αυτοδιέγερση → self-stimulation, self-stimulatory behaviour, self-stimulatory behavior, stimming, self-excitation, self-energization, self-energisation
Self-stimulatory behaviour, also known as stimming and self-stimulation, is the repetition of physical movements, sounds, words, or moving objects. Such behaviours (also scientifically known as 'stereotypies') are found to some degree in all people, especially those with developmental disabilities and are especially frequent in people on the autism spectrum. People diagnosed with sensory processing disorder are also known to potentially exhibit stimming behaviours. Stimming has been interpreted as a protective response to over-stimulation, in which people calm themselves by blocking less predictable environmental stimuli, to which they have a heightened sensitivity. A further explanation views stimming as a way to relieve anxiety and other negative or heightened emotions.
Stimming - Wikipedia