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• Thanks Alex and Billh, If you can record brain sounds of recognized meditation expert during meditation session, then any novice can further try to reproduce this “tune” by his/her own. Yes, this is a very good idea. I have a few medit…

  in could you give me some feedback on a `neuro-feedback with music` demo? Comment by khofstadter September 2019
• Many thanks Alex and William, Yes, there are protocols from Jeff available for both, 2 channel surface and S LORETA: [ from 26:13 min ] After yours and other people's feedback I am now considering having a less 'goal' oriented system. Pe…

  in could you give me some feedback on a `neuro-feedback with music` demo? Comment by khofstadter September 2019
• Dear Alex, Many thanks for your positive reply, constructive feedback and the link to the paper. Another issue I was told with using theta in neuro-feedback is, that muscle movements (jaw, eye blinks) can contaminate this bandwidth (4-8hz). S…

  in could you give me some feedback on a `neuro-feedback with music` demo? Comment by khofstadter September 2019
• Thanks.

  in what is the minimum distance between battery and open bci board? Comment by khofstadter September 2019
• thanks William. The water I make is 2.5% - I guess it's fine. Maybe there are other reasons for having more grey hair

  in does saline water in an EEG cap damage hair or skin on the head if used often (daily)? Comment by khofstadter September 2019
• Thanks William, very good to know.

  in what is the minimum distance between battery and open bci board? Comment by khofstadter September 2019
• Great, thanks William. I'll investigate.. and update if I can. k

  in can we connect two cytons to one computer and read their EEG simultaneously? Comment by khofstadter August 2019
• Thanks for clarifying this.. I think I am getting there ...  

  in how to calculate impedance (in other software)? Comment by khofstadter July 2019
• ... now, when pressing the impedance button in the gui, the 31.5hz signal is only introduced to the relevant channel. Good.  My understanding at the moment from the other software is that  message 'z 1 1 0 Z' adds the 31.5hz signal to all chan…

  in how to calculate impedance (in other software)? Comment by khofstadter July 2019
• quick update:  now when i measure impedance on one channel, only one channel shows the peak in the fft plot:  https://www.dropbox.com/s/xfywsv2vp1gc6jc/20190731-sc-impedance03.jpg?dl=0 i will investigate a bit .... 

  in how to calculate impedance (in other software)? Comment by khofstadter July 2019
• Hi William,  I think I might need some more guidance. I made a short video which might help understand what I struggle with:  Based on how the messages 'z 1 1 0 Z' and 'z 1 0 1 Z' effect the plot in another software (see pictures below) I thin…

  in how to calculate impedance (in other software)? Comment by khofstadter July 2019
• Thanks William, I will experiment. The S3 arrived, I should try it soon, maybe it is tighter than the S1. 

  in how to read EEG with cap when user is laying down? Comment by khofstadter July 2019
• Thanks William. k

  in is it worth switching off the steaming of accelerometer data if I don't use it? Comment by khofstadter July 2019
• Yes, I am glad I don't need to measure downward facing dogs I guess making the electrodes and the head/hair as wet as possible is one good idea. Can salty water evaporate fast in room temperature?

  in how to read EEG with cap when user is laying down? Comment by khofstadter July 2019
• many thanks Bill. When using electrodes with saline water, is it possible that laying down instead of sitting makes impedance worse faster while measuring. I started with <5kOhm and ended up with >100kOhm after 40 minutes. Maybe I just have …

  in how to read EEG with cap when user is laying down? Comment by khofstadter July 2019
• thanks!

  in is it worth switching off the steaming of accelerometer data if I don't use it? Comment by khofstadter July 2019
• oh, now I see that pattern!  silly question - thanks. 

  in what is the last number in the row in the saved data file? Comment by khofstadter July 2019
• cheers, this is useful. k

  in cleaning paste from cup electrodes after use Comment by khofstadter July 2019
• Hmm... and I always thought it is better to use Station mode as it can be faster... I'll experiment.  .. also, thanks for the Android link.. didn't know...  many thanks William. k

  in which cyton and wifi-shield firmware and openbci gui version works well together? Comment by khofstadter July 2019
• Thanks William. I forgot to mention, I use WiFi Station with a modem that is only for this project, not with the one we use for internet.  I should check the other modem... 

  in which cyton and wifi-shield firmware and openbci gui version works well together? Comment by khofstadter July 2019
• Thanks, I probably never read this disclaimer and assumed that Cyton+Wifi will work easily...  @pushtheworld @techsupport @Conor  : Do you know anyone how works with Cyton+Wifi? 

  in which cyton and wifi-shield firmware and openbci gui version works well together? Comment by khofstadter July 2019
• Thanks William. I'll try... 

  in how to calculate impedance (in other software)? Comment by khofstadter July 2019
• hello,  I did some tests with filters off and then compared the signal with bluetooth signal at the end of the video:  same system as above using OpenBCI_GUI_v4.1.3-beta.1 issues:  1. UDPx3 not connecting; 2. signal is still jumping ar…

  in fft signal jumps around 50hz - what does this indicate? Comment by khofstadter July 2019
• thanks both. This is good. 

  in are there issues with having the wifi-shield on Cyton while recording via serial/bluetooth/usb? Comment by khofstadter July 2019
• thanks. I'll experiment with the filter as well next time. 

  in fft signal jumps around 50hz - what does this indicate? Comment by khofstadter July 2019
• Thank William,  UDPx3 was the only one not working at all, see video from 5:38.  I tried with both GUI versions (maybe I should try with an earlier version). There are two logs in relation to this in my last github issue responsehttps://github.co…

  in fft signal jumps around 50hz - what does this indicate? Comment by khofstadter July 2019
• Thanks techsupport. I ordered the LiPo Battery. 

  in how does low battery level affect the signal? Comment by khofstadter July 2019
• Thanks, k

  in what is the relationship between high impedance on EEG channels and 50/60hz noise? Comment by khofstadter July 2019
• thanks William,  yes, I the Greentek has passive electrodes, no small circuits on the cap.  I was told that science papers ideally want you to have your impedance around or lower than 5 Kohm. Is this still true or was this relevant only in the pas…

  in what is the relationship between high impedance on EEG channels and 50/60hz noise? Comment by khofstadter July 2019
• quick update on the Greentek cap: I managed to reduce the impedance by using more salt in the saline water. My previous calculations for 3.5% saline solution were wrong, now they are correct.  I also made some distilled water as it turned out that…

  in Greentek Gelfree-S EEG Cap Comment by khofstadter July 2019
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