brainstructures
Character vector indicating which brain structure(s)
to obtain: "left" (left cortex), "right" (right cortex)
and/or "subcortical" (subcortex and cerebellum). Can also be
"all" (obtain all three brain structures). Default:
c("left","right") (cortex only).
If a brain structure is indicated but does not exist in the CIFTI file, a warning will occur and that brain structure will be skipped.