The conclusions they reached were that the autistic participants weren't "more rational in general in every way in approaching every situation" however much some might like to stretch it to mean that.
The conclusions reached were, that the autistic participants were more likely to pay attention to the numbers involved, than to the emotional charges surrounding words like "gain" and "loss" of money that were framing the situation.
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"There are things you need not know of, though you live and die in vain,
There are souls more sick of pleasure than you are sick of pain"
--G. K. Chesterton, The Aristocrat