Factors Affecting Aggression
Jim Fallon Keynotes - Jim Fallon's presentations explore the nature of behavioral tendencies, most notably psychopathy....
Fallon noticed that in all the specimens studied the MAOA gene was heavily expressed. The MAOA gene is sex-linked which means that individuals can only get it from their mother and which is why most serial killers tend to be males. However, in order for the MAOA gene to become expressed, the individual has to be exposed to a severe traumatic situation during early prepubescent years.
What this discovery reveals is that in areas of the world where violence is widespread, individuals are choosing mates who are particularly assertive and aggressive, creating generations of children that are particularly prone towards hostility.