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Glossary

Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.

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Biofeedback
A therapeutic technique in which individuals are presented with real-time measurements of their physiological variables — such as heart rate, blood oxygen saturation, muscle tension, or brain waves — to help them learn to regulate these functions. In accessibility contexts,…
Blood Oxygen Saturation(also: O2sat, SpO2, Oxygen Saturation)
The percentage of hemoglobin in the blood that is bound to oxygen, typically measured non-invasively using a pulse oximeter. Normal blood oxygen saturation is generally 95-100%, and levels below 88-90% are considered clinically concerning and may indicate hypoxemia (dangerously…
Brain Fog(also: Cognitive Fog, Mental Fog)
Brain fog is a term used to describe a cluster of cognitive symptoms including difficulty concentrating, memory problems, mental fatigue, and reduced clarity of thought. It is commonly associated with chronic conditions such as fibromyalgia, multiple sclerosis, long COVID,…

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