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I don't think stimming impairs functioning.
This study is interesting in that respect:
http://download.springer.com/static/pdf/869/art%253A10.1007%252FBF01531586.pdf?auth66=1391725000_6e88e597d4bf0ca5b481c1c1ea4a8e95&ext=.pdfThey studied compared six low-functioning autistic kids, three who had no speech at all (mute) and three who were echolalic. (The echolalic kids also had better overall functioning than the mute kids.) All six kids engaged in a lot of stimming.
They tried to teach each child a simple task, to hand the experimenter a particular shape and not the other one (eg hand him the square, not the circle). The same shape was rewarded each time. The researchers first tried to teach the kids the task without making any effort to stop them stimming. If they didn't learn it, then they tried again, this time stopping the kid whenever they caught the kid stimming.
Among the echolalic kids, all of them learned the task without the experimenter suppressing stimming. Two kids reduced stimming of their own accord, and the third refrained from stimming only when the experimenter was giving a command.
Among the mute kids, however, none of them learned the task in the first phase. However, when the experimenter stopped them from stimming, they all learned the task. This suggests they may learn more poorly when they're stimming at the same time.
Of course, we don't know this for sure. Since the 'stimming suppressed' condition took place after the 'no suppression' condition, it could just be that the mute kids took longer to learn the task and the stimming manipulation made no difference. However, they didn't show any improvement in scores over time in the 'no suppression' condition, so it seems likely that they did need stimming to be suppressed to learn the task.
This suggests that stimming impairs functioning for some kids, but not others.
I know some forms of stimming can be harmful, but I think there is a tendency to pathologize
anything that is not considered normal, and claiming it will interfere with learning without taking into consideration the possibility that there may be profound reasons for the behavior and trying to understand it more before using cruel techniques to stop it.