Anxiety is accepted as a stimulus-produoing response or learnable drive to which certain delinquent behaviour is conditioned by drive reduction, and relationship between fear, anxiety and pain resistance is discussed. leg-persistence test is regarded as a pain-resistance test and is shown to be correlated with galvanic skin response fear reactivity. Persistence scores are shown to vary amongst delinquents according to hypothetical degree of stress engendered by their previous misbehaviour and current hospital confinement. High anxiety (low persistence) subjects are found to be more unstable than others; age and intelligence to have no bearing upon scores, but psychotic involvement to alter distributions markedly. data are discussed in terms of behaviour theory and Eysenck typology.