一项任务是用电脑鼠标追踪一个移动的点，另一项任务是对屏幕上的字母做出反应。
One involved tracking a moving dot with the computer mouse, and the other involved responding to letters presented on the computer screen.
当在Opera 10.6 x上看的时候，你可以看到性能相当差，没有滤镜效果的那个小圆圈甚至不能追踪到鼠标点。
When viewed in Opera 10.6x, you can see the performance is quite slow, and the filter-less circle has trouble catching up with the pointer.
追踪点可以选择通过点击跟踪器的列表，或者在图像窗口的鼠标悬停时一个追踪者。
Trackers can be selected by either clicking in the tracker list, or in the image window whilst hovering the mouse over a tracker.
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