Do not proceed unless you will have ten minutes of uninterrupted and undistracted use of the computer. You will also need a working printer, so be sure the printer is operational.

You will see pairs of patterns. Each pattern looks (vaguely) like a letter A, B, D, K or S. For each pair of letters, you must assign a rating of similarity on a scale from 1 to 9, where 1 means least similar and 9 means most similar.

Try to use the entire rating scale, from 1 to 9. Don't just give every pair about the same rating. There are no right or wrong ratings. Give each combination the rating that seems appropriate to you, while trying to use the entire rating scale from 1 to 9.

You will see four pages of ten pairs per page. After you have made your ratings, your data will be shown to you, and you will see further instructions.

Do not proceed unless you will have ten minutes of uninterrupted and undistracted use of the computer. If you are ready, click here: