How Do Public Goods Providers Play Public Goods Games?

We study how policymakers play public goods games, and how their behavior compares to the typical subjects we study, by conducting parallel experiments on college undergraduates and American state legislators. We find that the legislators play public goods games more cooperatively and more consistently than the undergraduates. Legislators are also less responsive to treatments that involve social elements but are more likely to respond to additional information that they receive. Further, legislators' fixed characteristics explain much of the variation in how legislators play the game. We discuss the implications of these findings for understanding how institutions affect the provision of public goods.     

Ontogeny of Size and Shape Sexual Dimorphism in the Pubis: A Multislice Computed Tomography Study by Geometric Morphometry

Few studies have been conducted to determine sex differences in the immature coxal bone and the results were often contradictory. The authors studied sexual dimorphic differences of the pubis using geometric morphometric analysis of five osteometric landmarks recorded by multislice computed tomography (MSCT), based on three‐dimensional reconstructions of 188 children (95 boys, 93 girls) living in the region of Toulouse, southwestern France, ranging in age from 1 to 18 years old. They used geometric morphometric methodology first to test sexual dimorphism in size (centroid size) and shape (Procrustes residuals) and second to examine patterns of shape change with age (development) and size change with age (growth). Based on statistical significance test results, the pubic shape became sexually dimorphic at 13 years old, although visible shape differences were observed as early as 9 years old. This work showed that the trajectories of pubis shape (development) and size (growth) differed throughout ontogeny and between sexes.     

Size and Shape Differences in the Distal Femur and Proximal Tibia between Normal Weight and Obese American Whites

This study tests for differences in articular and diaphyseal size and shape of the distal femur and proximal tibia between normal weight and obese individuals, and discusses the effects of obesity on the patterns of sexual dimorphism and secular change in the skeletal morphology of the knee. Measurements of the femur and tibia were recorded for 143 American White adult males and females born in the 20th century. The sample was divided into normal and obese weight categories based on the body mass index. Results show differences between normal weight and obese individuals in the size and shape of the femoral shaft and the medial side of the knee joint, none of which affect the pattern of sexual dimorphism. While changes in skeletal morphology associated with obesity may be observed in recent secular changes, its role is still unclear because of the relatively recent increase in obesity prevalence.     

Sex,Gender, Multidimensional Value Space,and Social Cultural Resistance—Afrocentrism

This article examines the applicability of the theory of multidimensional value space by Lynn A. Curtis and the theory of social cultural resistance—Afrocentrism by Daniel E. Georges-Abeyie for explaining so-called Black crime and Black juvenile delinquency in general and Black female crime and Black female juvenile delinquency in particular. It notes that the increase in so-called Black crime and Black juvenile delinquency in general and Black female crime and Black female juvenile delinquency in particular may be illusion, not fact. This article notes that perception, at times illusion, may have, and frequently does have, real outcomes, including criminal justice outcomes and delinquency outcomes. It notes that the so-called Black racial monolith is a fiction that race and ethnicity are distinct entities, as are sex and gender that the so-called Black racial monolith consists of distinct Black ethnic identities. The article notes that Black crime, female and male, and adult and juvenile delinquency may be manifestations of primary psychopathy, secondary psychopathy, and dyssocial psychopathy, as noted in the theory of social cultural resistance—Afrocentrism.     

Comparison of Commercial Kits for Recovery and Analysis of Bacterial DNA From Fingerprints

In forensic science, fingerprints are a common source of evidentiary information. However, latent examination is not always successful and trace human DNA cannot always be obtained. Thus, examining the fingerprint microbiome may offer a suitable alternative to more traditional methods of forensic identification. The Zymo Research ZR Bacterial/Fungal DNA MicroPrep™ Kit, Qiagen QIAmp^® DNA Mini Kit, Promega Wizard^® Genomic DNA Purification Kit, and the MPBio FastDNA^® Spin Kit were compared for their ability to yield a sufficient amount of bacterial DNA for next-generation sequencing in order to obtain a microbiome profile. Prints were deposited onto slides, allowed to sit for up to 1 month, and total DNA isolated and quantified using each kit. The kit from Zymo Research yielded the most concentrated DNA sample (0.0084 ng/µL) in the least amount of time as compared to other kits examined. Although this amount of DNA was far below the recommended DNA concentration threshold recommended for next-generation sequencing, a microbiome profile was successfully obtained. As interest in using the microbiome of an individual as a forensic tool continues to increase, there is the possibility that the microbiome of a fingerprint could complement traditional human DNA profiling in the future. This study provides evidence that trace amounts of bacterial DNA from fingerprints is quantifiable and sufficient for microbiome analysis.     

Can the Backlash Against Voter ID Laws Activate Minority Voters? Experimental Evidence Examining Voter Mobilization Through Psychological Reactance

Political Behavior - Research on the participatory consequences of electoral reforms that increase voting costs largely ignores how the perception that those efforts’ purpose is to...