Hypothalamic control of male aggression-seeking behavior

Area of Science:

• Neuroscience
• Behavioral Biology
• Ethology

Background:

• Aggression is a complex behavior observed in many species.
• While neural circuits for threat-induced aggression are known, mechanisms for voluntary aggression-seeking are unclear.
• The ventrolateral part of the ventromedial hypothalamus (VMHvl) is implicated in attack behavior.

Purpose of the Study:

• To investigate the neural mechanisms underlying voluntary aggression-seeking behavior in the absence of threat cues.
• To determine the role of the VMHvl in initiating and regulating aggression-seeking actions.

Main Methods:

• Developed an aggression-seeking task where male mice self-initiated attack opportunities.
• Utilized single-unit electrophysiology and population optical recording to monitor VMHvl neural activity.
• Employed VMHvl inactivation and optogenetic stimulation to assess behavioral effects.

Main Results:

• VMHvl activity was essential for aggression-seeking and tracked learning and extinction.
• Inactivating the VMHvl reduced aggression-seeking behavior.
• Optogenetic stimulation of the VMHvl increased aggression-seeking and future attack intensity.

Conclusions:

• The VMHvl plays a critical role in mediating voluntary aggression-seeking behavior.
• VMHvl activity supports not only acute attack but also the flexible seeking of aggressive encounters.
• These findings elucidate the neural basis for proactive aggression.