Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Object Hierarchy(also: Object Group, Hierarchical Object Organization)
- A structured organization of objects into parent-child relationships that allows users to navigate from high-level categories to increasingly specific details. In accessible virtual environments, object hierarchies enable BLV users to progressively explore complex scenes by…
- Olfactory Display(also: Olfactory Interface, Olfactory Feedback, Smell Display)
- An olfactory display is a hardware system that delivers controlled scent stimuli to a user, typically as part of a virtual reality, augmented reality, or multisensory interaction system. Designs range from desk-mounted vapour generators to head-mounted, hand-held, and neck-worn…
- Optic Flow(also: Visual Flow, Optical Flow)
- The pattern of apparent motion of objects, surfaces, and edges in a visual scene caused by relative movement between the observer and the scene. Optic flow provides critical information about self-motion, speed, direction, and the structure of the environment. It plays a key…
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