ABSTRACT
We should not be surprised that Gall regarded the cortical hemispheres as “mirror image duplicates” of one another, with the same mental faculties located homotopically (at the same relative location) in each-after all, the brain, like most other components of the nervous system, is superficially symmetrical along the midline. But closer inspection reveals many differences in structure, and behavioural studies suggest intriguing differences in function too.
