I’ve just heard a podcast talking about this if anyone is interested:

More or Less: Behind the Stats: Bonus episode: The Autism Curve

Episode webpage: http://www.bbc.co.uk/programmes/p0l7zfjv

Media file: http://open.live.bbc.co.uk/mediaselector/6/redir/version/2.0/mediaset/audio-nondrm-download-rss/proto/http/vpid/p0l7zdx1.mp3