[Eeglablist] finding the most negative amplitude

Victor Granic vmg at boreal321.com
Wed Mar 16 21:58:27 PST 2005


Hi there!

Introduction and disclaimer

  I'm an EEGLab/Matlab newbie.  I'm not a neuroscientist, I'm a computer
  programmer.  So, I don't understand many of the EEG concepts right now
  but I am starting to understand Matlab's capabilities as a language.


Requirements

  I need to extract all of the trial values for a specific channel
  at the most negative amplitude between a specific latency range.
  Example:  For channel 6 between latencies 200ms and 550ms I must find
  the most negative amplitude.  At that amplitude I then want to list
  all of the trial values and store them in a file.  Using the EEGLab
  GUI I can load an existing dataset and then plot a channel ERP image.
  I can then visually find the most negative amplitude giving me the
  column number and then move up the column to get the trial values.
  How do I automate this procedure without using the GUI?  I need to
  load hundreds of .set files, extract these values and save them into
  a file for importing into a spreadsheet application.


Any pointers to functions, examples, tutorials or a full explanation
would be greatly appreciated. :)

Thanks in advance!

Victor



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