[1] NIH, Emot & Dev Branch, Bethesda, MD 20892 USA
[2] Univ N Carolina, Ctr Dev Sci, Chapel Hill, NC USA
[3] Duke Univ, Lab Neurogenet, Durham, NC USA
[4] Univ Michigan, Funct MRI Lab, Ann Arbor, MI 48109 USA
[5] Weill Cornell Med Coll, New York, NY USA
[6] Univ Michigan, Ann Arbor, MI 48109 USA