Fusion supports consumer-grade mobile EEG headsets for recording brain activity during experiments. Data is captured in real-time, saved locally, and uploaded to Azure Blob Storage.
Supported Devices
| Device | Manufacturer | Connection | Status |
|---|
| Crown | Neurosity | Bluetooth + OAuth | ✅ Fully supported |
| Muse | Muse (Interaxon) | Bluetooth (muse-js) | ✅ Supported |
Connecting Your Device
Neurosity Crown — OAuth Authentication
- Navigate to the Devices section in the Fusion dashboard
- Click Connect Neurosity Crown
- You’ll be redirected to Neurosity’s OAuth page at neurosity.co
- Sign in with your Neurosity account and authorize Fusion
- After authorization, you’re redirected back to Fusion with an access token
- Select your device from the list of available Neurosity devices
Your device selection is saved and persists across sessions.
Muse — Bluetooth Pairing
- Ensure your Muse headset is powered on and in pairing mode
- Navigate to the Devices section in the Fusion dashboard or mobile app
- Click Connect Muse
- Select your Muse device from the Bluetooth list
- The connection is established via the muse-js library
Recording a Session (Neurosity Crown)
When you start a recording with a Neurosity Crown, Fusion captures 8 simultaneous data streams:
| Stream | Description | File Name |
|---|
| Raw Brainwaves | Voltage readings per channel per timestamp | rawBrainwaves_{timestamp}.csv |
| Power by Band | Alpha, beta, delta, gamma, theta power per channel | powerByBand_{timestamp}.csv |
| Signal Quality | Standard deviation and status per channel | signalQuality_{timestamp}.csv |
| PSD (Power Spectral Density) | Frequency-domain analysis per channel | psd_{timestamp}.csv |
| Accelerometer | Head movement (x, y, z) | accelerometer_{timestamp}.csv |
| Focus | Neurosity’s focus prediction score | focus_{timestamp}.csv |
| Calm | Neurosity’s calm prediction score | calm_{timestamp}.csv |
| Events | Experiment markers and annotations | events_{timestamp}.csv |
- Raw brainwaves: Each row contains a
timestamp, unixTimestamp, and one column per EEG channel (e.g., CP3, C3, F5, etc.)
- Power by band: Each row contains a
timestamp and columns like {channel}_alpha, {channel}_beta, {channel}_delta, {channel}_gamma, {channel}_theta
- Signal quality: Each row has a
timestamp, {channel}_value (standard deviation), and {channel}_status
- PSD: Each row has a
timestamp and one column per channel with semicolon-separated frequency values
Recording a Session (Muse)
When you start a recording with a Muse headset, Fusion captures 2 data streams:
| Stream | Description | File Name |
|---|
| Raw Brainwaves | Voltage readings across 4 EEG channels | rawBrainwaves_{timestamp}.csv |
| Events | Experiment markers and annotations | events_{timestamp}.csv |
Muse Specifications
| Spec | Value |
|---|
| Channels | TP9, AF7, AF8, TP10 |
| Sampling Rate | 256 Hz |
| Signal Quality Indicators | Great (green), OK (yellow), Bad (red), Disconnected (grey) |
- Raw brainwaves: Each row contains an
index, unixTimestamp, and one column per channel (TP9, AF7, AF8, TP10)
- Events: Each row contains a
startTimestamp, duration, and data (JSON-encoded experiment metadata)
Neurosity Crown vs. Muse — Data Comparison
| Data Stream | Neurosity Crown | Muse |
|---|
| Raw brainwaves | ✅ | ✅ |
| Power by band | ✅ | ❌ |
| Signal quality | ✅ | ❌ |
| PSD / FFT | ✅ | ❌ |
| Accelerometer | ✅ | ❌ |
| Focus predictions | ✅ | ❌ |
| Calm predictions | ✅ | ❌ |
| Events / markers | ✅ | ✅ |
Data Storage
Recordings are handled in two ways:
- Local download — a ZIP file containing all 8 CSV files is always downloaded to your computer
- Server upload — if the recording is part of a quest, each data stream is also uploaded to Azure Blob Storage as a separate dataset
Local downloads always happen, ensuring you never lose data even if the upload fails.
Billing
Each brain recording is billed as brain_recording to the quest’s organization. See the Pricing page for current costs.
Use Cases
| Scenario | Setup |
|---|
| Resting-state EEG | Record brain activity while participant views a fixation cross |
| Task-related EEG | Record during a jsPsych experiment and align with event markers |
| Meditation study | Record during a calm/focus session using Neurosity’s predictions |
| Longitudinal tracking | Repeated recordings over days/weeks via mobile app |
Tips
- Check signal quality before starting a recording — look for “good” status across all channels
- Use the events stream to mark experiment phases for later alignment
- Ensure a stable Bluetooth connection between the EEG device and the computer
- For mobile recordings, the Fusion app handles device connectivity through the same flow
- The Neurosity Crown streams additional data (focus, calm predictions) that the Muse does not provide
