mne.split_label(label, parts=2, subject=None, subjects_dir=None, freesurfer=False)

Split a Label into two or more parts


label : Label | str

Label which is to be split (Label object or path to a label file).

parts : int >= 2 | tuple of str

A sequence of strings specifying label names for the new labels (from posterior to anterior), or the number of new labels to create (default is 2). If a number is specified, names of the new labels will be the input label’s name with div1, div2 etc. appended.

subject : None | str

Subject which this label belongs to (needed to locate surface file; should only be specified if it is not specified in the label).

subjects_dir : None | str

Path to SUBJECTS_DIR if it is not set in the environment.

freesurfer : bool

By default (False) split_label uses an algorithm that is slightly optimized for performance and numerical precision. Set freesurfer to True in order to replicate label splits from FreeSurfer’s mris_divide_parcellation.


labels : list of Label (len = n_parts)

The labels, starting from the lowest to the highest end of the projection axis.


Works by finding the label’s principal eigen-axis on the spherical surface, projecting all label vertex coordinates onto this axis and dividing them at regular spatial intervals.