TABLE I.
Parameters of the virtual environment and specific values used for all subjects.
| Parameter | Value used | Description |
|---|---|---|
| Field | ||
| Width | 1600 px | Virtual environment width (horizontal dimension) |
| Height | 900 px | Virtual environment height (vertical dimension) |
| Slingshot position | ||
| X | 150 px | X and Y coordinates (from the left and bottom of the screen, respectively) of the center of the sling. |
| Y | 75 px | |
| Targeta | ||
| X | 1150 px | X and Y coordinates of the center of the target circle. Ø represents the diameter of the target circle. |
| Y | 600 px | |
| Ø | 60 px | |
| Obstacleb | ||
| X | 1000 px | X coordinate represents the location of an obstacle (i.e., a wall) from the left of the screen. Yt represents the height (i.e. the “top”) of the obstacle minus Yb (i.e., the “bottom”). |
| Yt | 20 px | |
| Yb | 20 px | |
| Gravity | ||
| −0.0175 px/s2 | Force of gravity on the ball |
a
During exploratory testing, the target was placed at X = 500 px and Y = 700 px.
b
The virtual environment can contain a wall, but this was not used for the current study.