“…Common ground information guides how infants produce non-verbal gestures and interpret ambiguous utterances (Bohn, Zimmermann, Call, & Tomasello, 2018;Saylor, Ganea, & Vázquez, 2011). For slightly older children, common ground -in the form of knowledge about discourse novelty, preferences, and even discourse expectations -also facilitates word learning (Akhtar, Carpenter, & Tomasello, 1996;Saylor, Sabbagh, Fortuna, & Troseth, 2009;Sullivan, Boucher, Kiefer, Williams, & Barner, 2019).…”