Self-stimulatory

Appropriate play with toys was studied in two autistic children with high occurrences of self-stimulatory behavior

Source: wiktionary

Medical culture constrains stimming through strict clinical designations and pathologizing definitions, referring to it as stereotypies or "self-stimulatory behaviours." Autistic people, however, often define stimming more broadly as repetitive sensory practices used to regulate emotional states, to cope with external sensory stimuli, or for purposes of self-expression.

Source: wiktionary