Well if most with autism could imitate, they wouldn't have autism, so I doubt this study would lead anyone to tell autistic people to imitate normal behaviour unless they do not know what autism is which these researchers do. (I guess I have a lot of trust into human understanding.)
Nobody can think it would be that simple.
There's no study needed to figure out that autism impairs some aspects of imitation. Because if we were fully capable to imitation, then we'd all be normal anyway or would learn to be normal if in an autism-friendly environment. But autism doesn't have anything to do with choosing to be different, it means being different forever no matter whether what you'd rather be like because you cannot do normal imitation.
(Note: there may be some on the spectrum who do not have the impaired imitation thingy, I believe the autistic spectrum has become so wide that there's anything possible these days)
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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