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From the title I thought this was an extremely unethical experimental technique, but apparently these were people who just happened to have had a hemispherectomy as a child.

Yes unfortunately for them, but at least they are helping the science.

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what about the ones who, as children, had half of their brains incorrectly removed.

OP: commas are important.

> OP: commas are important

I copied-pasted the PR.