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07], number of days between testing sessions [F(1,42) = 2.28; p = 0.14], or age [F(1,42) = 0.05; p = 0.82] on word-learning performance, so we collapsed across these variables in all of the analyses reported here. Finally, Oxygenase we did not include object familiarity in our analyses as parents rated an average of less than one object (out of 6) as highly familiar to their child. There were also no significant differences in level of familiarity between conditions [highly familiar: Mcausal = 0.38, Mnon-causal = 0.29, t(46) = 0.48; p = 0.63; minimally familiar: Mcausal = 1.21, Mnon-causal = 0.75, t(46) = 1.46; p = 0.15], suggesting familiarity did not significantly influence performance. We began by tabulating, for each child, the proportion of test trials on which they identified the correct referent during the first and second testing sessions. One sample t-tests showed average performance was above chance in both conditions during both testing sessions (ps find more including Condition (Causal vs. Non-Causal) as a between subject factor and Session (first vs. second) as a within subject factor (see Figure ?Figure22) revealed a significant main effect of Session, F(1,46) = 6.79; p = 0.01, d = 0.34, reflecting overall better word-learning performance in the second than in the first session. This main effect of Session was further qualified by a significant interaction with Condition, F(1,46) = 4.21; p = 0.046. We therefore proceeded to compare the two experimental conditions at each measurement time point. No difference in performance was observed during Session 1 (M = 0.52, SE = 0.05 vs. M = 0.51, SE = 0.05). However, children were able to identify the referents of more words in the Causal (M = 0.66, SE = 0.04) than the Non-Causal (M = 0.53, SE = 0.04) NU7441 nmr condition when tested again in Session 2, t(46) = 2.14; p = 0.04, d = 0.62. This difference was mirrored in a non-parametric analysis. More children in the Causal condition (n = 17) than in the Non-Causal condition (n = 9) responded correctly on more than half of the test trials in Session 2, Fisher��s exact p