Social‐developmental factors affecting lesbian and gay youth: a review of cross‐national research findings

Lesbian and gay youth face a great many challenges as they grow up. In this article, research focusing upon the social‐developmental factors that affect the positive development of a lesbian or gay identity are reviewed, comparing and contrasting data from the United States (US) and United Kingdom (UK). Consideration is also given to the efficacy of behaviours utilised by young lesbians and gay men to avoid harassment and discrimination. It is suggested that lesbian and gay youth represent a particularly vulnerable group of young people who engage in a number of health risk behaviours that are associated not only with sexual orientation, but also fears for personal safety. Finally the authors discuss whether or not strategies to conceal sexual orientation hold benefits for lesbian and gay youth in terms of their physical safety and mental health. Copyright © 2003 John Wiley & Sons, Ltd.     

Anonymity, ordinal preference proximity and imposed social choices

Extending on an impossibility result by Baigent [1], it is shown that an anonymous social choice procedure which preserves preference proximity cannot satisfy the weakest possible form of non-imposition. Received: 20 September 1999/Accepted: 11 May 2001     

Mechanisms Underlying Language Acquisition: Benefits From a Comparative Approach

One of the longstanding issues in language research has been the extent to which the mechanisms underlying language acquisition are uniquely human. The primary goal of this article is to introduce the reader to some of the recent developments in comparative language research that have shed new light on this issue. To appreciate the significance of the new developments, we begin with a brief historical overview of language studies that have adopted a comparative approach, and then discuss a subset of the relevant theoretical accounts that seek to explain why humans are the only species capable of acquiring language. We next focus on findings from behavioral studies comparing the performance of human infants and adults with nonhuman primates on tests that tap the perceptual and learning mechanisms that are fundamental to language acquisition. We argue that in cases where the behavioral data appear similar across populations, there is a need to investigate the underlying computational abilities and units of analysis to correctly specify the degree to which the mechanisms are truly shared or are uniquely specified.     

The AIDS Epidemic and Migrants in South Asia and South-East Asia

Migrant vulnerability to AIDS is an important public health care issue. After having listed some characteristics of the epidemic in Asia and their link with migration, the article describes some of the disease's consequences on economic sectors that employ migrants and lists preventive measures (regulatory, sectoral, microeconomic) that have been taken to counter the spread.     

Design of Developmental Toxicity Studies for Assessing Joint Effects of Dose and Duration

In the assessment of developmental and reproductive effects, the timing and duration of exposures to chemical compounds or other environmental contaminants are of particular interest, as the gestational cycle is known to have periods of increased sensitivity. The goal of this research is to identify optimal experimental designs for conducting developmental toxicity studies when the effects of both exposure level and duration of exposure are of interest. The elements of the study design considered in this evaluation are the allocation of animals to dose-duration exposure groups and the determination of the most efficient intermediate exposure levels. The optimality of various designs is assessed via the accuracy of the estimated excess risk as well as testing criteria. Simulation studies are conducted to compare these criteria and determine optimal design strategies under various underlying dose-response patterns. Asymptotic results are also derived to lend support to the simulation studies.     

A Behavioral Examination of Mead's View of Role-Taking

According to Mead, self appears as individuals take the role of others toward their own gestures. In two investigations, the hand movements of subjects were observed as they verbalized different commands specifying hand or head movement to another person. The first investigation explored the possibility of directly observing and recording instances of role-taking. In the second, the visual accessibility between experimental subjects was varied in order to assess its effect on the frequency of overt role-taking. Results indicate that the process of role-taking is amenable to direct observation; and, furthermore, that overt role-taking decreases as visual accessibility increases.