Heisenberg Effect

In human-computer interaction, a spatial interaction problem where the act of making a selection disrupts the positional accuracy of the cursor or pointer. In virtual reality freehand gesture contexts, the Heisenberg effect occurs when the physical movement required to confirm a selection (such as closing fingers for a pinch) inadvertently shifts the position of the hand, causing the user to miss their intended target. This is particularly problematic for users with motor impairments who may need to exert more effort to perform the confirming gesture, leading to larger positional shifts. Solutions include using the last known position before the selection gesture is activated, snap-to-target techniques, and gaze-assisted selection where eye tracking handles pointing while the hand gesture serves only as confirmation.