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(A) Classification Image for each participants, estimated with optimal smoothness hyperparameters λ1 and λ2 (n = 10000 trials for each estimate). Weights are divided by their maximum absolute values. Boxes corresponds to the position of the second formantic transition (F2) in the original stimuli spectrograms. (B) Same as above except that non-significant weights are shown in gray scale (p < 0.005, permutation test).
