There's two types of stims: endogenous and exogenous.
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Endogenous stims don't require anything else. Rubbing fingers together, making noises, slapping bellies, etc.
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Exogenous stims require stuff: fiddling with bits of plastic, scratching a fingernail over a piece of fabric, etc
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The difference in stimming methods, indicates whether the person is hypo/hypersensitive in some areas.
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A person who endogenously stims by, say, rubbing the thumb's fingernail against the pad of the index finger, likely is hyposensitive
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They probably have a cartoonishly high pain tolerance, and may have a hard time noticing bumps & bruises.
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A person who exogenously stims by, say, scratching a fingernail against stretched fabric, is likely going to be hypersensitive.
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They may find noisy places extremely difficult, etc.
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Note a person's stims over a day, and see which are endogenous or exogenous. That ratio will be unique to each person.
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That ratio will describe the boundaries of areas in which they're hypo/hyper-sensitive, which may seem contradictory.
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I stim so much on my fingers that they're calloused and do much on my hair that in snaps off. 
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