Implicit Interaction

Implicit interaction refers to user input that the system infers from natural behaviors not explicitly performed for the purpose of issuing commands, such as gaze, gait, posture, physiological signals, or ambient context. It contrasts with explicit interaction, where users intentionally press buttons, type, speak commands, or perform recognized gestures. For accessibility, implicit interaction can lower input cost for users who cannot easily produce explicit input, for example by using sustained gaze, head pose, or breath patterns to drive an interface. The same property creates real risks: implicit input can be captured without informed consent, can misclassify users whose behavior differs from the training distribution (including disabled users), and blurs the line between observation and command. Designs should make inferred state visible, contestable, and easy to override.