'Get a SourceEstimate from morphed source to the original subject.
Parameters
src_orig : instance of SourceSpaces
The original source spaces that were morphed to the current
subject.
subject_orig : str | None
The original subject. For most source spaces this shouldn\'t need
to be provided, since it is stored in the source space itself.
subjects_dir : string, or None
Path to SUBJECTS_DIR if it is not set in the environment.
verbose : bool, str, int, or None
If not None, override default verbose level (see
:func:`mne.verbose` and :ref:`Logging documentation <tut_logging>`
for more).
See Also
morph_source_spaces
Notes
.. versionadded:: 0.10.0'

@verbose
def to_original_src(self, src_orig, subject_orig=None, subjects_dir=None, verbose=None):

    if (self.subject is None):
        raise ValueError('stc.subject    must    be    set')
    src_orig = _ensure_src(src_orig, kind='surf')
    subject_orig = _ensure_src_subject(src_orig, subject_orig)
    (data_idx, vertices) = _get_morph_src_reordering(self.vertices, src_orig, subject_orig, self.subject, subjects_dir)
    return SourceEstimate(self.data[data_idx], vertices, self.tmin, self.tstep, subject_orig)
