chipaudette
chipaudette
About
- Username
- chipaudette
- Joined
- Visits
- 268
- Last Active
- Roles
- Member
Comments
-
When we were working with this head phantom, the challenge that we never fully overcame is that the DC baseline of our EEG signals wandered around a lot when using the phantom. Our human subject gave pretty stable near-DC signals over our relativel…
-
While not related to 3D printing an EEG head phantom, I did just recently publicly release a report that I wrote back in 2016 regarding an EEG head phantom that we made using conductive plastic (injection molded, not 3D printing). If you're interes…
-
I'm loving the image of a cantaloupe with EEG headgear. Totally cracking me up. We had the most success with Protopasta PLA. It's too conductive to properly represent human flesh, but it's not like copper or anything. Scalp and brain is somethi…
-
So glad that you got it to work! Chip
-
Cool paper. We tried (and did) use doped silicones...but their addition of a lubricant to help the mixing process was something that we didn't consider. I'm not familiar at all with the implications of adding such a lubricant, but it sure did seem…
-
As a small bit of help, an OpenBCI data file is just a text file, so you can open it in any text editor...notepad, Word, or whatever. The top of the file describes the contents... %OpenBCI Raw EEG Data % %Sample Rate = 250.0 Hz %First Column =…
-
Sorry for the slow reply on all of this. Yes, I believe that EEG phantoms are very useful for confirming that your EEG gear is working correctly. Actually, to be more precise, I think that an EEG phantom is very important for making sure that your…
-
If the auditory stimulation is steady in frequency, shouldn't the auditory response also stay steady in frequency? If will not be "noise" in the FFT. It will be a tone that can fit in one bin. So, as you get more and more bins (for a fixed sample…
-
If you would like to create your own signal conditioning, you should look at other projects that use discrete components, rather than OpenBCI which uses the built-in capabilities of a monolithic chip like the ADS1299. A good example where you can …
-
OpenBCI just tweeted this video of someone using OpenBCI to drive percussion sounds... Chip
-
Hi roihamer, I've got some experience on this issue...for our brain-controlled shark hack, we connected five people to a single OpenBCI unit. My write-up is linked below, including pictures of how we connected ourselves to my OpenBCI unit and inc…
-
Here's a well produced video of a Berklee professor using an EEG headset to drive a modular synth. Not great sounds being demonstratted, but it is a nice little video... http://artery.wbur.org/2015/09/16/music-future-boulanger Chip
-
William's comments are all correct, daisy chaining the hardware to keep them sample-accurate synchronized will require some hardware surgery...and even if you were successeful, the 8-bit microcontroller might not be fast enough to keep up. Running …
-
Hi Mike, I've not been able to try the fix in quite some time, so I'm not sure what the software does at the moment. Based on my memory of what I was hoping to implement, I think that your expectation is correct...if you change the gain of a c…
-
When I wrote the initial GUI, all of the plots were intended to be showing microvolts. More specifically, it was intended to be "microvolts as seen at the overall input to OpenBCI". Or, said another way, the GUI should be showing the voltages prod…
-
To the original question, the last time that I looked at the OpenBCI GUI code, it was indeed incorrect in that it always assumed a gain of 24x, even if the user selected a smaller value. That is a bug. There was a branch of the OpenBCI_GUI that w…
-
I am confused about what you want to do. Are you trying to do real-time filtering in Matlab? Or are you trying to do it in Processing? Chip
-
The male touch-proof jacks are a bit expensive and they're pretty large...especially if you're putting 10 on there (8 EEG chan + 1 for the reference + 1 for the bias). So, before you jump in with your own board, do be aware of the increase in size …
-
To partly address my own question above -- how big an area do the LEDs need to cover to evoke the SSVEP response -- I just watched a video posted by @wjcroft on a different thread. That thread was on BCI for musical applications. In the video, the…
-
Hi, That's my blog post that William linked to. While I was able to get the flashing to work on my laptop, the same movie would not blink steadily on my other laptop. It was very frustrating. So, I think that it would be great if you could get…
-
ECG and EKG are the same thing..."electrocardiogram". http://en.wikipedia.org/wiki/Electrocardiography Chip
-
Hi User93, Wow, where did you find OpenBCI_GUI_Simpler? That's some old code! It is no longer supported. The only software (in Processing) that works with OpenBCI V3 is here: https://github.com/OpenBCI/OpenBCI_Processing Chip
-
Hi Yen, With no electrodes connected you *should* see large amounts of noise. This is true for any EEG system. Without being connected to your body, the unconnected pins on the OpenBCI board act like little antennas. They will pick up all sorts…
-
Hi...EEGHacker here... I converted the MAT files over to OpenBCI formatted CSV files. I pushed them up to the EEGHacker GitHub, so you should be able to get them. Be aware that the data that was in the MAT files had been normalized, so I di…
-
Collecting raw ECG data is very easy with OpenBCI. For example, I've done it: http://eeghacker.blogspot.com/search/label/ECG and Autodidacts has done it: http://www.autodidacts.io/getting-started-with-openbci-a-tutorial-on-testing-troubl…
-
I looked at the photos, too. wjcroft has good eyes...it does indeed look like you plugged into the wrong pins on OpenBCI. I get this wrong sometimes, too. With the default configuration of OpenBCI (as set via the GUI), you need to plug into the b…
-
Hmm. I've never seen the errors that you mention. Sorry! Hopefully the guys at OpenBCI have seen those errors and know what to do... Chip
-
Did you try my voodoo "solution", posted above? >>> Then, I found that there was some additional voodoo that you had to do. Specifically, I found that I had to have the OpenBCI board turned off during while the program was compiling. T…
-
Hi @TJHSSTResearch, After you take a look at the material discussed here, but sure to post what you've tried...especially where you put the electrodes on your head, where you plugged them into your OpenBCI board, and what you did to try to get you…
-
One of the key differences between the shock hazard during everyday life and the shock hazard during electrophysiologic measurements (EEG, ECG, etc) is that in everyday life you've got a fairly insulating layer (10s to 100s of kOhm) insulating layer…