In the April 7th New Scientist, an interview with Michael Barton (“Mapping the language minefield for kids with autism” by Alison George), leading with:
Why do people with autism, like yourself, find the English language so confusing? Autistic people think in black and white and therefore interpret everything literally. Ordinary people seem to love using idioms, metaphors and figurative speech, whether to aid communication or simply to make life more interesting, whereas for autistic people they simply make no sense.