Press the space bar to start the trial.

Pay attention to the sad faces and remember which ones they are once they become happy faces. When one of the faces changes into a question mark, respond with one of the following keys:

B key - indicates you think this face started as a blue face
Y key - indicates you think this face was always a yellow face

If you need to review the instructions, you can click on the icon in the bottom right corner or return to the tutorial.

You will not receive feedback on whether your answer is correct on the main task.

The experiment is divided in 3 blocks of 20 trials with a small break between each block

The experience works better in fullscreen. When you click on the continue button, your browser will automatically go in fullscreen mode.

You can quit fullscreen at any time by using the escape key or by clicking on the close button that will appear when you move your mouse cursor at the top of the screen.

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This is the end of the task.

Press escape to exit full screen.