Socially-mediated activation in the snake social-decision-making network.

Area of Science:

• Neuroscience
• Comparative Psychology
• Zoology

Background:

• The social-decision-making network (SDN) is crucial for social behaviors and is conserved across species.
• Reptilian SDN function remains largely unexplored, despite snakes possessing advanced social perception.
• Snakes exhibit a limited range of social behaviors, making them ideal for studying basal SDN functions.

Purpose of the Study:

• To investigate the functioning of the SDN in reptiles, specifically in ball pythons (Python regius).
• To identify brain regions activated during social interactions in snakes.
• To compare snake SDN activation with that observed in other taxa.

Main Methods:

• Ball pythons were housed with a same-sex conspecific for one hour.
• Neural activation was assessed using Fos immunoreactivity.
• Fos counts were compared between socially interacting snakes and controls.

Main Results:

• Social interaction increased Fos counts in key SDN areas, including the medial amygdala, preoptic area, nucleus accumbens, and basolateral amygdala.
• Differential Fos immunoreactivity was observed in the ventral amygdala, suggesting a role in inter-brain area communication.
• Sex differences in Fos counts were noted in several social brain regions, potentially linked to male competition.
• No differences in Fos counts were found in early sensory processing structures like the vomeronasal organ.

Conclusions:

• The study reveals conserved SDN activation patterns in ball pythons, offering insights into basal vertebrate social behavior.
• Findings suggest that the snake SDN supports fundamental social perception and decision-making processes.
• The research highlights the utility of snakes for understanding the evolutionary underpinnings of social behavior.