How to remove rhythmic spiking in EEG signal?
I have been having a strange spike occur in my data every couple seconds that I don't understand. Here is a picture of what it looks like in the GUI with only the ear clips attached:
How can I stop these spikes from happening?
What I have tried:
-searching the forum
-changing operating systems and computers: Linux and Windows
-changing the number of connected sensors
-updating the firmware to the latest version
I also played around with many parameters in the driver properties on Windows, though the parameters did not seem consistent with the tutorial for the latency timer at https://docs.openbci.com/docs/10Troubleshooting/FTDI_Fix_Windows
Finally, I went in to the registry to alter the latency timer there and set the value to 1.
I have attached a csv file of a run of the spikes with only the reference ear clips attached to the board.
Comments
DMan, hi.
All EEG requires THREE connections to the scalp / head:
If the channel being measured on the scalp is floating / not connected -- then much ambient EMF noise in the room will be picked up. The EEG amplifier is measuring a DIFFERENTIAL voltage between channel and reference.
Regards, William
https://docs.openbci.com/docs/01GettingStarted/01-Boards/GanglionGS
https://docs.openbci.com/docs/01GettingStarted/02-Biosensing-Setups/EEGSetup