Glossary
Searchable terminology from accessibility, web standards, and related fields.
4 results found in physiological sensing.
- Autonomic Nervous System (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:…
- Functional Near-Infrared Imaging (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 b…
- Heart Rate Variability (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 s…
- Photoplethysmography (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 (…