Parameters of logistic function for different masking conditions.

<p>a, violin plots with width indicating density of values, inner lines indicating median and 25% and 75% quartiles; b, red bars indicate 95% confidence intervals of the mean for each condition; line graphs in the background depict the raw data of each participant; black lines indicate that the participant's value for the left-hand condition is numerically bigger than the right-hand value; blue line indicates that the value is smaller for the left-hand compared to right-hand condition; 'whole face', whole face is visible (no masking); 'upper half', upper face half is visible (lower half is masked); 'lower half', lower face half is visible (upper half is masked).