wjcroft
wjcroft
William J. Croft, Lightfield Systems, Mount Shasta, CA, USA. My website on neurofeedback, biofeedback: http://lightfield.com/nf.htm
LinkedIn profile: http://www.linkedin.com/in/wjcroft/
About
- Username
- wjcroft
- Location
- Mount Shasta, CA
- Joined
- Visits
- 19,909
- Last Active
- Roles
- Member, Administrator, Moderator
- Website
- https://lightfield.com/nf.htm
- @wjcroft
- Location
- Mount Shasta, CA
- Interests
- William J. Croft; heart-intelligence, peak performance, creativity, collaboration, mentoring, transformative technologies
- wjcroft
Comments
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@retiutut.
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https://openbci.com/forum/index.php?p=/discussion/201/large-millivolt-data-values-fbeeg-full-band-eeg
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Hi Dimitri, The short answer is that Brain Computer Interfaces, especially the non-invasive type (EEG electrodes on scalp) used in the majority of BCI research -- are not yet capable of 'verbal mind reading'. There is some early research going on…
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re: packet formats. These changed drastically between V2 and V3 firmware. The decoding function in Brainflow is entirely different between V2 and V3. What appears to be happening is that your V3 firmware packets are being interpreted (incorrectly) b…
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Clarified the PR comments noting above observations and tagging @philippitts. https://github.com/OpenBCI/OpenBCI_GUI/pull/1194 This sounds like a very simple fix, since Phil already did the hard work. Thanks again Phil.
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Nabi, hi. If you are using mixed EEG, EMG, ECG signals, you have to be very careful about your references / differential mode. EEG assumes using the board switches to select the common reference mode. Whereas ECG and EMG amplitudes are so high, t…
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Richard @retiutut, did you watch the full video link she posted? It appears with the PR, the log shows V3 firmware detected, but the time series is still totally wonky. Indicating the V3 Brainflow native Ganglion code is not getting control. @DashBa…
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Be sure to update your Zendesk ticket.
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Great, glad you found that section. As you note, the 'GUI to External Process' feature is separate from and not connected to the services provided by the Networking Widget. Hope your application works. If the complexity is daunting, you can always d…
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Repeating the previous comment, you need to log a ticket with Customer Support so that they can assign an engineer to take a look. Point them at this Forum thread. It sounds like a relatively simple fix to the Brainflow native Ganglion device routin…
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You can post Brainflow library questions on the Brainflow Slack. Sign up using the link below. https://brainflow.org/ The Networking Widget OUTPUT formats are described in the docs below. https://docs.openbci.com/Software/OpenBCISoftware/GU…
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OK !! Well that pretty much explains the issue. The Brainflow native Ganglion library is miss-interpreting what the firmware revision level is. Once it does that, the data stream will certainly appear like garbage. Which is what you see. Mentioning…
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Philip Pitts @philippitts might have some insights. I'm pretty sure he modded both the BLED dongle and native Brainflow device code to adapt dynamically to the firmware revision level. The fact that you are using the new firmware with the dongle suc…
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Please email Customer Service. If the Brainflow native Ganglion driver is misinterpreting the packets (firmware mismatch), then loss will occur.
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Another possibility is that there is a bug in the Brainflow native-Ganglion device support library routine. And that this routine does not properly adapt to the new packet format. After the firmware was developed by Philip Pitts, he also had to mod …
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Suggest emailing Customer Service at (contact at openbci.com). That way a Zendesk ticket tracker will be assigned and an engineer will be assigned to give an answer. Did you in fact upgrade the firmware on these Ganglions?
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Mentioning Richard @retiutut, @Andrey1994 Parfenov. Is it possible the firmware update to V3 firmware failed? https://github.com/OpenBCI/OpenBCI_Ganglion_Library/releases https://docs.openbci.com/Ganglion/GanglionProgram/
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Mentioning Richard @retiutut.
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@zfmeng said: What should we do further? Could you offer me some suggestions? Have you looked over this Troubleshooting page? Changing the channel may help. https://docs.openbci.com/Troubleshooting/GUI_Troubleshooting/ The GUI has a…
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I believe the GUI still has a special widget named "Packet Loss". Watching those numbers change as you reposition your Cyton and dongle can help fine tune the locations.
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Hi Zfmeng, I see from your past comments here on the Forum, that you have been using your Cyton for about 5 years with no 'unstable' issues. If you are having recent issues with the reliability of the radio connection (between Cyton and dongle), …
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@programmatix said: ... ... as they happen when I physically leave the room where the dongle needs to be - this is part of a home PSG setup. When the Cyton is in the same room as the dongle, the signal is ultra-reliable. So my impress…
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@programmatix said: ... ... the whole reason I'm doing this timestamp analysis is because I want to handle dropout periods where the Cyton couldn't communicate with the dongle). Are there any driver tweaks people can recommend? Should I be u…
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Hi programmatix, The time stamps are NOT generated inside the Cyton. Instead they only are assigned after the radio packets arrive at the laptop in the Brainflow library. Thus they are subject to various buffering delays imposed by the radio tran…
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If you watch the impedance values while it is running, you can see that it updates one channel at a time. So you can gauge how long it takes to step through all channels. It just keeps cycling, so after one or two cycles should be stabile.
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But note, if you have used that widget, it cannot run simultaneously with the data collection. It takes over the board interface because it puts the ADS1299 into the special current injection mode.
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Source code is here: https://github.com/OpenBCI/OpenBCI_GUI/blob/master/OpenBCI_GUI/W_CytonImpedance.pde
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Nicholas, hi. There is no continuous-mode steam of impedance values during the data collection. Which board are you using? Impedance is only available using the corresponding GUI widget, BEFORE you start the data collection. https://docs.op…
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Email to customer support, (contact at openbci.com).
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Pavel, hi. EEG and BCI go back many years before the recent publicity about arterial stent based EEG / BCI research. The large majority of EEG / BCI is done with electrodes on the surface of the scalp. All of the OpenBCI equipment is surface. …