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Fourteen-and 18-month-old infants observed an adult experiencing each of 2 objects (experienced objects) and then leaving the room; the infant then played with a 3rd object while the adult was gone (unexperienced object). The adult interacted with the 2 experienced objects in 1 of 3 ways: by (a) sharing them with the infant in an episode of joint engagement, (b) actively manipulating and inspecting them on his or her own as the infant watched (individual engagement), or (c) looking at them fromdoi:10.1037/0012-16184.108.40.2069 pmid:17352541 fatcat:fnodzkfj6bbsdeqrwn5lgjewey