This is a parts list for making simple passive earpieces for sensing EEG, EOG, and EMG (hence ear-EXG) from the ears.
This shows data captured by eartips worn in the left and right ears, referenced to A1 (left ear lobe). Data was recorded by connecting the earpieces to a CGX Quick-32r headset, and band-pass filtered to 0.5-100 Hz by the CGX acquisition software (default settings).
These are the parts I used to make the eartips. Substitutions should be possible.
| Description | Name | Link |
|---|---|---|
| Conductive fabric | Nano 3D Systems CF-Ag-010-SSW2-1 | https://nano3dsystems.com/product/silver-conductive-fabric-super-stretchable-washable/ |
| Conductive thread | LIBERATOR 40 | https://www.amazon.com/LIBERATOR-Highly-Conductive-Thread-Textiles/dp/B08X8MT2FH |
| Eartips (medium-large canals) | Shure EAYLF1-10 | https://www.amazon.com/dp/B001O3TZ3K |
| Eartips (small canals) | Shure Comply 100 XS | https://www.amazon.com/Shure-Comply-Foam-Sleeves-100/dp/B0CCW9HTFW/ |
| Touchproof connectors (DIN)* | Molex P/N 02-06-1103 | [https://www.mouser.com/ProductDetail/Molex/02-06-1103 ] |
*only needed if acquisition system uses touchproof connectors
(coming soon!)
Please feel free to make a pull request with your own material substitutions.
I would like to thank Alessandro A. Orsini for suggesting the Nano3D fabric.
The foam-based design is motivated by:
- Etymotic TIP Trodes:
- Killion, Mead C. Conductive eartip assembly. United States Patent US4781196A, filed February 20, 1987, and issued November 1, 1988. https://patents.google.com/patent/US4781196A/
- Generic foam earpieces from:
- Goverdovsky, Valentin, David Looney, Preben Kidmose, and Danilo P. Mandic. “In-Ear EEG From Viscoelastic Generic Earpieces: Robust and Unobtrusive 24/7 Monitoring.” IEEE Sensors Journal 16, no. 1 (2016): 271–77. https://doi.org/10.1109/JSEN.2015.2471183.