Developmental grey matter changes in superior parietal cortex accompany improved transitive reasoning.

Third, because the behavioral analysis showed a trend-level main effect of task difficulty on accuracy scores, with higher accuracy for the non-inverted (easy) items, and also because this is a well-known effect reported in the literature (Waechter et al., 2013 ; Waltz et al., 1999 ), a second SPM model was created, taking into account task difficulty on reasoning accuracy.

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