Which symbol looks more similar to the reference?

In a series of tasks, we are going to show you a reference symbol and two other symbols. Your job is to decide which one of the two symbols looks more similar to the reference (see the task interface below).

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

GREAT! You are done with training.
Now, take a moment and look at the symbols 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!

reference

a b

Which is more similar to reference, a or b?

Your task is to select the symbol that looks more similar to the reference. You can make your selection by clicking on the symbol or by using the keyboard key. Complete each task as accurately and quickly as possible.

training session

a - select symbol a
b - select symbol b
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 the symbols? Did you use any strategies? Please enter your feedback in the following text box. Thanks for helping!