brainstructures
Character vector indicating which brain structure(s)
to obtain: "left" (left cortical surface), "right" (right
cortical surface) and/or "subcortical" (subcortical and cerebellar
gray matter). Can also be "all" (obtain all three brain structures).
Default: "all".
If a brain structure is indicated but does not exist, a warning will be raised and that brain structure will be skipped.