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surprisal effect was significantly reduced and not significant in the Hamiltonian walk, with an estimated increase in RT of 7.16 ms (Supplementary Table 3; linear mixed effects model; t ( 58 ) = 0 . 69 , p = 0 . 49, 95% confidence interval: -13.17 to 27.49). However, a subject’s coefficient for cross-cluster surprisal in the random walk was significantly correlated with that in the 

