We saw in the previous chapter that proponents of the biological variant of the predestined actor model argue that criminal behaviour is the outcome of factors internal to the physical body of the individual human being that predisposes them to criminality. For psychological positivists, the search for the causes of crime is directed to the mind and thus we encounter notions of the 'criminal mind' or 'personality'. For purist proponents of this perspective, there are patterns of reasoning and behaviour that are specific to offenders and these remain constant regardless of their different social experiences.