“…In contrast, there was a gradual increase in the dual use of hands across the three cohorts, suggesting that NSL may be converging on this particular device for indicating temporal overlap between two events. The use of simultaneous constructions to convey temporal information has been observed in a number of other sign languages, including ASL, British Sign Language, Danish Sign Language, Irish Sign Language, and Quebec Sign Language (Emmorey, 2002; Engberg-Pedersen, 1993, 1994; Leeson & Saeed, 2002; Liddell, 2003; Miller, 1994; Morgan, 2002; Rathmann, 2005). Simultaneous constructions may prove to be a sign language universal, taking advantage of the capacity for simultaneity in the manual modality, in contrast to the strict linearization required by vocal production (e.g., Emmorey, 1995; Padden, 1988; Perniss, 2007).…”