Glossary

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Idiosyncratic Gesture(also: Personalised Gesture, Idiosyncratic Movement)

A body-based communicative movement whose form and meaning are specific to one individual (and often to one communication partner), rather than drawn from a shared vocabulary like American Sign Language. Idiosyncratic gestures are central to unaided AAC for many people with…

Indirect Text Entry(also: Indirect Selection, Indirect Text Composition)

A text input method where the number of available input controls (such as switches or keys) is significantly smaller than the number of characters that can be entered. The user selects characters through an intermediary process such as scanning, where the system cycles through…

Input Rate(also: Keystroke Rate)

The speed at which a user can produce individual keystrokes or character inputs, typically measured in seconds per keystroke. Input rate varies dramatically across access methods: touch typists may achieve 0.1-0.2 seconds per keystroke, while users of switch scanning systems or…

Interaction Symmetry(also: Balanced Interaction)

The degree to which conversation partners have equal opportunities and means to participate in an interaction. In face-to-face spoken conversation, interaction is relatively symmetric—both partners can speak, listen, and use non-verbal cues at comparable speeds. AAC…

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