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To begin the experiment, click on "Start". If you wish to pause, click on the "Pause" button. The experiment will be paused. To resume, click on "Resume." Clicking on "Stop" will completely stop the experiment. Whatever data has been collected will be displayed.
After finishing the experiment, you can sketch out the pitch class circle that reflects your own response. Try doing the experiment a couple of times -- not all at once, but on other days. You will find that your response is pretty much the same each time you do it. You will also notice that your response is probably different than that of others.