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Correspondence and requests for materials should be addressed to W.J. (warren.jones@emory.edu) or J.N.C. (constantino@wustl.edu)
See publication for full list of contributions.
We thank the families and children for their participation.
We thank Erika Mortenson, Sayli Sant, Teddi Gray, Yi Zhang, Laura Campbell, Leena Malik, Alyna Khan and Elizabeth McGarry for data collection and analysis; Andrew C. Heath and Arpana Agrawal for discussions of data analysis and statistics; Caroline Drain and Deborah Hopper for project coordination and data collection; Dejan Jovanovic and Rade Todorovic for contributions to twin family ascertainment; Megan Panther for administrative support; and Steve Kovar, Jose Paredes, and Maria Ly for designing and building the eye-tracking laboratory.
The authors declare no competing financial interests.
Epidemiologic ascertainment of twins was made possible by the Missouri Family Register, a joint program of Washington University and the Missouri Department of Health and Senior Services.
Authorization to access was approved by the MO DHSS Institutional Review Board (Sharon Ayers, Chair) under auspices of the project entitled, Early Quantitative Characterization of Reciprocal Social Behavior.
Research was supported by grants from the National Institute of Child Health & Human Development, HD068479 (JNC) and U54 HD087011 (Intellectual and Developmental Disabilities Research Center at Washington University, JNC PI); and by the National Institute of Mental Health, MH100019 (NM) and MH100029 (AK, WJ). Additional support provided by the Marcus Foundation, the Whitehead Foundation, and the Georgia Research Alliance.
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