Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Pulse Oximetry(also: Pulse Oximeter, SpO2 Monitoring)
- A non-invasive method of monitoring blood oxygen saturation (O2sat) and heart rate using a sensor typically placed on the finger or wrist. Pulse oximeters use light absorption through the skin to estimate the percentage of hemoglobin in the blood that is carrying oxygen. In…
- Pupillometry(also: Pupil Dilation Measurement)
- A psychophysiological measurement technique that tracks changes in pupil diameter as an objective indicator of cognitive workload, mental effort, and emotional arousal. In accessibility research, pupillometry provides a non-invasive way to assess how demanding an interface or…
- Push-to-Talk(also: PTT, Push to talk)
- An interaction pattern where a user presses and holds (or taps) a dedicated button to signal the start of an input — historically used in two-way radios, now common in voice assistants and conversational interfaces as an alternative to continuous listening. In accessibility…