Behavioral effects of contextual expectation in the categorization task. Across participants' mean (±SEM) RTs across the three experiments: A, in the fMRI experiment; B, in the supplementary structure learning experiment; and C, in the supplementary incidental exposure experiment. Top row plots data as function of expectation (expected, orange; unexpected, purple) and bin (1-8) since the start of a context block. Bottom row plots the same data as a function of expectation and context half (first half, bins 1:4/second half, bins 5:8). After structure learning (A,B), participants responded faster in expected relative to unexpected trials in the second context half; such effect was not present during incidental exposure (C). *p < 0.05. **p < 0.01. ***p < 0.001.