aggressive behavior in mice.
- To identify factors influencing alcohol-induced aggression.
Main Methods:
- Oral administration of low alcohol doses to resident male mice confronting intruders.
- Quantification of aggressive behavior and motor activities.
- Varied housing, feeding, and task conditions across three experiments.
Main Results:
- 27% of mice showed significantly heightened aggression after alcohol (1.0 g/kg), 64% showed no change, and 9% showed decreased aggression.
- Aggression-heightening effects persisted for at least 2 months and were independent of housing or prior task conditioning.
- Alcohol's effects on aggression were dissociated from its effects on operant performance.
Conclusions:
- Alcohol's potentiation of aggressive behavior is specific to certain individuals and the behavior itself.
- This individual specificity offers avenues for neuropharmacological and molecular research into alcohol's behavioral effects.