Could you live with half a brain? Some people have. The cerebellum is a small part of the brain by volume, but contains about half of the brain’s neurons. Some people have managed to live their entire lives without a cerebellum. Since the cerebellum handles lots of fine motor control, balance, and more, these people have had trouble walking properly, had slurred speech, trouble with coordination, and more.
But recently, a Chinese woman was found to have lived without a cerebellum. She first stood at 4 years old, and couldn’t walk unaided until she was 7. Her symptoms are not as severe. It seems that her brain grew so that many of the functions of the cerebellum were controlled by other parts of the brain.