Within Reason #116 Peter Godfrey Smith - Animal Consciousness: What Can We Know?
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Aug 10, 2025 
Peter Godfrey-Smith is an Australian philosopher of science and a professor at the University of Sydney, known for his insights into the evolution of cognition. He delves into the fascinating world of octopus consciousness, comparing their decentralized brains to human cognition. The discussion challenges ideas about pain perception and animal welfare, specifically considering shrimp and their ethical implications. Godfrey-Smith also explores panpsychism, questioning if everything possesses some form of consciousness, and highlights the complexities of animal experiences.
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The Donut-Shaped Octopus Brain
- An octopus brain is surprisingly arranged, partly like a donut with the esophagus through the middle.
- Its optic lobes sit behind each eye and a vertical lobe sits between them, supporting complex behavior.
Arms Hold Most Octopus Neurons
- Much of an octopus's nervous tissue sits in its arms; they contain over half its neurons.
- Arms show partial autonomy, creating a mix of decentralized and central control.
Octopus Can Visually Control One Arm
- Tamar So Gutnick's experiment showed octopuses can learn to direct a single arm visually to a target out of water.
- Observers still see arms 'messing around' when not performing targeted tasks, suggesting autonomy.
