21 of whom were boys and four of whom were girls. As the four children who switched group membership may have shown slightly different profiles compared with their fellow group members, all analyses were rerun excluding these four participants. There was no effect on the pattern of results reported. Table 1 gives z scores for each standardized task for both groups and the results of fully factorial univariate analyses of covariance run on each test; main effects of Group (TD and LLI) and