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

You will see a series of rectangles with a small interior vertical line. From trial to trial, the rectangle will have different heights and the interior line will be in different positions. Your job is to learn which combinations of rectangles and lines belong to Category X and which belong to Category O.

As each rectangle with line is shown, you will be asked to categorize it as an X or an O, and after submitting your answer, you will be shown the correct categorization. At first you will just be guessing, but after a few trials you will learn which is which.

Please study the items carefully, because you will have only 16 trials in which to learn the categorization.

After learning for 16 trials, you will be shown some novel rectangles with lines, and asked to give your rating of whether they probably belong to category X or category O.

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