Psychological theories of crime came to the existence around 1913, and their primary concern was to find a supporting link between crime and low intelligence. Furthermore, psychological researches found the difference of 8 points in IQ scores between delinquents and non-delinquents. Besides IQ testing in criminal psychology, other researchers dealt with personality disorders i.e. Robert Hare made an extensive research of psychopaths, sociopaths and antisocial personalities. Hare identified the mechanism and made a classification of psychopaths.
Social theories of crime
The evolution of sociological theories of crime began in 19th century and continued today.Social theories of crime researched cultural and social factors that lead to criminal behavior. Structural theoretical approach stated that certain groups within a society have less opportunities to achieve the goals most valued by a society. Society demands that people should reach social respectable goals, but acceptable methods are hard are hard to comply and goals are often unreachable in the such way. Because the opportunities are not the same for all, the society is contributing to crime. Other social theories like subcultural theories of crime have researched the discrepancy between social norms and systems of value and the norms and values of a specific subcultural group. Research of juvenile delinquency and youth gangs found that criminal behavior directed towards living up to values of delinquent subcultural group.Conflict theory states that society is based on conflict between competing social classes. Conflict theory came to the existence in 1960’s and is based on the perpetual conflict between powerless and powerful. Ecological criminology was developed in 1920’s at the University of Chicago. Theorists of ecological criminology were called Chicago school of criminology. They claimed that crime is a result of disorganized eco-areas, but have disregarded personal traits of people who live in those eco-areas. Multi factor criminology theories of criminality are integration of societal, psychological and biological/biosocial theoretical approaches to defining crime causation. Criminology multiple factor theory began its development as an interdisciplinary study to integrate valid elements of theories in a single "corpus" of crime explanations.
Biological theories of crime made the common assumptions that physical traits can lead an individual to criminal activities. Generally speaking, it was thought that physical attributes were passed down from parent to child. It was thought that the risk of committing of crimes also passed down from parents. The early biological theories of crime were focused mainly on heredity of crime, and made rather quick assumptions about the research findings.
Biological theories of crime causation