Differences

This shows you the differences between two versions of the page.

Link to this comparison view

reference:ft_lateralizedpotential [2018/08/23 14:43] (current)
Line 1: Line 1:
 +=====  FT_LATERALIZEDPOTENTIAL =====
 +
 +Note that this reference documentation is identical to the help that is displayed in MATLAB when you type "help ft_lateralizedpotential"​.
 +
 +<​html><​pre>​
 +  <a href=/​reference/​ft_lateralizedpotential><​font color=green>​FT_LATERALIZEDPOTENTIAL</​font></​a>​ computes lateralized potentials such as the
 +  lateralized readiness potential (LRP)
 + 
 +  Use as
 +    [lrp] = ft_lateralizedpotential(cfg,​ avgL, avgR)
 + 
 +  where the input datasets should come from <a href=/​reference/​ft_timelockanalysis><​font color=green>​FT_TIMELOCKANALYSIS</​font></​a>​
 +  and the configuration should contain
 +    cfg.channelcmb = Nx2 cell array
 + 
 +  An example channelcombination containing the homologous channels
 +  in the 10-20 standard system is
 +     ​cfg.channelcmb = {'​Fp1' ​  '​Fp2'​
 +                       '​F7' ​   '​F8'​
 +                       '​F3' ​   '​F4'​
 +                       '​T7' ​   '​T8'​
 +                       '​C3' ​   '​C4'​
 +                       '​P7' ​   '​P8'​
 +                       '​P3' ​   '​P4'​
 +                       '​O1' ​   '​O2'​}
 + 
 +  The lateralized potential is computed on combinations of channels and
 +  not on indivudual channels. However, if you want to make a topographic
 +  plot with e.g. <a href=/​reference/​ft_multiplotER><​font color=green>​FT_MULTIPLOTER</​font></​a>,​ you can replace the output lrp.label
 +  with lrp.plotlabel.
 + 
 +  The concept for the LRP was introduced approximately simultaneously in the
 +  following two papers
 +  - M. G. H. Coles. Modern mind-brain reading - psychophysiology,​
 +    physiology, and cognition. Psychophysiology,​ 26(3):​251-269,​ 1988.
 +  - R. de Jong, M. Wierda, G. Mulder, and L. J. Mulder. Use of
 +    partial stimulus information in response processing. J Exp Psychol
 +    Hum Percept Perform, 14:682-692, 1988.
 +  and it is discussed in detail on a technical level in
 +  - R. Oostenveld, D.F. Stegeman, P. Praamstra and A. van Oosterom.
 +    Brain symmetry and topographic analysis of lateralized event-related
 +    potentials. Clin Neurophysiol. 114(7):​1194-202,​ 2003.
 + 
 +  To facilitate data-handling and distributed computing you can use
 +    cfg.inputfile ​  ​= ​ ...
 +    cfg.outputfile ​ =  ...
 +  If you specify one of these (or both) the input data will be read from a *.mat
 +  file on disk and/or the output data will be written to a *.mat file. These mat
 +  files should contain only a single variable, corresponding with the
 +  input/​output structure.
 + 
 +  See also <a href=/​reference/​ft_timelockanalysis><​font color=green>​FT_TIMELOCKANALYSIS</​font></​a>,​ <a href=/​reference/​ft_multiplotER><​font color=green>​FT_MULTIPLOTER</​font></​a>​
 +</​pre></​html>​