Genetic influences on the stability of low self-control: Results from a longitudinal sample of twins

Gottfredson and Hirschi's theory contained two propositions that have been the source of an emerging line of empirical scrutiny. First, according to the general theory of crime, levels of self-control are largely determined by parental management techniques and not by biogenic factors. Second, Gottfredson and Hirschi argued that low self-control should remain relatively stable over the life course. Data from twins drawn from the National Longitudinal Study of Adolescent Health were used to test these two hypotheses. The results of univariate model-fitting techniques revealed that genetic factors accounted for between 52 and 64 percent of the variance in low self-control, with the remaining variance attributable to the nonshared environment. Further, low self-control was stable over a two-year time period (r = .64). Bivariate Cholesky decomposition models indicated that the stability of self-control was determined almost exclusively by genetic factors, and that genetic factors also explained a moderate amount of change in self-control.     

The etiology of criminal onset: The enduring salience of nature and nurture

Based on data from the National Longitudinal Study of Adolescent Health (Add Health), the current study was the first to use measures of genetic polymorphisms (DRD2 and DRD4) to empirically examine the onset of crime. Net of the effects of race, age, gender, and low self-control, genetic polymorphisms explained variation in police contacts and arrest, but only among youths in low risk family environments. Moreover, youths with genetic risk factors experienced a later onset than youths without these risk factors. Borrowing from the behavioral and molecular genetics literatures, various interpretations of the findings are discussed as well as a call for increasingly interdisciplinary perspectives in criminology that encompass both sociological and biosocial frameworks.     

Anglicizing the United States Constitution: James Bryce's Contribution to Australian Federalism

James Bryce's analysis of American federalism made it possiblefor the Australian founders to reproduce federal institutionson the American model without replicating the republican andempirical ideas that underpinned them in the United States Constitution.Bryce's account in The American Commonwealth (1888) appealedto Australia's founders because it was suited to their needs.Bryce was English, and, like a sensible nineteenth-century Englishman,he argued that U. S. institutions had little to do with intellectualproduct. Instead, they were largely English institutions adaptedto American purposes. Reading Bryce, Australia's founders assumedthat if federal institutions had little to do with abstracttheory, and had simply been adapted to American circumstances,they might also be adapted to Australian circumstances. Thus,Bryce's approach to American federalism allowed Australia'sfounders to substitute their own colonial tradition of parliamentarydemocracy under the Crown for the republican principles of rightsand the separation of powers that underlie the U.S. Constitution.     

Are accurate witnesses more likely to make absolute judgments?

The present study tested the Two-Judgment Theory of Eyewitness Identification Accuracy. Specifically, the extent to which participants were able to engage in an absolute judgment strategy was manipulated by varying the time available to view a lineup. Providing a limited exposure to a lineup should “interrupt” decision making, whereby witnesses can only engage a relative strategy, thus leading to higher false positive responding given a target-absent lineup. Seventy-four adults viewed a 1-minute video that exposed them to an unknown target and subsequently viewed the lineup for a limited (2 s) or an unlimited amount of time. Although false positive rates were similar across conditions, accurate witnesses were more confident than inaccurate witnesses. Confidence was negatively correlated with response latency such that witnesses who took more time to make a decision were less confident in their decisions compared to witnesses who made more rapid decisions. Response latency did not differ for accurate and inaccurate witnesses. Limitations and suggestions for future research on the Two-Judgment Theory are discussed.