In this study, you will be tasked with quickly recognizing scenes.

On each trial, you'll be presented with a picture of a scene, such as the one on the bottom left, for a brief moment. Then the first picture will disappear and you will be presented with another picture of a scene, such as the one on the bottom right. Sometimes the second picture will depict the same thing as the first picture, and sometimes it will depict something different.

Your job is to decide whether the two scenes match (which requires a "yes" response) or do not match (which requires a "no" response).

Click Next to continue.

For example, imagine again that you were presented with the picture on the bottom left. Then imagine that next you were presented with the picture on the bottom right.

Because the two scenes match, you should respond "yes". In the experiment, you'll press the Y key for "yes".

Click Next to continue.

Now imagine that you were presented with the same first picture as before, as on the bottom left. Then imagine that next you were presented with the picture on the bottom right.

Because the two scenes do not match, you should respond "no". In the experiment, you'll press the N key for "no".

Click Next to continue.

The pictures to compare will be different from trial to trial.

For example, you might first be presented with the picture on the bottom left. Then you might be presented with the picture on the bottom right. Because the two scenes do not match, you should respond "no".

Click Next to continue.

There is no trick here: If you are paying attention, the answer on each trial will be obvious.

However: You will not have much time! The first picture will disappear after just a brief moment. And once you see the second picture, you must respond quickly; otherwise, the trial will end after a short time and you will be gently warned for being too slow.

So it is important that you pay close attention once you begin the trial, and that you respond both accurately and quickly!

Click Next to continue.

The whole study will take about 12 minutes; please stay focused!

(Note: When the experiment is done, you will be redirected back to SYSTEM's webpage where you will be given a completion code.)

First, to make sure everything is clear, we'll try some really easy trials for practice.

In these trials, the first picture will only be shown for a brief moment. However, you will have unlimited time to respond, so take your time. It is important during the practice that you understand how the trials work.

Note that you will see the same set of objects throughout the practice (a book and a bookshelf); however, in the real experiment, the objects will be different, and will change from trial to trial.

Also note that in the real experiment, you will only have a limited time to respond!

Click "Start Practice" to begin.

You have finished the practice trials. The real experiment will now begin.

Note that on these trials, you will only have a brief time to respond once the second picture appears, so you'll have to be quick! Just do the best you can.

Also note that the objects here will be different from the ones you saw in the practice.

There will be periodic breaks interspersed throughout the study.

Click "Start Experiment" to begin.

Great job so far. Keep the focus up!

Remember: Do your best to be as fast and accurate as possible.

Take a quick break. When you're ready to continue, click "Continue Experiment" below.