Coordination and persistence of aggressive visual communication in Siamese fighting fish

Area of Science:

• Neuroethology
• Animal Behavior
• Social Neuroscience

Background:

• Limited understanding of neural mechanisms underlying social interaction coordination beyond acoustic communication.
• Investigating how the brain drives engagement in social interactions is crucial for understanding social behavior.

Purpose of the Study:

• To identify dynamic visual features and behavioral sequences driving turn-taking aggressive behavior in Siamese fighting fish.
• To elucidate the neural basis of social interaction coordination and persistent engagement.

Main Methods:

• Observation of Siamese fighting fish (Betta splendens) during aggressive interactions.
• Lesion studies targeting the telencephalon and caudal dorsomedial telencephalon (cDm).
• Analysis of neural activity in ventral telencephalic regions and the thalamic preglomerular complex.

Main Results:

• Dynamic visual cues and behavioral sequences were identified as drivers of turn-taking aggressive behavior.
• Telencephalon lesions impaired persistent participation but not turn-taking coordination.
• Lesions of the caudal dorsomedial telencephalon (cDm) mimicked telencephalic effects, with increased activity observed in projecting regions.

Conclusions:

• Dynamic visual cues regulate the rhythm of social interactions across multiple timescales.
• The vertebrate pallial amygdala plays a conserved role in regulating the persistence of emotional states and social engagement.