Extending the index finger is worse than sitting: Posture and minimal objects in 3D pointing interfaces

This study examined the relationship between objects of manipulation in interacting with an absolute 3D deictic gesture interface. Participants were given a hand-mounted 3D mouse and pointing movements were tracked by a Kinect sensor. Two experiments were run; the first in which the user either sat or stood while performing the points and the second the user's index finger was either splinted in a pointing position or left free. We found regulating the way the user pointed did not greatly change their behavior, while the seated posture impacted both the angle of the arm when pointing and the experienced fatigue.