Look into Bernard Rimland. There's a whole self-contained theory, but there's no evidentiary basis for any of it.
You might like the Creation of Doctor B, which goes into the life of Bruno Bettelheim, it explains why Rimland, a total crank, gained the political capital he had to spread this crap.
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You might like the Creation of Doctor B, which goes into the life of Bruno Bettelheim, it explains why Rimland, a total crank, gained the political capital he had to spread this crap.