“…In particular, children begin to acquire morecomplex forms of false-belief understanding (Perner & Wimmer, 1985), they become more proficient in interpreting complex social situations (Baron-Cohen, O'Riordan, Stone, Jones, & Plaisted, 1999;Bosacki & Astington, 1999;Devine & Hughes, 2013;Happé, 1994), and they improve their ability to interpret mental states and emotions from facial expressions (Baron-Cohen, Wheelwright, Hill, Raste, & Plumb, 2001). Many of these aspects of advanced ToM (AToM) are closely linked to children's social competences, including feelings of loneliness or the ability to form friendships (Bosacki, Moreira, Sitnik, Andrews, & Talwar, 2020;Caputi, Cugnata, & Brombin, 2020;Devine, White, Ensor, & Hughes, 2016;Fink, Begeer, Peterson, Slaughter, & de Rosnay, 2015;Koerber & Osterhaus, 2020;Slaughter, Imuta, Peterson, & Henry, 2015). Despite its relevance for children's everyday experiences, there is a paucity of longitudinal work that narrowly tracks the development of AToM in middle childhood across multiple time points and over extensive periods of time.…”