Story perspectives

Brainless Animals Challenge Traditional Ideas of Cognition

11/10/2025

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Summary

Story summary

Researchers are examining cognitive abilities in brainless animals like jellyfish, sea anemones, and hydras, suggesting cognition may occur without a brain.
Box jellyfish can associate visual cues with physical sensations.
Starlet sea anemones can link stimuli and recognize genetically identical neighbors.
Experts Simon Sprecher and Jan Bielecki say these behaviors challenge traditional definitions of thinking.
The debate continues over whether these animals truly think or if their actions are reflexive.

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Story summary

Researchers are examining cognitive abilities in brainless animals like jellyfish, sea anemones, and hydras, suggesting cognition may occur without a brain.
Box jellyfish can associate visual cues with physical sensations.
Starlet sea anemones can link stimuli and recognize genetically identical neighbors.
Experts Simon Sprecher and Jan Bielecki say these behaviors challenge traditional definitions of thinking.
The debate continues over whether these animals truly think or if their actions are reflexive.