Limbic control of aggression in the cat.

Area of Science:

• Neuroscience
• Animal Behavior

Background:

• Decades of research by Flynn and colleagues have identified key limbic circuits modulating aggression and defense in cats.
• These studies focus on the interplay between the basomedial amygdala and ventral hippocampus in regulating predatory and defensive behaviors.

Purpose of the Study:

• To review the network of limbic circuits controlling predatory aggression and defense in cats.
• To summarize findings on stable excitability differences in limbic circuits and their relation to behavioral dispositions.
• To examine the lasting effects of experimentally induced limbic seizures on aggression, defense, and limbic excitability.

Main Methods:

• Review of existing research on feline limbic circuits and aggression/defense.
• Analysis of studies correlating limbic circuit excitability with developmental behavioral traits.
• Examination of the impact of induced limbic seizures on behavior and neural transmission.

Main Results:

• The basomedial amygdala circuit suppresses attack and facilitates defense; the ventral hippocampus circuit facilitates attack.
• Stable differences in limbic circuit excitability are linked to developmental behavioral dispositions.
• Experimentally induced limbic seizures increase defensive disposition and alter neural transmission from the amygdala to the hypothalamus and ventral hippocampus.

Conclusions:

• The balance of attack and defense behaviors is tonically controlled by opposing limbic circuits with inherent biases.
• Adult defensiveness appears to be determined early in development, suggesting a pre-programmed neurodevelopmental process.
• Seizure-induced alterations in limbic excitability mimic naturally occurring differences observed in defensive cats, highlighting the role of limbic system plasticity.