Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Autonomic Nervous System(also: ANS)
- The division of the nervous system that regulates involuntary physiological processes including heart rate, blood pressure, respiration, digestion, and stress responses. The ANS has two main branches: the sympathetic nervous system (activating "fight or flight" responses) and…
- Functional Near-Infrared Imaging(also: fNIR, fNIRS, Functional Near-Infrared Spectroscopy)
- A neuroimaging technique that measures brain activity by detecting changes in oxygenated blood volume using near-infrared light transmitted through the skull. In accessibility contexts, fNIR enables brain-computer interfaces that allow people with severe motor disabilities to…
- Heart Rate Variability(also: HRV)
- The variation in time intervals between consecutive heartbeats, reflecting the balance between sympathetic (stress response) and parasympathetic (rest and recovery) branches of the autonomic nervous system. HRV is used as an objective measure of stress, emotional state, and…
- 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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