Age calculation using X-ray microfocus computed tomographical scanning of teeth: a pilot study

To correlate dental age with an individual's chronological age based on the calculated volume ratio of pulp versus tooth volume measured, an X-ray microfocus computed tomography unit (microCT) with 25 microm spatial resolution was used to non-destructively scan 43 extracted single root teeth of 25 individuals with well-known chronological age. Custom-made analysis software was used by two examiners to obtain numerical values for pulpal and tooth volume. The ratio of both was calculated and statistically processed. No significant intra- or inter-examiner differences were found. In fact, a very strong concordance correlation coefficient was found. Linear regression analysis showed a coefficient of determination (r) of 0.31 which suggests that there is a rather weak correlation between the volume ratio of pulp versus tooth and biological age. Although rather time consuming, this technique shows promising results for dental age estimation in a non-destructive manner using X-ray microfocus computed tomography.     

Competency, Bureaucracy, and Public Management Reform: A Comparative Analysis

Competency can be considered a central theme in contemporary public service reforms. This article analyzes the development of competency frameworks for senior public servants at the national–government level in three countries (the U.S., the U.K., and Germany). By tracing the development of competency as an idea, it is shown that competency reforms drew selectively on management ideas, and by tracing the nature and time-patterns of competency reform developments in the three countries, it is shown that competency came onto the reform agenda at different times and by various routes rather than by a simple pattern of international policy transfer or business-to-government transfer. It is argued that the adoption of competency frameworks took place at critical junctures for preexisting public service bargains or agreements in each case and that they were shaped by the particularities of institutional context. However, although competency is arguably central to public service reform, it is far from clear that the competency frameworks in these three cases contributed to the declared aims of many contemporary public service reformers.     

Political culture, alternative politics and foreign policy: The case of Israel

This article analyzes how sociopolitical dynamics within a state can help explaining foreign policy. We show that under certain conditions, the public can be involved in ways that extend beyond expressing opinions that act as constraints on policy makers, and also takes active initiatives that eventually shape foreign policies. The article explains how sociopolitical processes in Israeli society, which transformed the nature of citizen–politician relations from a top-down to a bottom-up orientation, gradually led to shifts in foreign policy regarding the conflict with the Palestinians. The Israeli public has adopted an approach to solving social problems by unilateral initiatives, as part of its attempts to shape foreign policy from the bottom up, due to continuous government failure to provide public services, combined with blocked influence channels. As long as Israeli politicians ignored these changes, they failed to mobilize support for policies imposed from the top down and lost their positions of power.     

Motivated Skepticism in the Evaluation of Political Beliefs

We propose a model of motivated skepticism that helps explain when and why citizens are biased-information processors. Two experimental studies explore how citizens evaluate arguments about affirmative action and gun control, finding strong evidence of a prior attitude effect such that attitudinally congruent arguments are evaluated as stronger than attitudinally incongruent arguments. When reading pro and con arguments, participants (Ps) counterargue the contrary arguments and uncritically accept supporting arguments, evidence of a disconfirmation bias . We also find a confirmation bias —the seeking out of confirmatory evidence—when Ps are free to self-select the source of the arguments they read. Both the confirmation and disconfirmation biases lead to attitude polarization —the strengthening of t₂ over t₁ attitudes—especially among those with the strongest priors and highest levels of political sophistication. We conclude with a discussion of the normative implications of these findings for rational behavior in a democracy.