A "Begin" button will appear on the left when the applet is finished loading. This may take a minute or two depending on the speed of your internet connection and computer. Please be patient.

Starting the Applet
Press the "Begin" button to start the applet in another window. The window opens and displays a button labeled "Click to begin." Clicking this button begins the trials.

This applet times how long it takes you (in milliseconds) to move the mouse to a button and click it. On half of the trials you click a small button; on the other trials you click a large button. After a total of 40 trials, your data will be analyzed and displayed. The author's mean times were 769 msec for the small button and 577 msec for the large button.