eelbrain.xhemi

eelbrain.xhemi(ndvar, mask=None, hemi='lh', parc=True)

Project data from both hemispheres to hemi of fsaverage_sym

Project data from both hemispheres to the same hemisphere for interhemisphere comparisons. The fsaverage_sym brain is a symmetric version of fsaverage to facilitate interhemisphere comparisons. It is included with FreeSurfer > 5.1 and can be obtained as described here. For statistical comparisons between hemispheres, use of the symmetric fsaverage_sym model is recommended to minimize bias [1].

Parameters:

  • ndvar (NDVar) – NDVar with SourceSpace dimension.

  • mask (bool) – Remove sources in “unknown-” labels (default is True unless ndvar contains sources with “unknown-” label).

  • hemi (str) – Hemisphere onto which to morph the data.

  • parc (bool | str) – Parcellation for target source space; True to use same as in ndvar (default).

Returns:

  • lh (NDVAr) – Data from the left hemisphere on hemi of fsaverage_sym.

  • rh (NDVar) – Data from the right hemisphere on hemi of fsaverage_sym.

Return type:

(<class ‘eelbrain._data_obj.NDVar’>, <class ‘eelbrain._data_obj.NDVar’>)

See also

morph_source_space

lower level function for morphing

Notes

Only symmetric volume source spaces are currently supported.

References