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wjcroft

William J. Croft, Lightfield Systems, Menlo Park, CA, USA. My website on neurofeedback, biofeedback is here: http://lightfield.com/nf.htm LinkedIn profile: http://www.linkedin.com/in/wjcroft/

About

Username
wjcroft
Joined
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REGISTERED, REGISTERED_COPPA, GLOBAL_MODERATORS, ADMINISTRATORS
Website
http://lightfield.com/nf.htm
Location
Menlo Park, CA
Interests
heart-intelligence, peak performance, creativity, collaboration, mentoring, transformative technologies

Activity

  • gvzb19
    William, 

    I am noob and a mentor to two girls who have purchased and OpenBCI cyton for a science fair project.  We have encountered a problem that should be easy to get around - or maybe our understanding is wrong.

    1. The girls want to do experiments where they record the brain activity associated with stimuli using "markers".  They will epoch the EEG signals around the markers and then do classification, etc. 
    2. We need to record the EEG signals and the associated "marker" (the marker can be a number between 1 and 20 (say))
    3. The only way to get a marker into the stream (that we can find) is using openbci 3.x firmware and hitting the '`' key on the keyboard in the OpenBCI_GUI
    4. However, this only inserts a marker and not a value
    Could you give us pointers for how we can approach this, or who we can talk to about this? 

    We have brainstormed and come up with the following possibilities:


    Option 1:
    • modify the 3.X firmware to expect a second char when it receives the marker char '`' and write the value this char into one of the accelerometer streams
    • When we do the data processing we can just use the ACCELX channel as the marker channel
    • We would need to modify the OpenBCI_GUI to listen to a port (serial or UDP) and when it receives a "marker" to write the "`x" (where x is the value of the marker) to the bluetooth serial stream

    Option 2: 
    • Make changes to OpenBCI_GUI to receive the markers and insert these into the saved files 
    Option 3:
    • Stream the data to a LSL (Lab Streaming Layer) server where the LSL server can integrate "markers"
    • The problem is that LSL only saves XDF files and then we need to convert XDF files to GDF files

    Option 2 and 3 seems the simplest but the issue is that we will only get 128Hz data (since we will be limited to using the bluetooth stream)

    Any thoughts?  How have others done this?

    Thanks in advance
    Gerrie



    August 15 Comment
  • Hi William. Thanks very much for all of your insight on the BCI Forum. You mentioned on one forum an adapter that would connect the OpenBCI board to a the Electrocap. I haven't been able to find the adaptor myself and am considering using a D-sub connector and soldering the leads to the OpenBCI board directly. Is there a better way to connect? Thanks for your time! - Dereck 
    April 2016 Comment
  • William J. Croft, Lightfield Systems, Menlo Park, CA, USA. My website on neurofeedback, biofeedback is here: http://lightfield.com/nf.htm LinkedIn profile: http://www.linkedin.com/in/wjcroft/
    August 2014 Comment
  • Enjoying exploring around the new forum system.
    August 2014 Comment