The purpose of this applet is to time your reaction time. By clicking on the green "go" button you tell the timer to start. Wait for the beep, and click the red "stop" button as soon as you here the tone, or as soon as the red button gets brighter. Your time will then appear in the display area. The time of your reaction is given in milliseconds.
Click on the green "GO" button if you see it. If you dont the applet might not have started correctly. If you dont see a green "GO" button, you can probably guess where the button is supposed to be.
After clicking on the green button, the timer will flash "----:--" for a little while. Then you should here a beep. The beep means the timer has started and the red "STOP" button should be illuminated a brighter shade of red.
After pressing the red button your time will appear in the display window. You can start the test again by clicking on the green button.