I advance here a theory (rather amateurish). Communication is possible using tools, modules, organs that in non human animals are separated: a dog can threaten barking, showing teeth and through special postures of the body. These are all connected within a module or organ, or more largely in a part of the brain (in humans there are the left and the right emispheres, they are separated but they interfere, the one into the other). Human communication is made of a mixture of tools that can be used at the same time. Irony, for example, needs, to be understood in what it is, of some form of interpretative schemes. To understand the irony you need to draw both on the left and the right emispheres. The right for the emotional content, the left for the metacommunicative frames to interpret the tone and the real meaning. If someone says to a shabby person “how elegant you are”, this may be a clumsy compliment, or an ironic statement, or just a hypocrite attempt to please. These are threee very different things.
ASD people have problems to decipher the real meaning of ambiguous statements made by others about themselves. They are at odds particularly with irony: I think this fact is the consequence of the difficulty of tackling with different modules at the same time. This, in turn results from the lacking of the so called TOM (theoty of mind), of being uncertain about the intentionality of others. Friend or feud?
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Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better.
--Samuel Beckett