Larval Navigation:
The Philosophical Thesis: Sensorimotor Brain Evolution
neuroscientist Rodolfo Llinás and philosopher Daniel Dennett famously observed that the juvenile sea squirt swims through the ocean seeking a home, guided by a cerebral ganglion, light-sensitive ocellus, and gravity-sensing otolith.
"That tunicates 'eat their brain' upon settling is dramatic evidence that brains evolved exclusively for motor control and active prediction. Once movement ends, a neural brain becomes a useless metabolic liability."
When the larva anchors to a rock, it undergoes rapid metamorphosis: resorbing its tail, sensory organs, and 80%+ of its central nervous ganglion. By discarding motor prediction, its energy expenditure drops by 85.7%.
Metabolic Telemetry
LARVA (FREE-SWIMMING)
Neural Ganglion Cells
300
Metabolic Rate
4.20 cal/hr
Sensory Hardware
Otolith + Ocellus
Energy Savings
0.0%
Counterfactual: Keep Complex Brain Attached?
Metamorphic Resorption Engine
1. Sensory Navigation: Seeking light/gravity substrate anchor...
2. Notochord & Tail Motor Resorption
3. Ocellus & Otolith Apoptosis
4. Cerebral Ganglion Auto-Digestion
5. Sessile Siphon Filter-Feeding Transformation
State Result Summary
Larva is active and predicting motor vectors in open water.