Some people see stimming as a way to cope with understimulation, think of twirling or hand flapping. Pressure vests and weighted blankets, or seeking out busy places like a carnival, are also often mentioned as methods to battle understimulation. I personally see it differently: I think they are ways to deal with overstimulation. That may not seem logical, but if you think back to the Tetris analogy from before: the stimuli caused by stims, physical sensations or crowded places seem to activate a clean-up system that, while processing these self-chosen stimuli, also clears away the unpleasant
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