Brain Interfaces / Mobile EEG

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.

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Supported Devices

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Connecting Your Device

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Neurosity Crown — OAuth Authentication

1. Navigate to the Devices section in the Fusion dashboard
2. Click Connect Neurosity Crown
3. You’ll be redirected to Neurosity’s OAuth page at neurosity.co
4. Sign in with your Neurosity account and authorize Fusion
5. After authorization, you’re redirected back to Fusion with an access token
6. Select your device from the list of available Neurosity devices

Your device selection is saved and persists across sessions.

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Muse — Bluetooth Pairing

1. Ensure your Muse headset is powered on and in pairing mode
2. Navigate to the Devices section in the Fusion dashboard or mobile app
3. Click Connect Muse
4. Select your Muse device from the Bluetooth list
5. The connection is established via the muse-js library

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Recording a Session (Neurosity Crown)

When you start a recording with a Neurosity Crown, Fusion captures 8 simultaneous data streams:

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Data Format

• 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

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Recording a Session (Muse)

When you start a recording with a Muse headset, Fusion captures 2 data streams:

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Muse Specifications

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Data Format

• 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)

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Neurosity Crown vs. Muse — Data Comparison

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Data Storage

Recordings are handled in two ways:

1. Local download — a ZIP file containing all 8 CSV files is always downloaded to your computer
2. Server upload — if the recording is part of a quest, each data stream is also uploaded to Azure Blob Storage as a separate dataset

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Billing

Each brain recording is billed as brain_recording to the quest’s organization. See the Pricing page for current costs.

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Use Cases

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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