Seeing the world from a Solipsistic viewpoint is indeed very common to those on the Autistic Spectrum. Whilst I don't think that the majority of Aspies believe that theirs is the only mind in existance, many of us tend to act as though we are the only feeling, sentient beings in the world. This I think stems largely from a Solipsistic inability to relate to other people possessing thoughts and feelings. I think Aspies and high functiong Auties are aware that there are other people around them, and can believe that these people also have feelings if it is pointed out to them, but perhaps this concept and consideration of other people and their needs comes less naturally. For those with lower funtioning Autism, the difficulty or inability to percieve other people's existance can be quite pronounced. I have a little Autie friend who is four years old. Whilst she can recognise and name people she knows well, such as family, she has a tendancy to treat them as objects rather than people! If you are sitting between her and her juice, she will make a beeline for the juice and will climb over you rather than walking around. Although she is young, this is markedly different from other kids.
In other words, yes!
Out of interest, is it that you believe that yours is the only mind in existance, or is it just that by default, you tend not to take into account other people's consciousness?
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...though fire may burn & flames envelop me, I will arise from the ashes...