mne.make_sphere_model(r0=(0.0, 0.0, 0.04), head_radius=0.09, info=None, relative_radii=(0.9, 0.92, 0.97, 1.0), sigmas=(0.33, 1.0, 0.004, 0.33), verbose=None)[source]

Create a spherical model for forward solution calculation.

r0array_like | str

Head center to use (in head coordinates). If ‘auto’, the head center will be calculated from the digitization points in info.

head_radiusfloat | str | None

If float, compute spherical shells for EEG using the given radius. If ‘auto’, estimate an appropriate radius from the dig points in Info, If None, exclude shells (single layer sphere model).

infoinstance of Info | None

Measurement info. Only needed if r0 or head_radius are 'auto'.


Relative radii for the spherical shells.


Sigma values for the spherical shells.

verbosebool, str, int, or None

If not None, override default verbose level (see mne.verbose() and Logging documentation for more). If used, it should be passed as a keyword-argument only.

sphereinstance of ConductorModel

The resulting spherical conductor model.


The default model has:

relative_radii = (0.90, 0.92, 0.97, 1.0)
sigmas = (0.33, 1.0, 0.004, 0.33)

These correspond to compartments (with relative radii in m and conductivities σ in S/m) for the brain, CSF, skull, and scalp, respectively.

New in version 0.9.0.