Fig. 6.

Drift diffusion modeling. A: data were grouped by stimulus coherence. Right, proportion of correct responses. Left, reaction times for each of the transformed stimuli. Top, measures before tDCS and learning. Bottom, the same measures after tDCS and learning. B: a drift diffusion model was fit to the data shown in A. The first three boxes on the top and bottom show the parameters that account for the outcome of perceptual decisions. The fourth box shows the parameter that accounts for processes unrelated to perceptual decision making. Top, parameters before tDCS. Bottom, parameters after tDCS. Cerebellar tDCS caused a difference in the parameter that accounts for processes unrelated to perceptual decision making. *Parameters statistically different at P < 0.05.