AlexB
AlexB
About
- Username
- AlexB
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- Russia
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Comments
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William, in general I agree with you, that any reasonably integral characteristic of biophysical signals has its rights for analysis and NFB training. I’m not fanatic of highly elaborated methods of EEG analysis and do believe that even simple surf…
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@wjcroft said: Just to clarify, the reason the 'summing' operation between channels that are compared works, is that waveforms OUT of sync will cancel each other. Whereas IN SYNC waveforms will get stronger. Not bad idea for “DSP on a bud…
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In addition to William’s materials I would like to add reference to this tutorial: https://www.appliedneuroscience.com/PDFs/Brain_Connectivity-A_Tutorial.pdf Someone, who is willing to play with functional coupling metrics, whatever it could …
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https://www.hindawi.com/journals/cin/2018/1638097/ High-Frequency Oscillations in the Scalp Electroencephalogram: Mission Impossible without Computational Intelligence
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I hate to be a sort of dream destroyer, but here is another study about possible EMG sources for surface EEG gamma: https://www.sciencedirect.com/science/article/abs/pii/S138824570800045X Thinking activates EMG in scalp electrical recordings
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More info from EEG gurus: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2998274/?report=reader Scale and frequency chauvinism in brain dynamics: too much emphasis on gamma band oscillations
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In addition: https://www.sciencedirect.com/science/article/abs/pii/S1388245707001988 Scalp electrical recording during paralysis: Quantitative evidence that EEG frequencies above 20 Hz are contaminated by EMG
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Hi, Kris! I’ll do my best to find those articles in the next few days, but right now you can take a look at this open access study, dealing with these technical difficulties of non-invasive registration of high part of the EEG spectrum: https:…
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Hi @Billh! Yes, gamma spectrum is a very promising target for experiments, but it’s necessary to note that surface scalp EEG in this spectrum is very contaminated by tonic activity of scalp and neck muscles and even sporadic microsaccades. Moreo…
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Hi, Kris! I like the way you set key points for your project: eeg sonification. It can grab not only average main power characteristics, but their dynamics as well. If you can record brain sounds of recognized meditation expert during meditation …
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Dear William, Thank you for your comment and clarifying information! Frankly speaking, I’m not an expert in the field of meditative practices. For me “meditation” is a quite proper term for just aimless sitting on a sofa with glass of good …
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Hi, Kris! As far as I understand, typical face muscle artifacts mainly effect high beta and above spectrum, i.e. >20 hz, but, yes, periodic jaw movements and eyes blinking sometimes could give effects to lower part of EEG. For persons without…
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Dear Kris! Your system looks perfect, but I could note, that from conceptual point of view, it is a bit outdated idea, that mere elevation of theta power is a reliable way toward meditative state. Surface EEG theta has a lot of sources inside …
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Hi, William! Thanks for your interest and feedback! As for me, both modules are original and were bough by me directly from OpenBCI online shop. I’ve just found @mystery post in this particular section and replied accordingly. Your idea …
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Hi, @mystery. Your WiFi shield symptomatology looks very similar to mine. It seems to be sort of parasitic interference between WiFi ESP module’s internal antenna and circuits of Cyton board, placed beneath WiFi shield, that degrades WiFi conn…
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Dear @retiutut, thank you for feedback! Actually, it is widely accepted general rule for board design to avoid any plains above/below PCB antenna trace in order to avoid unwanted coupling between components. That’s why we can frequently see PC…
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Dear William! Thank you for appreciation! Yes, in view of current unstable international political situation, it’s time to think about extra safety :-)
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Pictures: https://drive.google.com/file/d/1VPbn3V4fDEV38j5cN8Iw1_JWUKBm6MEz/view?usp=drivesdk https://drive.google.com/file/d/1vOLvC6bt8fyAH5rdw6jicATiE23Zc1RF/view?usp=drivesdk https://drive.google.com/file/d/18zYhFDIfnAs_5gNZqxwUAmWmsi1TU…
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Dear William, Thanks for prompt details explanation! Now all is clear for me! Yes, I’m very interested in WiFi support of BrainBay and plan to play a bit with BrainBay source, kindly provided by Chris. Hopefully within this month I can be able to …
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Dear wjcroft! Thanks for great news! Only one moment for clarification, please: according to Chris’ comments about usage of OpenBCI Hub for communication with Ganglion, in this new release BrainBay still uses middleware OpenBCI Hub interface to co…
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Hi, it should be declared at customs as an "oscilloscope", not medical or clinical or EEG device in any way.
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Hi William! Thank you for very interesting information! It's absolutely new thing for me! With all due respect to such ambitious terms like "transformative" or "wellness", I would like to note, that v1bes authors didn't tell much (if any…
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William @wjcroft and others interested! Let me revive this interesting topic. Here, I would like to draw your attention to such very promising neurostimulation approach as tVNS - transcutanious vagus nerve stimulation. Classical vagus…
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Well, just to close this thread: After careful viewing of schematics, all my niggles to OpenBCI amps re possible phase distortions should be cancelled. So, we have great things for further advanced EEG phase analysis! Correct phase processing is v…
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Oops! Dear William, sorry for being too impulsive and inattentive! I just missed this important thread! Thanks a lot for this reference and I will read all this material very carefully and would add some considerations. Thanks again, Best, A…
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Dear @wjcroft, thank you for bringing attention to the question and 2 @biomurph for prompt reply and great news! So, all current Ganglion stock in openbci store has only units with updated schematics, right? Also, Please correct according section …