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If you google psycho-physiological effect shivers, you'll get some studies that relate. Basically it sounds like when you have a spike of intense arousal, you can get a psychosomatic effect resulting in shivers. Possibly from the vestigial flight or fight response in raising your hairs to make you look bigger, but that's a guess.
And ya I get it too, occationally. For me it usually has to do with some truth I had been trying to define, and finding some tidbit of wisdom that clears it up.
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