Empathy and prosocial behavior powered by orexin-driven theta oscillations

Area of Science:

• Neuroscience
• Behavioral Neuroscience
• Social Neuroscience

Background:

• Empathy and observational fear in rodents are linked to anterior cingulate cortex (ACC) theta oscillations.
• Upstream circuits and the precise role of these oscillations in empathy remain unclear.

Purpose of the Study:

• To investigate the circuit mechanisms modulating ACC theta oscillations during empathy-related behaviors.
• To determine the role of these oscillations in translating affective empathy into prosocial action.

Main Methods:

• Utilized observational fear conditioning and prosocial allogrooming paradigms in mice.
• Recorded neural activity, specifically theta oscillations in the ACC.
• Employed optogenetics to inhibit lateral hypothalamic orexinergic inputs to the ACC in a gaze-dependent manner.

Main Results:

• ACC theta oscillations were found to be involved in empathy-driven prosocial allogrooming.
• Orexinergic neurons in the ACC showed selective activation during observational fear and prosocial allogrooming following prior fear experience.
• Inhibition of hypothalamic orexinergic inputs to the ACC reduced theta power and suppressed both observational fear and prosocial behaviors.

Conclusions:

• Hypothalamic orexinergic inputs are critical for driving ACC theta oscillations.
• These oscillations, modulated by orexinergic signaling, play a key role in observational fear and prosocial behaviors.
• The study provides circuit-level insights into the neural basis of affective empathy and its expression as prosocial action.