Biosocial criminology

Biosocial criminology is an interdisciplinary field that aims to explain crime and antisocial behavior by exploring both biological factors and environmental factors. While contemporary criminology has been dominated by sociological theories, biosocial criminology also recognizes the potential contributions of fields such as genetics, neuropsychology, and evolutionary psychology.

Environment has a significant effect on genetic expression. Disadvantaged environments enhance antisocial gene expression, suppress prosocial gene action and prevent the realization of genetic potential.

Genes and environments operating in tandem (interacting) were required to produce significant antisocial behavior, while neither was powerful enough to produce it independent of the other. That is, children genetically at risk for antisocial behavior reared in positive family environments did not display antisocial behavior, and children not at genetic risk did not become antisocial in adverse family environments.

One approach to studying the role of genetics for crime is to calculate the heritability coefficient, which describes the proportion of the variance that is due to actualized genetic effects for some trait in a given population in a specific environment at a specific time. The heritability coefficient for antisocial behavior is estimated to be between 0.40 and 0.58.

Another approach is to examine the relationship between neurophysiology and criminality. One example is that measured levels of neurotransmitters such as serotonin and dopamine have been associated with criminal behavior. Another is that neuroimaging studies give strong evidence that both brain structure and function are involved in criminal behaviors. The limbic system creates emotions such as anger and jealousy that ultimately may cause criminal behavior. The prefrontal cortex is involved in delaying gratification and impulse control and moderates the impulses from the limbic system. If this balance is shifted in favor of the limbic system this may contribute to criminal behavior. Terrie Moffitt's developmental theory of crime argues that "life-course-persistent offenders" make up only 6% of the population but commits more than 50% of all crimes and that this is due to a combination neurophysiological deficits and an adverse environment that creates a criminal path that is very difficult to break once started.

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