Funny today whenever someone has extra brain tissue we call it a tumor. Furthermore the notion that what your ancestors do can influence you gentically has been proven to be wrong.
Those interested in the evolutionarily acquired behavioral predispositions should read Robert Ardrey’s African Genesis.
More hard data, in less space, and more easily read than any book on this subject since the publication of African Genesis in the mid 1960’s.
There is a reason that MITS & WITS bought foot noted non fiction in such numbers that this book was on the NYT best seller list for many months.
Oops - MITS = Man In The Street
WITS = Woman In The Street
Hmm. Crocodile as brain food. Perhaps that’s why the amydala has often been considered the most primitive ‘reptilian’ part of the brain controlling the fear/fight responses.
The amygdala has also been implicated in emotional states associated with aggressive, maternal, sexual, and ingestive (eating and drinking) behaviors. Less is known about the detailed circuitry involved in these emotional states than is known about fear.