It seems likely it’s Autism Spectrum Disorders. Vaniver is probably referring to some of these discussions:
http://lesswrong.com/lw/559/autism_and_lesswrong/
http://lesswrong.com/lw/28w/aspergers_poll_results_lw_is_on_the_spectrum/
http://lesswrong.com/lw/28l/do_you_have_highfunctioning_aspergers_syndrome/
It seems likely it’s Autism Spectrum Disorders. Vaniver is probably referring to some of these discussions:
http://lesswrong.com/lw/559/autism_and_lesswrong/
http://lesswrong.com/lw/28w/aspergers_poll_results_lw_is_on_the_spectrum/
http://lesswrong.com/lw/28l/do_you_have_highfunctioning_aspergers_syndrome/