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Emily Yu


Williams College Class of 2011
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From the trajectories on the previous page, I made some observations on the subject's movement ability.

  • In general, diagonal movements seemed to be much more natural than strictly horizontal or vertical movement.

  • Longer movements also seemed much smoother than shorter ones. Take for example, the trajectories from buttons 2 to 3 compared to the ones from buttons 5 to 6:

    • [buttons 2 to 3]

    [buttons 5 to 6]

    The movement from buttons 2 to 3 and 5 to 6 are the same direction- up and to the right diagonally. The only difference is that the length from 5 to 6 is longer than the length from 2 to 3.

  • More precision movement near the endpoints (where the buttons are) seems to be difficult. For example:

    • [buttons 4 to 5]
    From buttons 4 to 5, the majority of the movement is done smoothly as can be seen from the long line in pink and yellow. Since there are no coordinate points on this line, this movement must have been made within one frame of the video input from the webcam.

    There is, however, a large build up of points at the ends as the subject tries to center in on the button and hold it there long enough (> .1 seconds) to click on it.

  • The diagonal movement "/" (up and right or down and left) seems to be the most natural:

    • [buttons 4 to 5]

    [buttons 5 to 6]

    [buttons 13 to 14]
    Above are the three most accurate trajectories. As can be seen, all are either diagonally upward and to the right or downward and to the left.

  • Also, this diagonal motion can be seen in many of the other trajectories:

    • [buttons 7 to 8]

    From button 7 to 8, the actual path is supposed to be straight down vertically. In his attempt, the subject makes a very smooth motion down and to the left before struggling to bring the mouse back to the right to hit button 8.

    [buttons 8 to 9]

    From button 8 to 9, the actual path is straight left horizonatally. The subject, again, makes a very smooth diagonal move that's down and left before having trouble bringing it back up.

    [buttons 9 to 10]

    From button 9 to 10, the path is straight right horizontally. The subject takes three short diagonal moves upward and to the right, coming back down after each one.

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