“…Before 6 months of age, children later diagnosed with autism did not seem to differ from their typically developing peers in overt social behaviours (Elsabbagh et al, 2014;Landa and Garrett-Mayer, 2006;Ozonoff et al, 2010;Rozga et al, 2011;Young et al, 2009;Zwaigenbaum et al, 2005), giving the impression that the initial development of these infants might be intact. However, recent research suggests an array of atypical signs related to, and, beyond the social domain detectable by 6 months in infants who later develop autism (e.g., oculo-motor functions, motor behaviour, visual perception, vocalizations, and their underlying neural structure and functions; Bhat et al, 2012;Bosl et al, 2018;Brisson et al, 2014;Einspieler et al, 2014;Estes et al, 2015;Iverson et al, 2019;Jones and Klin, 2013;Paul et al, 2011;Wolff et al, 2012). Notably, observable social behaviours (e.g., orienting toward or scanning of socially relevant audio and visual information) that appear similar between young infants with and without ASD may rely on disparate neural mechanisms (e.g., Blasi et al, 2015;Braukmann et al, 2018;Elsabbagh et al, 2012;Lloyd-Fox et al, 2018).…”