Instructions

There are four color patches. Click on the one that appears to have a different colors than the other three. Scroll the slider to help you identify the one.

After each trial, the patches will briefly show random gray dots to reset your visual field, followed by the next trial. The patch with a different color is randomized across trials. Each trial is made to be more challenging if you keep identifying the correct patch, and vice versa. The experiment terminates when a threshold is found.