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Cutting the brain in half can create two minds that disagree.

ConsciousnessEstablished

To treat severe epilepsy, some patients had the bridge between their brain's halves cut. Roger Sperry's experiments, which won a Nobel Prize in 1981, showed each half could see, know and want different things.

Truth label: Established. Strong evidence and broad agreement among experts.

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Two hands, two wills

Some patients described one hand buttoning a shirt while the other unbuttoned it.

The storyteller

When the speaking half did not know why the other half acted, it confidently made up a reason.

Learn

  1. What it suggests. Our sense of being one unified self may be something the brain builds, not something fixed.

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Who won a Nobel Prize for split-brain research?

Roger Sperry. Sperry shared the 1981 Nobel Prize.

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