Preregistration in infant research—A primer

Preregistration, the act of specifying a research plan in advance, is becoming more common in scientific research. Infant researchers contend with unique problems that might make preregistration particularly challenging. Infants are a hard‐to‐reach population, usually yielding small sample sizes, they can only complete a limited number of trials, and they can be excluded based on hard‐to‐predict complications (e.g., parental interference, fussiness). In addition, as effects themselves potentially change with age and population, it is hard to calculate an a priori effect size. At the same time, these very factors make preregistration in infant studies a valuable tool. A priori examination of the planned study, including the hypotheses, sample size, and resulting statistical power, increases the credibility of single studies and adds value to the field. Preregistration might also improve explicit decision making to create better studies. We present an in‐depth discussion of the issues uniquely relevant to infant researchers, and ways to contend with them in preregistration and study planning. We provide recommendations to researchers interested in following current best practices.     

Anti-Semitic Attitudes in Europe: A Comparative Perspective

The article uses available survey data to depict the depth and spread of anti-Semitic attitudes across Europe. The main assumption is that European anti-Semitism, both currently and historically, is closely tied to issues and crises of national self-identification; for this reason, social identity theory is employed to study the varying configurations of anti-Semitic prejudice. In most European countries, Jews are a small and socially integrated minority. Attitudes toward them are determined less by concrete experiences of cultural differences, or conflicts over scarce resources, but rather by a perceived threat to the national self-image. This leads to an accentuation of the pertinent prejudices that blame Jews to be responsible for that threat. This perspective brings to light considerable differences between Eastern and Western Europe and the continuing influence of national traditions.     

Fertility tourism: circumventive routes that enable access to reproductive technologies and substances

“Fertility tourism” is a journalistic eye‐catcher focusing on the phenomenon of patients who search for a reproductive treatment in another country in order to circumvent laws, access restrictions, or waiting lists in their home country. In Europe, the reasons why people seek reproductive treatments outside their national boundaries are quite diverse, in part because regulations differ so much among countries. Beginning with four examples of people who crossed borders for an in vitro fertilization (IVF) treatment with gamete donation, this article provides some insight into these transnational circumvention practices based on material from ethnographic fieldwork and interviews in Spain, Denmark, and the Czech Republic. In all three countries, gamete donation is made strictly anonymous. Clinical practices such as egg donor recruitment and phenotypical matching between donors and recipients serve to naturalize the substitution of gametes and to install social legitimacy through resemblance markers with the prospective child. In comparison to other areas of medical tourism, which are subjects of debate as a consequence of neoliberal health politics and international medical competition, mobility in the area of reproductive technologies is deeply intertwined with new forms of doing kinship. For prospective parents, it holds a promise of generating offspring who could pass as biogenetically conceived children. Therefore, IVF with gamete donation is mostly modeled after conceptions of nature. Through anonymity and concealment it creates forms of nonrelatedness that leave space for future imaginings and traces of transnational genetic creators.     

A Convolution Estimator for the Density of Nonlinear Regression Observations

Abstract. The problem of estimating an unknown density function has been widely studied. In this article, we present a convolution estimator for the density of the responses in a nonlinear heterogenous regression model. The rate of convergence for the mean square error of the convolution estimator is of order n ^?1 under certain regularity conditions. This is faster than the rate for the kernel density method. We derive explicit expressions for the asymptotic variance and the bias of the new estimator, and further a data‐driven bandwidth selector is proposed. We conduct simulation experiments to check the finite sample properties, and the convolution estimator performs substantially better than the kernel density estimator for well‐behaved noise densities.     

A Collaborative Approach to Infant Research: Promoting Reproducibility,Best Practices,and Theory‐Building

The ideal of scientific progress is that we accumulate measurements and integrate these into theory, but recent discussion of replicability issues has cast doubt on whether psychological research conforms to this model. Developmental research—especially with infant participants—also has discipline‐specific replicability challenges, including small samples and limited measurement methods. Inspired by collaborative replication efforts in cognitive and social psychology, we describe a proposal for assessing and promoting replicability in infancy research: large‐scale, multi‐laboratory replication efforts aiming for a more precise understanding of key developmental phenomena. The ManyBabies project, our instantiation of this proposal, will not only help us estimate how robust and replicable these phenomena are, but also gain new theoretical insights into how they vary across ages, linguistic communities, and measurement methods. This project has the potential for a variety of positive outcomes, including less‐biased estimates of theoretically important effects, estimates of variability that can be used for later study planning, and a series of best‐practices blueprints for future infancy research.     

Probing the Opposition to Affirmative Action

People's attitudes toward affirmative action are explored by means of a survey instrument that presents respondents with a scenario of a firm that has several hundred well-paying jobs that only require skills learned on the job. The instrument comes in two versions: one that explores people's reaction to a history of the complete exclusion of blacks, and the other to the complete exclusion of women. Respondents are given a menu of possible actions the firm might take, and asked which they favor. In addition they are asked to react to a number of statements that explore their thoughts as to the reasons for the exclusions, how fair the company's decision processes seem, and how much importance should be attached to remedying the situation. By an overwhelming margin, a group of mainly white college students refused to endorse the idea that the exclusion of blacks or women was explained by their inability or unwillingness to do the jobs in question. Respondents split about evenly on the desirability of taking special hiring actions to repair exclusions. Those rejecting such actions tended to reject also the idea that the country would be better off if occupational segregation by race and sex were eased.