“…In addition, although signs serve the same communicative functions as words, they are based on manual movement; Numerous imitation studies demonstrate infants' ability to learn a sequence of movement from a screen (Barr & Hayne, ; Barr, Muentener, & Garcia, ; Barr, Muentener, Garcia, Fujimoto, et al., ; Barr, Shuck, Salerno, Atkinson, & Linebarger, ; Barr & Wyss, ; Hayne, Herbert, & Simcock, ; Meltzoff, , ; Strouse & Troseth, ). Furthermore, verbal labels, included in the elicited production task, may have served as reminders for the movements (Barr & Wyss, ; Hayne & Herbert, ; Khu, Graham, & Ganea, ). Although signs did serve as labels in this context, it may be that this manual form of labeling is easier to learn from the screen than is verbal labeling.…”