You Are Two | Summary and Q&A

TL;DR

Split-brain patients reveal that the brain is composed of two separate entities that coexist within a single body.

Key Insights

• ↔️ The brain's left and right hemispheres each control half of the body's functions.
• 🗨️ Split-brain patients show that the left hemisphere, with its speech center, is dominant in conscious communication.
• 😶 The right hemisphere remains mute but can still perform complex tasks.

Transcript

Your brain is two brains. Two hemispheres each doing half the work of being you. Half your vision goes to each and half your movement directed by each. Right controls left and left controls right. Your two brains co-ordinate through a wire of nerves, but this wire can be cut, and was, for a time, used as an epilepsy treatment. After the cut, people... Read More

Questions & Answers

Q: How does the split brain affect communication abilities in patients?

The split brain surgery causes a disconnect between the two hemispheres, resulting in speech dominance by the left hemisphere and rendering the right hemisphere unable to communicate verbally. However, the right hemisphere can still understand certain stimuli and control actions.

Q: Can split-brain patients recognize familiar faces?

No, the left hemisphere, which controls the ability to recognize faces, is unable to communicate with the right hemisphere. Therefore, split-brain patients cannot identify friends and family members in a crowd.

Q: Does the split brain phenomenon affect decision-making and free will?

The left brain, which controls speech, often creates plausible but incorrect explanations for the actions initiated by the right brain. This raises doubts about the concept of free will, as the left brain tends to retrospectively justify its own behaviors.

Q: How does the split brain surgery affect overall consciousness?

The split brain surgery does not result in a separate consciousness for each hemisphere. Instead, it reveals that consciousness can be experienced independently by each hemisphere, even though the left hemisphere dominates conscious communication.

Summary & Key Takeaways

• The brain is divided into two hemispheres, with each hemisphere controlling half of the body's functions.

• Split-brain patients, who have undergone a surgery that disconnects the two hemispheres, exhibit peculiar behaviors and experiences.

• The left hemisphere, where the speech center is located, dominates conscious communication, while the right hemisphere remains mute but can still perform complex tasks.