Abstract
This article argues for a central role for personality in mediating between the genetic and environmental forces which act as causal agencies on the one hand, and the criminal behaviour that is to be explained on the other. Such a causal chain must of course also incorporate the biological-hormonal intermediaries between DNA and personality. In addition we require an explanation for the specific behaviours that make up anti-social conduct, and it is suggested that this is to be found in Pavlovian conditioning. The evidence relating to these theories is reviewed, and suggests a fairly definite framework which also leads to some suggestions concerning the reduction of criminality.