Unfortunately, the wonderful example of Krisztián Hofstädter with a Greentek Geelfree S2 EEG cap to have real-time demo of high alpha brain waves in OpenBCI GUI has disappeared from his YouTube channel:

Last Updated on February 11, 2023 by pg@petergamma.org

Demo:

Krisztián Hofstädters YouTube channel:

https://www.youtube.com/@krishofstadter/videos

Did he do this at the wish of an EEG device manufacturer, so that the only options which is left to us is to buy a g.tec medical device?