Interpretation of openbci data files / EDF conversion

Comments

• wjcroft Mount Shasta, CA

  March 2016

  The files output from OpenBCI_GUI are described in the header comment lines,
  
  %OpenBCI Raw EEG Data
  %
  %Sample Rate = 250.0 Hz
  %First Column = SampleIndex
  %Other Columns = EEG data in microvolts followed by Accel Data (in G) interleaved with Aux Data
  
  First number is a frame counter (a single byte) that wraps around at 255. Then the channel data in microvolts. Then the 3 Accel channels in G.
  
  You can use EDFBrowser to convert Ascii CSV files to EDF,
  
  http://www.teuniz.net/edfbrowser/
  
  William
  
  
• far12 pakistan

  March 2016

  EDFBrowser requires .template files to convert to .edf files. how do we convert text files or. csv files to template files ???

  How to know which channels data is relevant or useful and which are not ? What are accel channels ?

  Can text files or .csv files can be converted to .vhdr files ?

  
  
• wjcroft Mount Shasta, CA

  March 2016

  No that is not true. Look closer at the entire instruction manual.
  
  
• wjcroft Mount Shasta, CA

  March 2016

  http://www.teuniz.net/edfbrowser/EDFbrowser manual.html#ASCII_to_EDF_converter

  
  

  You only need to convert the EEG channels you are using. Can omit those not connected. Accel. is the accelerometer on mainboard. It has 3 axes, X, Y, Z, reported as acceleration in G force units.

  
  
• far12 pakistan

  March 2016

  thank you for the manual.It works now
• far12 pakistan

  March 2016

  is there any way that openbci driver can run in eeglab ?
• wjcroft Mount Shasta, CA

  March 2016

  Yes, LSL, use the search box in the right column to find more threads on LSL,
  
  http://openbci.com/forum/index.php?p=/discussion/334/labstreaminglayer-into-bcilab-eeglab-matlab
  
  
• far12 pakistan

  March 2016

  i have checked all the sites given in this thread and others too but still I m stuck in how to connect or run lsl with eeglab ?
• wjcroft Mount Shasta, CA

  March 2016

  Did you look at the MATLAB examples here,
  
  https://github.com/sccn/labstreaminglayer/wiki/ExampleCode.wiki
  
  EEGLAB is written in MATLAB, so can consume MATLAB objects / streams.
  
  
• far12 pakistan

  March 2016

  how can we extract features from EEG signals ?
• far12 pakistan

  March 2016

  

  
  

  what does position means over here? does it varies according to dataset? in our case, position option does not appear.
• wjcroft Mount Shasta, CA

  March 2016

  I'm not an EEGLAB user. Have you checked various documentation files such as,
  
  http://sccn.ucsd.edu/eeglab/allfunctions/pop_selectevent.html
  
  http://cognitrn.psych.indiana.edu/busey/temp/eeglabtutorial4.301/eeglabtut.html
  
  https://www.google.com/search?q=eeglab+pop_selectevent+"stimulus+position"
  
  
• far12 pakistan

  April 2016

  how do we extract features in bcilab?
• ericalee San Francisco, CA

  May 2016 edited May 2016

  This worked for us in our hackathon.

  
  

  Convertor EDF to TXT works for us using OpenBCI Ultracortex to test data: http://www.teuniz.net/edfbrowser/EDFbrowser%20manual.html#ASCII_to_EDF_converter

  And Conor gave us a thumbs up!

  
  

  -Erica and Team Ellipse

  Neurogaming Hackathon 05/15:
  

  http://www.xtechexpo.com/#!hackathon-may-14-15/pyca5