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Alpha waves. A rhythm in EEG between about 8 and 12 Hz, often stronger when a person is relaxed with their eyes closed. App state. Small pieces of data, such as saves and settings, that an app stores for a user through Elata. Scoped to that app and that user. Artifact. In EEG, a signal that doesn’t come from the brain, such as a blink, jaw clench, or loose sensor. Artifacts are usually much larger than brain activity. Band power. How much of an EEG signal falls in a frequency band, such as alpha or beta. The basis of most “calm” and “focus” measures. Biometric Score. An optional, cross-app measure (0 to 100) built from derived session results, only with the user’s consent. See Privacy and consent. Biosignal. A measurable signal from the body, such as a heartbeat or the brain’s electrical activity. Consent. A user’s explicit, revocable permission for an app to contribute derived results to their Score. Requested by Elata, not by the app. Derived result. A summary computed from raw signals, such as average heart rate over a session. Raw signals are never part of it. EEG (electroencephalography). Measuring the brain’s electrical activity through sensors on the scalp. Elata. The marketplace at app.elata.bio where biosignal apps are published and played. Elata Points. Off-chain, non-transferable points earned for taking part on Elata. See Points. Elata SDK. Open-source packages for building biosignal apps. See The Elata SDK. ELTA. The ERC-20 token for the Elata ecosystem, on Base. See ELTA token. Federated learning. Training a model across many devices without collecting their raw data in one place. Planned research direction for Elata. Host bridge. The set of messages an app uses to ask Elata for things like purchases and saved progress. See Host bridge. HRV (heart-rate variability). The variation in time between heartbeats. Often linked to recovery and stress, and sensitive to recording conditions. Muse. A consumer EEG headband line (Muse 2, Muse S, and the newer Muse S Athena) supported by the Elata SDK. PPG (photoplethysmography). Measuring pulse by shining light into the skin and detecting changes in the reflected light, as smartwatches do. Release. One version of an app on Elata. Every release is scanned and reviewed before it goes public. rPPG (remote photoplethysmography). Estimating pulse from a camera by detecting tiny color changes in the skin. Sandbox. The isolated environment each app runs in, on its own web origin, so it can’t see who the user is or access their account. Web Bluetooth. A browser feature that lets web pages connect to Bluetooth devices. Available in Chrome and Edge, not in Safari or iOS browsers. WebAssembly (WASM). A format that lets fast, compiled code run in the browser. The Elata SDK’s signal processing runs as WebAssembly.