Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Photoplethysmography(also: PPG)
- A non-invasive optical technique used to detect blood volume changes in peripheral circulation, commonly implemented in wearable devices like smartwatches and fitness trackers. PPG sensors use light (typically red and green LEDs) to measure how blood flow absorbs and reflects…
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