Patch sources

Since the getting started tutorial was focused on point sources, here we provide more information that is specific for patch sources. In particular, there are two ways to construct such sources, which we describe below.

Specifying all vertices belonging to the patch (default)

By default, you are expected to provide indices of all vertices that belong to the patch in the second element of location tuples.

For example, below we define a patch in a left hemisphere (in the case of a surface source space) that contains three vertices:

sim.add_patch_sources(
    location=[(0, [123, 234, 345])],
    ...
)

And here we define two patches (with 3 and 4 vertices in left and right hemispheres, respectively) in the same call:

sim.add_patch_sources(
    location=[
        (0, [123, 234, 345]),
        (1, [0, 1, 2, 3])
    ],
    ...
)

Growing patches from the center

Alternatively, you can provide a vertex that should be used as the center of the patch and specify patch radius (in millimeters) in the extents argument. In this case, we use the mne.grow_labels() function to construct the patch.

Example 1 - single patch:

sim.add_patch_sources(
    location=[(0, 123)],
    extents=15             # in mm
)

Example 2 - several patches of different size:

sim.add_patch_sources(
    location=[(0, 123), (1, 456)],
    extents=[15, 30]       # in mm
)