I’m just throwing it out there, unsure if I believe it yet.
Source of hemisity
According to the concept of hemisity, the dominant executive systems, or the will of individuals, must reside in one hemisphere. That is, proponents of this perspective maintain that individuals cannot be governed by two conflicting agents. Thus, agency or will must ultimately be underpinned by one of the two hemispheres.
If this executive system is located in the left hemisphere, the perception of individuals is more dependent upon their goals, called top-down thinking, and more confined to specific details. [n.b. ACC also has a role in negative impulse suppression, higher-function consistency and resolving cognitive dissonance with logic] In contrast, if this executive system is located in the right hemisphere, the perception of individuals is more sensitive to features in the environment as well as more focused on global patterns. [polite way of calling them short-term emotional thinkers]
The anterior cingulate tends to be larger in one hemisphere than in the other hemisphere….. [structural studies]
I’d be interested on seeing structural MRI studies on it between the two.