eye blink detection, threshold?
Hi, OpenBCI. I'm Korean Student.
I want to collect "blinking sign" in OpenBCI GUI.
I followed this tutorial.
https://docs.openbci.com/AddOns/Headwear/HeadBand/
But, I can't get a clear result like the video below.
Please help.
@wjcroft
@retiutut
@evaesteban
Comments
Han, hello.
Any eye blink artifacts in the EEG time series graph, will generally show up as much much higher than normal EEG amplitudes. So your graphs demonstrate that you are already seeing this. For example, if your baseline EEG is less than say 10 or so microvolts, and you see spikes shooting up above 80 microvolts or so, then back to baseline, those are certainly artifacts.
Your graphs also show significant mains EMF electromagnetic field artifacts at 20 Hz. Your mains is 50 Hz, but sometimes subharmonics show up. This must be taken care of to get accurate EEG baseline measurements.
Position yourself away from all power cords, extension cords, power supplies, LED lighting, conduits in floor ceilings walls, wireless gear, etc.
William
Thank you very much, Mr. William.
As you said, it worked well.
Besides "Blinking," I want to analyze "whether I'm focused" or "whether I'm thinking left or right." How is that possible?
@wjcroft
@retiutut
@evaesteban
re: focus
https://docs.openbci.com/Software/OpenBCISoftware/GUIWidgets/#focus-widget
re: "whether I'm thinking left or right."
Mentally 'thinking' left or right is not a conventional BCI paradigm. BCI does not do "thought detection". You may be instead talking about Motor Imagery.
https://www.google.com/search?as_q=motor+imagery&as_sitesearch=openbci.com
There are much better BCI paradigms available, such as,
https://www.google.com/search?as_q=mindaffect&as_sitesearch=openbci.com
https://github.com/OpenBCI/Documentation/issues/139