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
- 21,511
- 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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https://docs.openbci.com/GettingStarted/Biosensing-Setups/ExGSetup/
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Hoyt, thanks for posting your open source project. I did find this document in your Github which provides a bit more background: https://github.com/hbanks87/praycg-open/blob/main/docs/PRAYCG_Working_Theory_PUBLIC_v0_6.pdf Can you elaborate …
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Aaron, thanks for your post and offer. One other place you should consider posting is the Slack run by NeuroTechX, there are thousands of researchers, students, makers that monitor the posts there. Pull down the Community tab on this website, the…
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Sarthak, Thanks for making this available to the community, via our Forum. You can also make a post on the 'Community' section of the OpenBCI website. Instructions: https://openbci.com/community/ https://docs.openbci.com/GettingStarted/Com…
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@ty704366451, hi. You mention, "I can offer a free set of my own-made kits for collecting brain waves". So do you have a website or way to order such kits? I'm unclear how you are financing this, as EEG kits, circuit boards, etc, generally have s…
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Mentioning Richard, @retiutut the GUI dev.
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Payam, Thanks for these great replies. William
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Because your millivolts signal is so slowly moving, you must remove any filter that cuts off the sub 1 Hz frequencies. GUI displays have already applied the filters. This applies to all windows. However, the recordings are always raw, no filters.
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https://docs.openbci.com/Software/OpenBCISoftware/GUIWidgets/#filters
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A true signal tens of millivolts is in the range of 10,000 uV for Cyton. This is easily seen. But you will need to turn off any high pass filters to see it. The default OpenBCI_GUI filter spec may be something like a bandpass from .5 Hz to 40 Hz.
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Your Cyton setup is the same as used in EEG. Yes, only the bottom pins are used and SRB2 is reference. Cross talk unlikely. What amplitudes are you seeing? Cyton is sensitive enough to measure down to low microvolts range, below say 4 uV. But also n…
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Arianna, hi. What you are seeing with the same amplitude on different leaves, is likely because the 'impedance' or surface resistance in ohms of plant tissue, is very low. The plant cells, filled with water and dissolved minerals are essentially …
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A couple preliminary questions. With the 3D source localization features, do you think that the 16 channels of OpenBCI Cyton + Daisy would provide 'usable' resolution for a simple neurofeedback protocol that say rewards a threshold of amplitude at a…
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Payam, wow. This is a fantastic contribution to the BCI / neurofeedback / EEG community. I see you are the primary author. To expand your links: Github: https://github.com/mne-rt-org/mne-rt Documentation: https://mne-rt-org.github.io/…
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James, hi. There is a wider community of neurotech and EEG enthusiasts here: https://neurotechx.com/ Pull down the 'Community' tab there. You can sign up for their Slack, which is a general bulletin board. They also have chapters and studen…
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@Bruce276 said: ... An additional question if anyone could answer it, where might I find a good site to buy EEG caps at 3 different sizes (large, medium, small) that would be compatible with these electrodes. Something like this cap I found on…
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Bruce, hi. Just dousing / spraying them with isopropyl alcohol is probably sufficient. You want to avoid 'rubbing' the AgCl electrodes, because the chloride plating is thin. William
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@nugroho_budi said: ... I read here: https://openbci.com/forum/index.php?p=/discussion/2223/is-my-cyton-broken-non-responsive-after-attempted-firmware-upgrade#latest that @wjcroft mentioned RadioPassThru32bit is just a dummy code, so i just…
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He purchased the unit directly from OpenBCI, so it should have bootloader installed.
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That's great progress. Hoping that @danysab might pop in here with any suggestions.
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@ty704366451, hi. You posted a photo. But did not leave any text comment. 你发布了一张照片，但没有留下任何文字评论。 You can use Google Translate to transform Chinese into English: 您可以使用谷歌翻译将中文转换为英文： https://translate.g…
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Hi Jiong, Your Fp1 channel seems to have both huge deflections (eye blinks, head motion?), but also what may be large amounts of mains noise (the high frequency noise) that seems to recur in bursts about 5 times per second. Are you using a notch …
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George, that sounds great. Do you have any links to a website, Github, etc., with more details, instructions, tutorials, etc.? So it sounds like there are two methods of gathering the ClinicalQ assessement: either with a separate app that read…
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Did you find a solution?
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Your photo is from March? Please describe in text what you found to work. Your header connectors appear to be the right width in that photo. So all channels should connect
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Hi Giuliano, As you can see from your last screenshots in the FFT plot, the noise is AC power line (mains) related, with the 50 Hz huge component. You have a notch filter set at 50 Hz, but in your case the mains noise is overwhelming the notch. …
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No. You are misunderstanding what SRB2 does. It 'gangs' together all the upper row pins to become the common reference electrode. I don't know what header pin female connectors you are using, but they sound too large or malformed. Here is an exam…
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Please read this comment regarding acceptable Cyton impedance ranges, https://openbci.com/forum/index.php?p=/discussion/comment/13328/#Comment_13328 Your '20K ohm' figure is obsolete, given that the Cyton (ADS1299) amplifier input impedance is…
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Hi GG, You mention that you changed the SRB1 / SRB2 settings. Don't do that. Use the default which is SRB2. Also use the default pins, which are the 'bottom' pins closest to the board surface. Use the suggestions on the tutorial: https://docs.…
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Hi Nugroho, It would be best if your Cyton (mainboard and 2 RFduinos) was running the latest firmware. However, that upgrade process is fairly daunting. I suggest you email to (contact at openbci.com) and open a Customer Support ticket. Point the…