This research was focused on serial killers' brains and how it affects their attitudes and behavior. Serial killers' brain scans show how their brains are different than normal people's. They had deficiencies in multiple areas of the brain, such as the amygdala and prefrontal cortex, which may explain their violent tendencies and behavioral issues. The serial killers' brain scans showed a reduced amount of neuron-rich gray matter in their brains that might impact the brain emotion control center. Genetics and environment can influence people to become serial killers. The Monoamine Oxidase A (MAOA) gene, also called the killer or "warrior" gene, when combined with watching violence, may lead to violent behaviors. It is important to develop ways to anticipate gene predestination and allow for earlier intervention for impacted individuals not to become serial killers.