Dwell-Based Selection

An interaction technique used in eye-gaze and head-tracking interfaces in which holding the cursor over a target for a fixed duration (the 'dwell time', typically 300-1000 ms) triggers a selection, replacing the click action that a mouse user would perform. Dwell-based selection enables fully hands-free input but introduces well-known trade-offs: short dwell times cause accidental selections (the 'Midas touch' problem), while long dwell times slow interaction and increase eye fatigue. Designs typically mitigate these trade-offs with large targets, magnetic snapping, visual progress indicators, an explicit dwell-disable mode, or alternative confirmation methods such as a switch or BCI-decoded click. Dwell-based selection is foundational to many assistive technologies for users with severe motor impairment, including ALS, cerebral palsy, and high-level spinal cord injury.