[1] Univ Cambridge, Dept Psychiat, Autism Res Ctr, Cambridge CB2 2AH, England
[2] Univ Cambridge, Dept Expt Psychol, Autism Res Ctr, Cambridge CB2 2AH, England
[3] Univ Texas, SW Med Ctr, Dept Psychiat, Dallas, TX 75390 USA
[4] Univ Illinois, Beckman Inst, Urbana, IL 61801 USA
[5] Univ Calif San Diego, Div Biol Sci, Neurobiol Sect, La Jolla, CA 92093 USA
[6] Univ Calif San Diego, Dept Neurosci, La Jolla, CA 92093 USA
[7] Univ Washington, Dept Psychiat & Behav Sci, Seattle, WA 98195 USA