What SPLIT-BRAIN Experiments Revealed About Consciousness

What SPLIT-BRAIN Experiments Revealed About Consciousness

Research references - https://docs.google.com/document/d/1l...

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Nobel Prize winner Roger Sperry and his student, psychologist Michael Gazzaniga, conducted a series of experiments on "split-brain" patients. Their goal was to understand how this surgery altered the patients' thinking and behavior and what it could reveal about human consciousness.

At first glance, these patients appeared completely normal after the surgery. They could walk, talk, and carry out their daily activities without any noticeable difficulty. However, upon closer observation, strange symptoms began to emerge. Whenever they had to make a decision, something unusual would happen. It was as if one hand wanted to do something, but the other hand, acting independently, would try to stop it, as if it had a mind of its own. There were cases where their left hand would suddenly knock objects out of their right hand. In one experiment, when shown an image, they either claimed to have seen nothing or displayed a puzzling response. In one instance, a patient was shown a hammer on the screen and verbally identified it correctly. However, when asked to draw what they had seen, they sketched a saw instead.

What was happening here? Did splitting the brain also divide their consciousness? If so, did this mean two separate individuals now resided within one body? For them, did the word "I" no longer refer to a single self but rather to "we"? This groundbreaking split-brain research gave both neuroscientists and philosophers a completely new perspective on how we understand the human brain and consciousness.