Which circle looks the most different?

In a series of tasks, we are going to show you triplets of circles. Your job is to decide which circle looks the most different in each triplet.

Complete each task as accurately and quickly as possible.
To get you familiarized with the task interface, we will start with a short training session using squares. Click the button below to continue with the training session.

GREAT! You are done with training.
Now, take a moment and look at the circles above. How similar are they? What are the most similar and different pairs?
When you are ready, click the button below to start the study. Thanks for helping!

a b c

Which one looks the most different, a or b or c?

Your task is to select the square that looks the most different from the remaining two. You can make your selection by clicking on the square or by using the keyboard key. Complete each task as accurately and quickly as possible.

training session

a - select square a
b - select square b
c - select square c
enter or space bar - advance to next task

DONE! You have completed all the tasks. Now please tell us how you have compared the appearance of circles? Did you use any strategies? Enter these and any additional feedback in the box on the right.