code: def assign_region_to_channels(channels, anat, parc_type='aparc', max_approx=3,
                                exclude_regions=None):
      
      for one_chan in channels.chan:
          one_region, approx = anat.find_brain_region(one_chan.xyz,
                                                      parc_type,
                                                      max_approx,
                                                      exclude_regions)
          one_chan.attr.update({'region': one_region, 'approx': approx})
  
      return channels
docs: Assign a brain region based on the channel location.
  
      Parameters
      ----------
      channels : instance of wonambi.attr.chan.Channels
          channels to assign regions to
      anat : instance of wonambi.attr.anat.Freesurfer
          anatomical information taken from freesurfer.
      parc_type : str
          'aparc', 'aparc.a2009s', 'BA', 'BA.thresh', or 'aparc.DKTatlas40'
          'aparc.DKTatlas40' is only for recent freesurfer versions
      max_approx : int, optional
          approximation to define position of the electrode.
      exclude_regions : list of str or empty list
          do not report regions if they contain these substrings. None means
          that it does not exclude any region. For example, to exclude white
          matter regions and unknown regions you can use
          exclude_regions=('White', 'WM', 'Unknown')
  
      Returns
      -------
      instance of wonambi.attr.chan.Channels
          same instance as before, now Chan have attr 'region'