Image 5: A pop-up of the 21 different Windows Control shortcuts that appears on the left side of the screen.
“Same as Primary Selection [Left Click] but with a higher pre- cision. Secondary Selection means that the zoom will progress deeper before the final execution of the Task, making the de- sired portion of the screen bigger and easier to select within.” Tertiary Click is another task that is not visible on the taskbar. The eye gaze user must dwell on the “Left Click” a little bit longer than when trying to activate “Secondary Click.” Ultimately, the tertiary click activates “Sticky Left Click.” Imagine you are holding down the Left Click on your mouse or trackpad. It is the same emulation using eye gaze. It is less work for the eye gaze user to activate “Sticky Left Click” than to activate “Left Click” to perform the action, then activate “Left Click.” The shortcut task opens up a pop-up on the left side of the eye gaze user’s PC or Surface Pro. See Image 5 for a picture of the pop-up that appears on the left side of the screen. This allows the eye gaze user to execute certain tasks more quickly without having to do more work on their eyes. If you begin to teach an eye gaze user with Windows Control first, I suggest going into “Settings” and limiting the number of tasks on the taskbar to “Left Click” only and “Settings” because it isolates the targets for them. The reason for starting with “Left Click” is because it is the most commonly used mouse emula-
tion for accessing games or fun activities. For a beginning eye gaze user, holding a gaze at a small target can be very difficult and fatiguing. By limiting the number of tasks on the taskbar, it limits the eye gaze user from making so many errors. As the implementer, you want your eye gaze user to experience that immediate gratification of success, especially if you are trying to build their intrinsic motivation. In order for the eye gaze user to experience imminent success, use a backwards chaining ap- proach. At first it might be very difficult for the eye gaze user to select the “Left Click” from the taskbar, then shift their gaze to the desired target. As the implementer, I may activate “Left Click” with my finger for the eye gaze user, let the eye gaze user track and then dwell to activate the target. It is important to remember that the tasks on Windows Con- trol are very small icons. In order to activate the secondary and tertiary clicks, it takes a great deal of practice to hold a gaze and dwell over a small target as a beginning eye gaze user. When the shortcut window opens, it requires tracking to the pop-up win- dow and dwelling on a target. When the targets are very close together, this can increase the probability of error.
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