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Things like this have happened in people too. E.g. https://www.newscientist.com/article/dn12301-man-with-tiny-b... and https://www.irishtimes.com/news/remarkable-story-of-maths-ge...

Gwern has a good summary, including criticisms: https://www.gwern.net/Hydrocephalus

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Similarly the story of Noah Wall, The parents of a boy born with only 2 percent of his brain have spoken out about their son's "extraordinary" development.

Shelly and his father Rob Wall spoke of how their six-year-old son has since gained function in 80 percent of his brain. [1]

[1] https://www.newsweek.com/miracle-boy-born-no-brain-grows-bac...

I remember seeing a journal article decades ago: Is the Brain Necessary? I don't remember any other details, only that due to some condition, only a thin shell of active matter remained.

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