Consider that we still don't know how memories are stored and recalled, we don't know how the electrochemical signals transmitted by neurons actually form and maintain thoughts and memories, we don't know what triggers specific intellectual or emotional responses, and we don't know if all brains process concrete or abstract data the same way.
The most we can do is make broad generalizations, ie, "Whatever it is that happens, it mostly happens here."
Until we understand those fundamental questions, we cannot understand how art is processed by the brain. You have to know how the processor in a television works, before you can expect to shoot signals at it and get a coherent image on its screen.
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