"Brain reorganization" refers to the process of changing or rearranging the connections between brain cells. It happens when we learn or experience new things, causing our brain to adapt and organize itself to better understand and respond to the world around us.
Full definition
This
means brain reorganization at a higher level, the creation of new neural pathways and increased communication between the left and right hemispheres of the brain, essentially making you more centered and balanced; smarter, calmer, faster and happier.
At the time, Falk argued that four endocasts from southern African hominids — three Australopithecus africanus and one Australopithecus sediba — showed folding patterns that suggested that
brain reorganization was underway as early as 3 million years ago in a frontal area involved in human speech production.
Multiple lines of research point to the likelihood that
brain reorganization, the use of tools and use of a dominant hand occurred early in the human lineage.
My guess, for what it's worth, is that
brain reorganization could proceed more easily in the bigger - brained variants of any generation, just because of more room to maneuver — but that size per se wasn't the name of the game.