Glossary

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Occlusion(also: Hand Occlusion, Finger Occlusion, Visual Occlusion)

In the context of touchscreen and pen-based interaction, occlusion refers to the user's hand or finger blocking their view of content on the screen while interacting with it. Occlusion is a significant accessibility barrier, particularly for older adults and users with motor…

On-body Input(also: Skin-based Input, Body-based Interaction)

An interaction technique that uses the surface of the user's own body — typically the hand, arm, or other skin areas — as an input surface for controlling digital devices. On-body input is sensed through wearable cameras, depth sensors, capacitive touch sensors, or acoustic…

Overlap Error(also: Key Overlap Error, Simultaneous Key Press Error)

A typing error that occurs when two keys are pressed down at the same time, typically when a finger accidentally activates an adjacent key while moving toward the intended key, or when a user's hand rests on a key unintentionally. Overlap errors are particularly common among…

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