Glossary

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Camera Mouse(also: Head-Controlled Mouse Pointer, Head Tracking Mouse)

A computer-vision-based mouse-replacement system that tracks a user's head motion through a standard webcam to control the mouse pointer on screen. Developed at Boston University by Margrit Betke and James Gips, Camera Mouse is freely available and enables people with severe…

Chairable Technology(also: Chairable Input, Chairable Devices)

Input devices and interactive technologies designed to integrate with the form of a wheelchair, analogous to how wearable technology fits with an individual's clothing. Chairable technology recognises that power wheelchair users spend most of their waking hours in their chairs…

Chord Entry(also: Chording, Chord Input, Chordal Input)

A method of text input where multiple keys are pressed simultaneously to produce a single character, rather than pressing keys sequentially. In braille keyboards such as the Perkins Brailler, chord entry involves pressing combinations of six keys at once to represent different…

Click-Time Distribution(also: Timing Profile, Click Precision)

A statistical model of when a switch user activates their switch relative to a target timing event, used to characterize the precision and consistency of a user's motor control. In the Nomon interface, the click-time distribution measures how accurately a user clicks when a…

Click-on-Lift(also: Lift-off Activation, Release Activation)

An interaction technique where a touch target is activated only when the user lifts their finger from the screen while still within the target area, rather than registering the action at the point of initial contact. This approach is particularly beneficial for users with hand…

Clutching(also: Clutch Mechanism, Clutch Gesture)

In gesture- and motion-based input systems, a mechanism that lets the user temporarily disengage the recogniser so that everyday, non-communicative movements — reaching, adjusting posture, gesturing socially — do not trigger false activations. Named after the mechanical clutch…

Command Recognition(also: Command Classification, Input Recognition)

The process by which a computer system interprets and classifies a user's input action — such as a gesture, voice command, or key press — as a specific intended command from a predefined vocabulary of possible commands. The accuracy of command recognition is characterised by the…

Connected Speech Recognition(also: Continuous Speech Recognition)

A form of automatic speech recognition in which users speak words naturally, with normal coarticulation and minimal pauses, rather than pausing between each word as required by older 'discrete' or 'isolated-word' recognisers. Connected-speech recognition was a significant…

Continuous Voice Control(also: Continuous Vocal Control, Proportional Voice Control)

A voice interaction paradigm in which vocal parameters such as pitch, loudness, vowel quality, and timbre are used to provide smooth, proportional, real-time control of a system, as opposed to discrete voice commands that trigger specific actions. Continuous voice control is…

Curse of Dimensionality (Accessibility)

In an accessibility context, the practical barrier that arises when a player or user must coordinate a large number of distinct inputs simultaneously or in rapid succession — for example, moving, aiming, shooting, and reloading concurrently in a first-person shooter. Even when…

Cursor Control(also: Pointer Control, Cursor Navigation)

The ability to direct and position an on-screen cursor or pointer using an input device such as a mouse, trackball, touchpad, joystick, or eye tracker. Cursor control is a fundamental requirement for interacting with graphical user interfaces and involves both gross movements…

Cursor Deviation(also: Cursor Drift, Path Deviation)

The difference between the actual path taken by a cursor and the ideal straight-line path between the starting point and the target. Cursor deviation is a key performance metric in evaluating alternative input devices such as head controls, eye trackers, and adapted mice. Higher…

Cursor Movement(also: Cursor Navigation, Pointer Movement, Mouse Movement)

The process of controlling the position of a pointer or cursor on screen using an input device such as a mouse, trackpad, or joystick. Cursor movement efficiency is a key metric in accessibility research, measured through movement time, velocity, and path directness. Users with…

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