Prior probability biases perceptual choices by modulating the accumulation rate, rather than the baseline, of decision evidence.

We found a highly significant effect of component on both A z (χ 2 = 9.83, p < 0.01; Fig. 2b ) and onset time (χ 2 = 159.05, p < 0.01; Fig. 2c ), with the Late component reaching higher discrimination power and occurring systematically later in time compared to the Early one.

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