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Group-level trajectories of Picture Naming accuracy (ACC: left) and response time (RT: right) for Vietnamese and English based on multivariate models with the two languages as response variables and age as the predictor. Standard errors for group trajectories are shaded gray. For ACC, Vietnamese and English were unequal in both intercepts and slopes. For RT, Vietnamese and English intercepts were unequal, while slopes were equal. See Table 4 for estimates of fixed effects.
