Glossary

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Silent Speech(also: Silent Speech Interface, SSI)

Communication technologies that generate intelligible speech from non-acoustic signals produced during the intent or attempt to speak, without requiring audible voicing. Input modalities include surface electromyography of articulatory muscles, ultrasound tongue imaging,…

Sony Access Controller(also: PlayStation Access Controller, Project Leonardo)

A customisable game controller released by Sony in 2023 for the PlayStation 5, designed for players with limited motor control. The Access Controller is a circular unit with swappable button caps, long-throw levers, adjustable stick positioning, and four 3.5mm ports for external…

Speech-Based Cursor Control(also: Voice Cursor Control, Speech-Driven Pointing)

A method of controlling a computer's pointing cursor using spoken voice commands rather than a mouse, trackpad, or other physical pointing device. Users speak directional commands (such as "move left," "move up") to start cursor movement and a stop command to halt it, then issue…

Speech-Based Cursor Movement(also: Voice-Controlled Cursor, Voice Cursor Control)

A technique for moving the on-screen cursor using voice commands rather than physical manipulation of a pointing device. Speech-based cursor movement systems typically use one of two approaches: discrete specification, where the user speaks a command to jump the cursor to a…

Subvocal Input(also: Subvocal Control, Subvocalisation Input)

An input method that uses very quiet or nearly silent vocalisations — sounds produced with minimal vocal effort that are typically inaudible to nearby people. Subvocal input includes techniques such as humming, whispering, or producing sounds detectable only by bone-conduction…

Surface Electromyography(also: sEMG, Surface EMG)

A non-invasive technique for measuring the electrical activity produced by skeletal muscles, using electrodes placed on the skin over the muscle. Surface EMG is used in biomechanics, prosthetic control, rehabilitation, and — increasingly — as an input modality for accessible…

Switch Scanning(also: Switch Access, Scanning Input)

An alternative input method in which items on a screen are sequentially highlighted and the user activates a switch to select the desired item when it is highlighted. Switch scanning is used by people with significant motor impairments who cannot use direct touch, a mouse, or a…

Syntax-Directed Editor(also: Structure Editor, Syntax-Aware Editor)

A code editor that understands the formal grammar of a programming language and uses this knowledge to guide editing operations. Unlike plain text editors, syntax-directed editors treat source code as a structured tree of language constructs rather than a sequence of characters.…

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