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A by-subject random intercept and a by-subject random slope of IndexS3 were included as well without assuming a correlation between them12. The likelihood ratio tests between this model and another model with either one of the main effects excluded revealed that both main effects of IndexS3 and SeqType were statistically significant: bIndexS3 = 1.301, SEIndexS3 = 0.490, ��(1)2=4.44, p = 0.035; bSeqType = ?5.855, SESeqType = 1.252, ��(1)2=17.20, p [http://www.selleckchem.com/products/PD-98059.html Selleck PD98059] continuations for each word in Sequence 2 than in Sequence 1. For example, 4 is followed by 1 or 2 in Sequence 1 while it is followed by 1, 2, or 3 in Sequence 2. This means that, after the training phase, a bigram model predicts higher average prediction accuracy in Sequence 1 than in Sequence 2 as observed. However, the bigram model cannot explain the observed trial-level prediction accuracies. Consider a bigram model that updates conditional probabilities after processing every word and consider what [http://www.selleckchem.com/products/Decitabine.html Decitabine nmr] will happen when the model processes an S3. Whenever the model processes a T42, P(2|4) increases and P(1|4) decreases. Thus, when the model experiences a string of several T42's, as it does in an S3, the accuracy should steadily increase across these and then should plummet on the final T41. The observed pattern is very different from this: the first T42 and the T41 in the first S3 have high average accuracies (near 75%) while the second T42 average accuracy is 19% (see Supplementary Figure 1). We tested whether the prediction accuracies were different across those three transitions of the first S3, using a logit mixed-effects model with TransitionType (first T42, second T42 [reference level], and T41) as a fixed effect as well as a by-subject random interecept. The test suggests that participants predicted the second T42 significantly worse than the first T42 (b = 1.836, SE = 0.370, z = 4.97, p [http://en.wikipedia.org/wiki/Tryptophan_synthase Tryptophan synthase] z = 5.66, p