highly significantP = 8.97 × 10 31
The correlation between the trial-by-trial change of phasic pupil dilation and that of absolute movement error for the group-averaged data was highly significant ( r = 0.64; P = 8.97 × 10 31 ; bootstrap 95% confidence interval: [0.43, 0.80]), suggesting that the phasic pupil dilation may reflect error size.