Like someone else said I don’t think it’s a universal phenomenon since I very rarely have every seen it in real life. It could come from stimming; physical movements or other forms of tics that people with autism or other sensory processing issues will commonly repeat when distressed or in pain. It’s sort of like a distraction method to help the brain focus attention somewhere else. I don’t have anything to back that up but it’s the only similar thing i can think of.
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