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Stimming (also known as self-stimulating) is a common sensory-seeking neurodivergent behaviour. It means stimulating yourself in a repetitive manner to self-soothe, regulate, or express excitement. Stimming is common both in ADHD and autism.
Stimming movements, however, are common in all human beings. Everybody stims, whether it's chewing the end of a pencil while you think, swaying back and forth to the rhythm of the music while you're standing in line, or swinging your legs when they can't touch the ground.