So while not looking for very high refresh rate or whatever but more long term average....i still found even the basic muse headband give some quite decent result. my main goals is look at alternating variation of ACS trough volition control effect over a timeframe.

For exemple, here is a session where i hover, with eye open, betwen trying to get intro deeper and softer meditation pattern tryign to see at how fast and sustain the variation in alpha brand is....and then about midway stich to much more beta/gamma dominant high single point focus practice.

https://drive.google.com/drive/folders/1fupRiNScWSr0TwKNP-bOCz5jhsWQOgsM

My main concern is that, especially for the more active focus...the sheer intensity of focus used make it VERY hard to not get any kind of muscle effect but i did try my best in the various test of "subtain gamma" to get it as stable with the least indication of muscle movement as i could...still tricky especially with the easy to disturb muse headband low sensor count.

Also, i curently have very limited analysis forstware only using quite generic graph.....curious about recomendation for potential hardware upgrade. what could help having a better quality signal and test environement and sujestion for better analytic tool. if anyone want to use they softweare to look at tsome CVS files and give insight that would be apreciated.

thanks

May I ask if anyone has any experience with MBTT by Glyn Blackett ?
It seems to be a convenient wrapper for BioEra.
Is it worth the money (if I do not have time to learn BioEra) ?
Please feel free to message me directly if for any reason you do not want your opinions to be public.
This is not a crypto-ad so I am not including the link.

Regards
Peter

Inserting the correct amplifier element is I think all I need to do in order to get the demos to run properly with my ganglion, so it is an oddly particular roadblock i am trying to get by here.

344 units available (brand-new, 2024 production)
Wireless EEG headbands – high-quality sensors, SDK available, ideal for:

• Biohacking experiments
• Research / BCI projects
• Mental performance & neurofeedback apps
• Hardware resellers

Willing to offer serious discounts for bulk orders. Shipped from the US (international shipping possible – buyer handles customs)

If you’re interested in pricing, specs, DM me here or send an email to han@listenalphabeats.com

openbci: If only daisy+cyton would be half of current price I wouldnt need to look for alternatives, but my income is nothing to western countries.

I hope for your answers
Cheers
Piotr

However, something I haven't been able to fix yet has to do with noise. While a patient is testing with the EEG cap, if someone else walks around them -- even up to 6ft away -- huge noise spikes will be introduced into the data. This happens both when the design is used on a wired connection or when it is streaming wirelessly. My guess is that this is because of large static potential differences between the patient and the person walking around them, but I'm not entirely sure. I will be doing some testing in different rooms around the office to see if it's related to the floor material, it's possible the carpet here is what's creating so much static electricity.

Have any of you experienced this with the OpenBCI boards, and if so, how did you mitigate it?

More information about the system:

• Uses a ADS1299 for data conversion
• Uses the bias amplifier sourced from all N channels
• Uses the SRB2 reference electrode internally connected to all P side channels.
• Uses a linked ear referential montage with the bias electrode on a mastoid.
• Electrode wires are kept to a short length, but are unshielded.
• Electrodes are dry comb electrodes.

Regards,
Reagan

After completing a pilot test and converting the data to CSV for inspection, I noticed that some participants' EMG, EDA, and ECG data were being recorded as negative decimals. I am curious about the possible reasons for this phenomenon and would appreciate any information you can provide.

The attached image shows a portion of the data where the values are negative.

Additional Information:
I am using the latest version of the Bitalino software and firmware.
The Bitalino board is properly connected to the participants.

Thank you for your time and attention to this matter.

I am a guy from Spain, new to EEG systems and I am thinking about buying the neuroptimal® neurofeedback system. I have heard that it is a very reliable system and better than linear EEG systems.

On the other hand, I have read that not everyone finds it effective.
Is it possible for it to work and then not? Let me explain: A subject receives a number of sessions like 25. And after two years, he returns to the sessions and they have no effect. It's possible?
Would you recommend that system over the linear one?
Can anyone who has used it give me feedback?

I am a nervous, impulsive, absent-minded person, I think about things, maybe ADD. That's why I think it's the right system for me.

Thank you so much.

Impedance values:

My hardware:

my noisy EEG signal using passive (channel 1) and active (channel 6 and 7) electrodes:

The experiment involves 4 actions: resting (eyes open), eyes closed, reading, and rhythmic tapping. Interestingly, there was significant change from rest (t test) in alpha and theta (for alpha, only eyes closed and tapping), but not for beta or gamma.

This is kind of counter intuitive since:

• From my research on the anterior-posterior gradient, it seems like higher frequency waves should be more towards the forehead, which is where the primary electrode is Reading from print (according to previous studies) is associated with increases in beta and gamma waves; so why wasn’t there a measured increase?
• A previous study also found cross scalp changes in delta, theta, alpha, and beta in eyes closed, but I only found changes in theta and alpha.

Is there any reason for this? Perhaps a principle that I'm missing?

Sorry to post a non-technical purchase question (I'd prefer to see a sticky for this question).
What do you recommend?

Thanks in advance

I have just received my 16-channel board today, what I believe to be equivalent to a Cyton + Daisy + Wifi shield (I got it second-hand, and it's an unofficial (although common) board, so the layout is just a little different). The board comes without a dongle; so connecting via Wifi is the only way I have to communicate with it.

So far I have managed to follow the WiFi setup instructions perfectly fine. The shield firmware is on 2.0.5 (the latest GH release). I'm not sure how I could find out the Cyton's firmware.

I am new to this, so may not fully know what I am doing. I was trying to set up the basics and just get a signal, but I had some problems with extremely noisy signals, then not receiving a signal at all, and having all the inputs railed. It's not completely clear to me what railing actually means, but I am assuming the DC bias is measured as being too high, and the amplifier comes in at some point and attenuates the signal or something like that. I've also failed to find a complete explanation of how the different groundings work/should be connected up (AGND, bias, SRB).

However whilst I was fiddling away, I noticed that there is a packet loss indication in the status bar of the GUI, and figured it would make sense to get to the bottom of this first. The GUI widget reports over 99% loss - which seems would be good enough reason to me for seeing all sorts of weirdness in the trace itself.

I am a bit suspicious, as the packet loss is always 99.22%. It doesn't deviate from this by more than 0.05% - I've tried a few different way to relieve this but none has resulted in any improvement whatsoever.

Variables I have tried changing:

• WiFi Direct vs using my existing Router (both AC/N and G bands on separate SSIDs)
• Taking the device outside away from noise in the building (so WiFi Direct)
• Low battery apparently can cause noise; I have tried charging. It hasn't yet reached full charge, but filling it for an hour or two hasn't seemed to make any change.
• I don't see an option in the 5.1.0 GUI to choose between TCP and UDP. I presume it's been removed in favour of always using UDPx3, but this would be an obvious thing to try if it can be changed.
• Sample Rate

I also have seen some artefacts (with no cables connected) on the trace - I believe these are the cyclical noise pattern that others have mentioned. However, I'm not completely sure I can say this is what I was seeing.

Could anyone provide any recommendations as to what I could do to diagnose this please?

Thanks a lot!

I am currently using a library that sets the Teensy 4.0 as slave to communicate via SPI with an openBCI. I would like to add to this board a teensy so I can add more features to the board. Currently I am trying to send the date to the openBCI just to test the implementation.

Before working with the OpenBCI, I tested the slave code with another teensy that serves as a master. They both worked properly, I sent a command with the teensy#1 (Master), then the teensy #2 (slave) calculated the date and sent it to the master.

When I do the same with the pic32 the data stream from the pic32 gets corrupted only when I connect the MISO to the board. While I was looking at the gui, the data stopped sending, as soon as I disconnect the MISO, the GUI keeps ploting the signals. When I connect the CS, the SCK and the MOSI while checking with the oscilloscope, the MISO sends the data correctly from the teensy (slave) to the oscilloscope. At the moment I connect the MISO to the pic, the pin voltage changes completely (both devices use a 3.3V architecture).

I tried only connecting the MISO to the Pic and the same problem happened. Maybe if someone knows about this problem or something similar. Maybe the voltages are not the same in both ports and are generating a type of shortcircuit.

Looking forward to your replies and thank you for your responses.

http://www.ti.com/tool/ADS1299EEGFE-PDK

For a 8 channels EEG Data Aquisition System:
https://www.researchgate.net/publication
/325635924_Design_of_EEG_Data_Acquisition_System_based_on_Raspberry_Pi_3_for_Acute_Ischemic_Stroke_Identification
For 32 channels EEG Data Aquisition System :
https://www.researchgate.net/publication
/332321992_Development_of_Electroencephalography_EEG_Data_Acquisition_System_based_on_FPGA_PYNQ

The ADS1299 Performance Demonstration Kit is low-cost, it has an easy-to-use evaluation software for Microsoft Windows, and it can be interfaced to MATLAB, and therefore to EEGLAB. OpenBCI has an excellent support forum, the community of low cost EEG devices is small and should cooperate. OpenBCI support for the ADS1299EEGFE-PDK would be desirable.

First of all, I would like to inform the reason for my question: the intention is to use ADS1299-4, which has 4 channels. So, what I want to understand is whether any changes to the firmware are really necessary to use it.

In the OpenBCI_32bit_Library.h library, there is the updateBoardData (boolean downsample) function, which, as I understand it, is responsible for requesting the reading of data from the ADS channels.
Part of the function:

for (int i = 0; i < OPENBCI_ADS_CHANS_PER_BOARD; i++)
  {
    for (int j = 0; j < OPENBCI_ADS_BYTES_PER_CHAN; j++)
    { //  read 24 bits of channel data in 8 3 byte chunks
      inByte = xfer(0x00);
      boardChannelDataRaw[byteCounter] = inByte; // raw data goes here
      byteCounter++;
      boardChannelDataInt[i] = (boardChannelDataInt[i] << 8) | inByte; // int data goes here
    }
  }

So, what I would like to know is what ADS responds to when we send this command inByte = xfer (0x00);
Since the intention is to leave the number of default channels, such as 8 channels, knowing if using the 4-channel ADS would not cause problems. But I would only have this security if I knew what this function xfer (0x00) does to ADS even after having finished its number of channels.

If I could sum up the question, it would be:
Would sending this xfer (0x00) command to ADS within the for with more channels than ADS actually has, cause problems? What does ADS respond by sending xfer (0x00) more times than its number of channels?

Thanks.

https://www.indiegogo.com/projects/blueberry-mental-stress-awareness-neurotech#/

I am new to this forum, but have been reading for a while and working on a custom EEG Board, basically based on the Ganglion Board but without the simblee chip and an ESP32 instead.

I also ported the Firmware of the Ganglion Board so it works on the ESP32, yet I do not want to use BLE for data transmission but a wired connection instead, since my use case requires a stable connection in noisy (wifi and cell phone packed) areas, like a trade fair.

For simplicity I prefer serial over USB (a USB Isolator will be used for security reasons of course).

Now my question is basically how, if at all, can a custom board be used with the OpenBCI GUI via serial connection?

The GUI only Shows a selection of two boards for Live Data: Ganglion and Cyton. How can I add a custom board?

Even though I basically use the same firmware from the Ganglion with the same commands (e.g. b to start the data stream, 1-4 to deactivate channels, z for impedance test etc.) obviously the Open BCI GUI would expect a Ganglion board to be connected via BLE or with the Wifi Shield.

Is there any easy way to extend OpenBCI GUI to accept also other, custom boards?

Or am I looking in the wrong place and actually I need to create my own version of the Open BCI Hub? 

But then again, how would I add a custom board to show up in the OpenBCI GUI?

Any help or link to further information on how to integrate/connect a custom board into the OpenBCI GUI would be highly appreciated.

Thanks a lot

Paul