gwern comments on Harry Potter and the Methods of Rationality discussion thread, part 18, chapter 87 - Less Wrong Discussion
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Bella, Voldemort, Obliviation backlash, half of St. Mungo's parents, Cruciatus... if they don't suffer brain damage, Eliezer has gone against quite a bit in canon.
I think Izeinwinter was asking whether physical damage to the brain causes mental damage in wizards, not whether there's any way to cause mental damage (where "mental damage" is distinct from "brain damage" if wizard's minds aren't actually running in their brains).
Oh. Hm... is anyone physically knocked unconscious at any point? That would seem to satisfy the criteria: a non-magical thing that affects only the physical brain but which causes negative effects on the mind.
We can find in "Quidditch Through the Ages", which can be assumed to be canon, this lovely poem:
What if Bludgers, being modelled after naive physics, have inherent knocking-people-out property? Wouldn't that be in line with how canon is being dealt with in HPMOR?
Very improbable; in Canon, they break bones in extremities all the time.
Bludgers are still magical and therefore could still "get at" the 'mind' regardless of the physical brain.