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For example, studies show that the prefrontal cortex of a serial killer is typically less developed when compared to that of the control group of non-serial killers [2].

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Individuals with a lesser controlled limbic system, including serial killers, have more angry, violent, and primal tendencies, as well as lower self-control mechanisms in regards to fear and rage [2].It is understood that individuals may have genetic dispositions towards violence and that external factors such as an abusive childhood, can trigger violent episodes[1].Genetic explanations for serial killers’ behaviors is still being explored, and many research efforts are focused on the monoamine oxidase A gene, which regulates levels of serotonin the brain [4].Nonetheless, it is interesting to note that nine out of ten serial killers in the United States are male.A hypothesized explanation for the gender discrepancy may be linked to hormones.Serotonin is a neurotransmitter that contributes to our overall sense of happiness and positive feelings towards life.

Furthermore, levels of other neurotransmitters, dopamine and norepinephrine, are also usually higher in serial killers.

As advancements in scientific understanding and technology continue, the link between science and law becomes more pertinent.

Understanding the biology of a serial killer comes in line with the growth of a subsector of law known as “neurolaw” [4].

Males typically have higher levels of testosterone, an aggression-related hormone.

Abnormally high levels of testosterone are relatively common in men, but the combination of high testosterone and low serotonin levels are more exclusively common among serial killers[3].

Studies and ongoing research show that neurological differences in brain structure, and biological differences in hormones and genes influence what actions a person takes, including the actions of becoming a serial killer.