“…In controlled laboratory settings, it has also been shown that learners could acquire and generalize word subclass knowledge if such subclasses were systematically marked by meaning or form similarities. In contrast, arbitrary categories were not acquireable (Braine, 1987;Braine, Brody, Brooks, Sudhalter, Ross, Catalano, & Fisch, 1990;Brooks, Braine, Catalano, Brody, & Sudhalter, 1993). For example, Brooks et al taught learners an artificial language containing two noun subclasses.…”