Glossary

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Debounce(also: Debounce Filter, Key Debounce, Bounce Key Filter)

A keyboard accessibility feature that filters out unintended extra keypresses caused by tremor or imprecise motor control. When enabled, the system ignores rapid successive activations of the same key within a specified time window, treating them as a single press. Debounce is…

Direction-Based Navigation(also: Directional Navigation, Direction-Based Cursor Control)

A cursor control method where users issue directional commands such as "move left," "move up," or "move down" to reposition the cursor on screen. In speech-based implementations, these commands move the cursor continuously or in fixed increments. Direction-based navigation is…

Disambiguation(also: Target Disambiguation, Touch Disambiguation)

In accessible interface design, disambiguation is the process of resolving ambiguity when a user's input could correspond to more than one interactive target. This commonly occurs on touchscreens where small, densely packed elements make precise selection difficult, particularly…

Discrete Specification(also: Discrete Positioning, Grid-Based Positioning)

In cursor control interfaces, a positioning method where the user selects from a finite set of predefined locations to move the cursor to an approximate position quickly. Examples include grid-based systems where the screen is divided into numbered cells, or ghost cursor systems…

Dwell Selection(also: Dwell Click, Dwell Time Selection, Hover Click)

An interaction technique where a user activates or selects an on-screen element by keeping a cursor, gaze point, or pointer within the target area for a specified duration (the dwell time), rather than clicking or tapping. Dwell selection is essential for people with motor…

Dyskinesia(also: Levodopa-Induced Dyskinesia, LID)

A movement disorder characterized by involuntary, uncontrollable movements such as twitching, swaying, or jerking, most commonly associated with long-term use of levodopa medication for Parkinson's disease. Dyskinesia can significantly affect a person's ability to use standard…

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