Related Experiment Video
Updated: May 26, 2026
13:32
Recording Human Electrocorticographic (ECoG) Signals for Neuroscientific Research and Real-time Functional Cortical Mapping
Published on: June 26, 2012
Wireless instrumentation system based on dry electrodes for acquiring EEG signals
Nuno Sérgio Dias1, João Paulo Carmo, Paulo Mateus Mendes
1Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal.
Medical Engineering & Physics
|December 14, 2011
Summary
This study introduces a novel wireless electroencephalogram (EEG) system using dry electrodes for non-invasive brain signal acquisition. The system offers high-resolution, mobile EEG monitoring without conductive gels, enhancing patient comfort and data quality.
Area of Science:
- Biomedical Engineering
- Neuroscience Instrumentation
- Wearable Technology
Background:
- Conventional electroencephalogram (EEG) systems often require conductive gels and wired connections, limiting subject mobility and comfort.
- Non-invasive brain-computer interfaces and monitoring demand robust, portable, and user-friendly acquisition systems.
Purpose of the Study:
- To present a complete non-invasive wireless acquisition system based on dry electrodes for electroencephalograms (WiDE-EEG).
- To detail the electronic system design, dry electrode fabrication, and performance characteristics of the WiDE-EEG system.
Main Methods:
- Development of a 2.4 GHz radio-frequency (RF) transceiver and biopotential acquisition electronics.
- Fabrication of dry electrodes using bulk micromachining with iridium oxide coating for biocompatibility.
- Integration of 5 unipolar channels with 16-bit resolution and 1000 samples/s/channel sampling rate.
Main Results:
- The WiDE-EEG system achieves a minimum analog amplitude resolution of 9.98 μV(pp) and a signal gain of 66 dB.
- Dry electrodes with microtip structures ensure good skin contact, eliminating the need for conductive gels.
- The compact, battery-powered system (107 mW) offers 25-hour autonomy and a 10m RF range, enabling true subject mobility.
Conclusions:
- The developed WiDE-EEG system provides a complete, non-invasive solution for mobile EEG acquisition.
- The novel dry electrode design and optimized electronics overcome limitations of traditional EEG systems.
- This technology facilitates enhanced patient safety and data acquisition rates for various neuroscience applications.
