mris_smooth_intracortical - smoothing along the cortical surface meshes with a given tangential (neighborhood size) and radial (number of surface meshes) extent

Cite: Blazejewska, AI, Fischl, B, Waldab, LL, Polimeni. Intracortical smoothing of small-voxel fMRI data can provide increased detection power without spatial resolution losses compared to conventional large-voxel fMRI data. 2019, Neuroimage 189 (601-614).