Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Perceived Urgency(also: Alert urgency, Urgency perception)
- The subjective sense of immediacy or threat conveyed by an alert, shaped by parameters such as pulse rate, inter-pulse interval, pitch, loudness, and — for tactile signals — vibration intensity and pattern duration. Research on aircraft alarms, hospital alarms, and driver…
- Perceptual Cycle(also: Perceptual Response Time, Perceptual Processing)
- In the Model Human Processor framework, the perceptual cycle is the time required for a person to perceive and register a stimulus from their environment, such as seeing a visual change on screen. The perceptual cycle time for both able-bodied and motor-impaired users is…
- Prior Knowledge(also: Background Knowledge, Existing Knowledge)
- Information and experience a user brings to a technology interaction before it begins, including technical knowledge of how devices work, functional knowledge of task goals, strategic knowledge of problem-solving approaches, and self-knowledge of personal abilities and…
- Psychophysics
- Psychophysics is the scientific study of the quantitative relationship between physical stimuli and the sensations and perceptions they produce. Founded in the 19th century, it uses rigorous experimental methods to measure how humans detect, discriminate, and scale sensory…
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