When pointing down-left (135), the variability involved in
using the gamepad (61.9 for 1 SD) is about five to ten times larger
than the variability involved in using the other five devices. Rupp
et al. (2015) compared the usability of the gamepad, a traditional
joystick, and a keyboard in the control of unmanned vehicles and
found superior accuracy for the gamepad as compared to the other
two devices. The finding of Rupp et al. (2015) seems to be in
contradiction with our finding. However, the finding of Rupp et al.
(2015) could be related to accuracy requirements of the task and
the presence of visual feedback.
W