Recent interdisciplinary theoretical work has suggested that social capital, or the interpersonal trust of citizens, plays an important role in explaining both the efficiency of political institutions, and in the economic performance of contemporary societies. This paper examines the relationship between social capital and economic growth in a sample of thirty-four countries over the period 1970 to 1992, within the framework of a modified neo-classical model of economic growth. The findings suggest that social capital has an impact on growth which is at least as strong as that of human capital or education, which has been the focus of much of the recent work on endogenous growth theory. It appears to have about the same impact on growth as catch-up or the ability of poorer nations to adopt technological innovations pioneered by their richer counterparts.

Political Choice in Britain uses data from the 1964 to 2001 British election studies (BES), 1992 to 2002 monthly Gallup polls, and numerous other national surveys conducted over the past four decades to test the explanatory power of rival sociological and individual rationality models of electoral turnout and party choice. Analyses endorse a valence politics model that challenges the long-dominant social class model. British voters make their choices by evaluating the performance of parties and party leaders in economic and other important policy areas. Although these evaluations may be largely products of events that occur long before an election campaign officially begins, parties’ national and local campaign activities are also influential. Consistent with the valence politics model, partisan attachments display individual- and aggregate-level dynamics that reflect ongoing judgements about the managerial abilities of parties and their leaders. A general incentives model provides the best explanation of turnout. Calculations of the costs and influence-discounted benefits of voting and sense of civic duty are key variables in this model. Significantly, the decline in turnout in recent elections does not reflect more general negative trends in public attitudes about the political system. Voters judge the performance of British democracy in much the same way as they evaluate its parties and politicians. Support at all levels of the political system is a renewable resource, but one that must be renewed.

On the basis of the connectionist model of leadership, we examined perceptions of leadership as a function of the contextual factors of race (Asian American, Caucasian American) and occupation (engineering, sales) in 3 experiments (1 student sample and 2 industry samples). Race and occupation exhibited differential effects for within- and between-race comparisons. With regard to within-race comparisons, leadership perceptions of Asian Americans were higher when race-occupation was a good fit (engineer position) than when race-occupation was a poor fit (sales position) for the two industry samples. With regard to between-race comparisons, leadership perceptions of Asian Americans were low relative to those of Caucasian Americans. Additionally, when race-occupation was a good fit for Asian Americans, such individuals were evaluated higher on perceptions of technical competence than were Caucasian Americans, whereas they were evaluated lower when race-occupation was a poor fit. Furthermore, our results demonstrated that race affects leadership perceptions through the activation of prototypic leadership attributes (i.e., implicit leadership theories). Implications for the findings are discussed in terms of the connectionist model of leadership and leadership opportunities for Asian Americans.

The decline of party activism and membership in European democracies has been well documented, but not effectively explained. This article examines the state of party membership and activism across a wide spectrum of democratic countries and shows that membership is in decline in most of them. It tests two rival explanations of the decline using a cross-sectional multi-level analysis of data from the ISSP Citizenship survey of 2004. One hypothesis is that the decline is due to ‘state capture’, or excessive state regulation brought about by an ever-closer relationship between parties and the state which has the effect of stifling voluntary activity at the grassroots level. A second suggests that parties are being undermined by the growth of relatively new forms of participation, notably cheque book participation, and consumer and Internet participation. These provide alternative outlets for political action outside traditional forms of participation such as party involvement. There is evidence to support the first of these hypotheses, but not the second.

There is increasing interest in the use of gluten- and casein-free diets for children with autism spectrum disorders (ASDs). We report results from a two-stage, 24-month, randomised, controlled trial incorporating an adaptive 'catch-up' design and interim analysis. Stage 1 of the trial saw 72 Danish children (aged 4 years to 10 years 11 months) assigned to diet (A) or non-diet (B) groups by stratified randomisation. Autism Diagnostic Observation Schedule (ADOS) and the Gilliam Autism Rating Scale (GARS) were used to assess core autism behaviours, Vineland Adaptive Behaviour Scales (VABS) to ascertain developmental level, and Attention-Deficit Hyperactivity Disorder - IV scale (ADHD-IV) to determine inattention and hyperactivity. Participants were tested at baseline, 8, and 12 months. Based on per protocol repeated measures analysis, data for 26 diet children and 29 controls were available at 12 months. At this point, there was a significant improvement to mean diet group scores (time*treatment interaction) on sub-domains of ADOS, GARS and ADHD-IV measures. Surpassing of predefined statistical thresholds as evidence of improvement in group A at 12 months sanctioned the re-assignment of group B participants to active dietary treatment. Stage 2 data for 18 group A and 17 group B participants were available at 24 months. Multiple scenario analysis based on inter- and intra-group comparisons showed some evidence of sustained clinical group improvements although possibly indicative of a plateau effect for intervention. Our results suggest that dietary intervention may positively affect developmental outcome for some children diagnosed with ASD. In the absence of a placebo condition to the current investigation, we are, however, unable to disqualify potential effects derived from intervention outside of dietary changes. Further studies are required to ascertain potential best- and non-responders to intervention. The study was registered with ClincialTrials.gov, number NCT00614198.