About the Authors

Jeanne A. Guiraud

jeanne_guiraud@hotmail.com

Affiliation Centre for Brain and Cognitive Development, Department of Psychological Science, Birkbeck, University of London, London, United Kingdom

Przemyslaw Tomalski

Affiliation Institute for Research in Child Development, School of Psychology, University of East London, London, United Kingdom

Elena Kushnerenko

Affiliation Institute for Research in Child Development, School of Psychology, University of East London, London, United Kingdom

Helena Ribeiro

Affiliation Centre for Brain and Cognitive Development, Department of Psychological Science, Birkbeck, University of London, London, United Kingdom

Kim Davies

Affiliation Centre for Brain and Cognitive Development, Department of Psychological Science, Birkbeck, University of London, London, United Kingdom

Tony Charman

Affiliation Centre for Research in Autism and Education, Department of Psychology and Human Development, Institute of Education, University of London, London, United Kingdom

Mayada Elsabbagh

Affiliation Centre for Brain and Cognitive Development, Department of Psychological Science, Birkbeck, University of London, London, United Kingdom

Mark H. Johnson

Affiliation Centre for Brain and Cognitive Development, Department of Psychological Science, Birkbeck, University of London, London, United Kingdom

the BASIS Team

Membership of the BASIS Team is provided in the Acknowledgments.

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JG PT EK HR MHJ. Performed the experiments: HR KD. Analyzed the data: JG MHJ. Contributed reagents/materials/analysis tools: PT EK. Wrote the paper: JG. Established and ran the BASIS programme: TC ME MHJ BASIS Team. Recruited and scheduled families: BASIS Team. Provided advice on the study: BASIS Team. Helped interpret data: PT EK ME TC BASIS Team. Contributed to writing the article: PT EK KD TC ME MHJ. Edited the article: HR BASIS Team.