In the dawn days of science fiction, alien invaders would occasionally kidnap a girl in a torn dress and carry her off for intended ravishing, as lovingly depicted on many ancient magazine covers. Oddly enough, the aliens never go after men in torn shirts.

Would a non-humanoid alien, with a different evolutionary history and evolutionary psychology, sexually desire a human female? It seems rather unlikely. To put it mildly.

People don't make mistakes like that by deliberately reasoning: "All possible minds are likely to be wired pretty much the same way, therefore a bug-eyed monster will find human females attractive." Probably the artist did not even think to ask whether an alien perceives human females as attractive. Instead, a human female in a torn dress is sexy—inherently so, as an intrinsic property.

They who went astray did not think about the alien's evolutionary history; they focused on the woman's torn dress. If the dress were not torn, the woman would be less sexy; the alien monster doesn't enter into it.

Apparently we instinctively represent Sexiness as a direct attribute of the Woman object, Woman.sexiness, like Woman.height or Woman.weight.

If your brain uses that data structure, or something metaphorically similar to it, then from the inside it feels like sexiness is an inherent property of the woman, not a property of the alien looking at the woman. Since the woman is attractive, the alien monster will be attracted to her—isn't that logical?

E. T. Jaynes used the term Mind Projection Fallacy to denote the error of projecting your own mind's properties into the external world. Jaynes, as a late grand master of the Bayesian Conspiracy, was most concerned with the mistreatment of probabilities as inherent properties of objects, rather than states of partial knowledge in some particular mind. More about this shortly.

But the Mind Projection Fallacy generalizes as an error. It is in the argument over the real meaning of the word sound, and in the magazine cover of the monster carrying off a woman in the torn dress, and Kant's declaration that space by its very nature is flat, and Hume's definition of a priori ideas as those "discoverable by the mere operation of thought, without dependence on what is anywhere existent in the universe"...

(Incidentally, I once read an SF story ab...

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