Guppy Shoals with Larger Telencephalons Show Faster and More Coordinated Decision-Making

A recent study conducted by Boussard et al. has revealed that guppy shoals with larger telencephalon sizes demonstrate a significantly faster decision-making ability compared to their counterparts. The research focused on the collective behavior of fish shoals, examining how brain size influences their capacity to respond quickly in group settings when confronted with external stimuli.

The study specifically analyzed guppies selectively bred for larger telencephalons, a region of the brain associated with cognitive functions such as learning and decision-making. Researchers observed that these groups exhibited quicker and more coordinated responses during decision-making tasks compared to shoals with smaller telencephalons. The findings provide new insights into the relationship between brain structure and collective behavior in animals, highlighting how neurological traits can influence group dynamics in species like guppies.

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Date: January 25, 2026

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GOAI