Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Perceptual Congruence(also: Perceptually Congruent Structure)
- A design principle for accessible representations that requires the structure of a non-visual interface (such as a screen reader navigation tree) to mirror the visual structure of the original graphical representation. A perceptually congruent screen reader structure preserves…
- Personal Data Externalization(also: Data Externalization)
- The process of representing internal experiences — thoughts, emotions, behaviours, bodily states — in some external medium such as a drawing, written word list, spreadsheet, physical artefact, or tracking log. Drawing on Larkin and Simon's distinction between internal and…
- Pitch Mapping(also: Pitch-Y Mapping, Frequency Mapping)
- A sonification technique that maps data values to auditory pitch, where higher values produce higher-pitched sounds and lower values produce lower-pitched sounds. In accessibility contexts, pitch mapping is commonly used to represent the vertical position (Y-axis) of data points…
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