1. Ellen Ridley, Centre for Neurodiversity & Development, Durham University, and Department of Psychology, Durham University, Durham, DH1 3LE, UK
2. Bronia Arnott, Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, NE2 4AX, UK
3. Deborah M. Riby, Centre for Neurodiversity & Development, Durham University, and Department of Psychology, Durham University, Durham, DH1 3LE, UK
4. D. Michael Burt, Department of Psychology, Durham University, Durham, DH1 3LE, UK
5. Mary Hanley, Centre for Neurodiversity & Development, Durham University, and Department of Psychology, Durham University, Durham, DH1 3LE, UK
6. Susan R. Leekam, Cardiff University Centre for Developmental Science, Cardiff University, Park Place, Cardiff, Wales, CF10 3AT, UK