Glossary Terms

A low-persistence display illuminates each pixel only briefly rather than continuously, which reduces motion blur during head movement and noticeably lowers user discomfort. Source: Unity Glossary Read more

Machine learning (ML) is a set of techniques for training AI systems to improve at a task by analyzing data, rather than by being explicitly programmed with rules for that task. Because the system’s performance is learned from data, its behavior reflects the data it was trained on. Sources: FDA Digital Health and AI Glossary;… Read more

Algorithmic bias is a systematic deviation in a model’s predictions or outcomes for certain people or groups compared with others. The concern is unwanted bias that places some groups at systematic advantage and others at systematic disadvantage, which is a central risk when AI is applied across diverse patient populations. Sources: FDA Digital Health and… Read more

A machine learning model is a mathematical construct that produces an inference or prediction from input data. It is the result of a machine learning algorithm having learned from data, and it is the model, rather than the algorithm, that is deployed in practice. Source: FDA Digital Health and AI Glossary Read more

A machine learning-enabled medical device (MLMD) is a medical device that uses machine learning, in whole or in part, to achieve its intended medical purpose. Source: IMDRF N67 (2022) Read more

For AI and machine learning purposes, a medical device is any instrument, apparatus, software, material, or related article intended by its manufacturer to be used for a specific medical purpose in human beings, such as diagnosis, prevention, monitoring, treatment, or alleviation of disease. The full definition in the source document is longer than this summary… Read more

Medical extended reality (MXR) is the field at the intersection of health care and immersive technology, covering virtual, augmented, and mixed reality applications across a wide range of medical disciplines. It is used as an umbrella term for clinical uses of immersive technology rather than as a label for any single technique. Source: Spiegel et… Read more

Metizens is a term for the userbase, or inhabitants, of the metaverse. Source: ACM Metaverse Glossary Read more

Mixed reality (MR) blends digital content with the physical environment so that both coexist and interact in real time, with virtual objects anchored to real surfaces rather than simply layered over the view. It sits between augmented and virtual reality on the immersion spectrum. Sources: Unity Glossary; XRSI Standard XR Definitions (XR-001); ETSI eXtended Reality Read more

Mixed reality capture, sometimes called mixed cast, combines real-world video of a person using VR with simultaneous footage from inside the virtual environment. It produces demonstrations that convey the experience to people who are not wearing a headset. Source: Unity Glossary Read more