Maybe because people would like to think they have more brain power than they really experience? My roommate might subscribe to this, as he often appears to attempt to physically "jump start" his brain when he experiences a "tip of the tounge" problem. If he can't think of a word or mispronounces something more than one time, he hits himself in the head hard enough to create a good thunk. As time has gone on, I think this has caused his brain to function worse.
10% isn't half bad, though. If you can still sustain the functions required to live on that, you're doing good.
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