I always thought so because I can temporarily play the part of a living "statue" well.
Also, I was pretty sure I must be good at controlling them because none of my old reports so far mention repetitive motor mannerism - besides head-banging which they highlight as "auto-aggressive behaviour". About the head-banging: they figured it had/has nothing to do with my autism because I high IQ and that somehow means that I won't engage in stims that could be harmful to me without meaning to cause myself pain or injury. (And no, I guess that doesn't need to make sense.)
Anyway. When keeping very still, I will rhythmically wriggle my toes in my shoes (if I have shoes on), engage in a light form of my finger wriggling/flapping (possibly in my pockets or under the table when I am making an effort to keep still), tap my fingers rhythmically, trace lines, hum, so on... I figured that yes, these are stims despite that a fair share of ASD specialists fail to notice them and others and therefore claim that I do not seem to have autistic stims.
I can control my stims in another way usually/when I am calm and focussed - controlling meaning that I can substitute at least a few of the stims for some others.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett