Knowledge Vault 3/49 - G.TEC BCI & Neurotechnology Spring School 2024 - Day 4
Recording biosignals from different and multiple amplifiers
Micah Ching, g.tec medical engineering Canada (CA)
<Resume Image >

Concept Graph & Resume using Claude 3 Opus | Chat GPT4 | Llama 3:

graph LR classDef main fill:#f9f9f9, stroke:#333, stroke-width:1px, font-weight:bold, font-size:14px; classDef green fill:#d4f9d4, font-weight:bold, font-size:14px; classDef blue fill:#d4d4f9, font-weight:bold, font-size:14px; classDef orange fill:#f9d4a2, font-weight:bold, font-size:14px; classDef yellow fill:#f9f9d4, font-weight:bold, font-size:14px; A[Micah Ching] --> B[Multi-system acquisition
EEG, ECG, EMG 1] B --> C[Pilot-copilot brain sync,
driver-passenger responses 2] A --> D[g.tec: flexible wireless,
wired amplifiers 3] D --> E[Nautilus wireless: gel, dry
electrodes, acceleration sensors 4] D --> F[g.USBamp wired: up to
256 channels 5] A --> G[Combine biosignals, eye tracking,
VR, fNIRS, more 6] A --> H[MATLAB Simulink g.HIsys: multi-device
acquisition, 4 synced amps 7] A --> I[Demo: 16-ch wireless dry
EEG cap, live signals 8] I --> J[Add wireless 16-ch amp,
1-ch ECG with EEG 9] I --> K[g.Nautilus, g.Unicorn: EEG, ECG,
EMG flexion simultaneously 10] A --> L[Alternatives: stream data via
LSL, UDP 11] A --> M[Challenges: hardware limits, electrode
mounting, movement 12] M --> N[Gel electrodes: stable signals,
dry: faster setup 13] class A main; class B,C,I,J,K green; class D,E,F,L blue; class G,M,N orange; class H yellow;


1.- Mika from g.tec demonstrates multi-system data acquisition, combining signals like EEG, ECG, and EMG from one or more subjects.

2.- Examples include monitoring brain synchronization between pilot and co-pilot, or driver and passenger responses to sudden events.

3.- g.tec offers flexible wireless and wired amplifiers that can be configured for different numbers of channels and signal types.

4.- The Nautilus wireless amplifier supports gel or dry electrodes and has acceleration sensors. It pairs with a receiver connected to the computer.

5.- High-end wired amplifiers like the g.USBamp support up to 256 channels. Multiple amplifiers can be combined for even higher channel counts.

6.- Biosignal acquisition can be combined with eye tracking, VR, fNIRS and more for a complete lab setup.

7.- MATLAB Simulink with g.tec's g.HIsys toolboxes is used for multi-device data acquisition. It supports up to 4 synchronized amplifiers.

8.- Mika demonstrates a 16-channel wireless dry electrode EEG cap, configuring settings like bandpass filters and viewing the live signals.

9.- Next he adds a wireless 16-channel amplifier, using 1 channel with ECG electrodes to record ECG simultaneously with the EEG.

10.- The g.Nautilus and g.Unicorn wireless amplifiers are then used together to record EEG, ECG and forearm EMG flexion signals simultaneously.

11.- Alternatives to direct multi-device acquisition include streaming data between computers using lab streaming layer (LSL) or UDP network protocols.

12.- The main difficulties in multi-device setups relate to hardware limitations, electrode mounting, and keeping sensors in place during movement.

13.- Gel electrodes provide more stable signals during movement, while dry electrodes enable faster setup times. The best choice depends on the experiment.

Knowledge Vault built byDavid Vivancos 2024