Figure 3. Performance on the new items in the 3 age-groups.

Group average performance in 10 consecutive practice sessions, the 15^th session, and a retention session (R) in eight-year-olds (8-y-o), 12-year-olds (12-y-o) and young adults (adults). Judgment (left panels) and speech production (right panels) tasks. Accuracy (% correct) - top panels; speed [RT (ms)] - bottom panels. Error bars  =  standard errors.