stim
v.— «We call these things “stims,” for self-stimulatory behavior. His need to obsess over things in ritualistic ways is not unlike the seeming need of young deaf or blind people to move their heads or sway.» —“The Invisible Boy; A Skittish World Misses the True Beauty of Our Autistic Son” by Lana Hurt Washington Post (C5) Aug. 11, 1991. (source: Double-Tongued Dictionary)