Models, assumptions and model checking in ecological regressions

Ecological regression is based on assumptions that are untestable from aggregate data. However, these assumptions seem more questionable in some applications than in others. There has been some research on implicit models of individual data underlying aggregate ecological regression modelling. We discuss ways in which these implicit models can be checked from aggregate data. We also explore the differences in applications of ecological regressions in two examples: estimating the effect of radon on lung cancer in the United States and estimating voting patterns for different ethnic groups in New York City.     

Intersensory Redundancy and 7‐Month‐Old Infants' Memory for Arbitrary Syllable‐Object Relations

Seven‐month‐old infants require redundant information, such as temporal synchrony, to learn arbitrary syllable‐object relations (Gogate & Bahrick, 1998). Infants learned the relations between 2 spoken syllables, /a/ and /i/, and 2 moving objects only when temporal synchrony was present during habituation. This article presents 2 experiments to address infants' memory for these relations. In Experiment 1, infants remembered the syllable‐object relations after 10 min, only when temporal synchrony between the vocalizations and moving objects was provided during learning. In Experiment 2, 7‐month‐olds were habituated to the same syllable‐object pairs in the presence of temporal synchrony and tested for memory after 4 days. Once again, infants learned and showed emerging memory for the syllable‐object relations 4 days after original learning under the temporally synchronous condition. These findings are consistent with the view that prior to symbolic development, infants learn and remember word‐object relations by perceiving redundant information in the vocal and gestural communication of adults.     

The Critical Role of Temporal Synchrony in the Salience of Intersensory Redundancy During Prenatal Development

We explored the amount and timing of temporal synchrony necessary to facilitate prenatal perceptual learning using an animal model, the bobwhite quail. Quail embryos were exposed to various audiovisual combinations of a bobwhite maternal call paired with patterned light during the late stages of prenatal development and were tested postnatally for evidence of prenatal auditory learning of the familiarized call. Results revealed that a maternal call paired with a single pulse of light synchronized with one note of the five note call was sufficient to facilitate embryos’ prenatal perceptual learning of the entire call. A synchronous note occurring at the onset of the call burst was most effective at facilitating learning. These findings highlight quail embryos’ remarkable sensitivity to temporal synchrony and indicate its role in promoting learning of redundantly specified stimulus properties during prenatal development.     

Overcoming liability concerns in vaccine trials involving pregnant women

Without the protection of vaccines, the health of pregnant women may be compromised. But assessing the safety and efficacy of vaccines in pregnancy requires research in pregnancy. Furthermore, vaccinating women while they are pregnant may convey immunity to the fetus in utero, but assessing this possible benefit of maternal immunization also requires research. This article argues that one factor inhibiting vaccine research involving pregnant women is that vaccine manufacturers fear incurring liability if they fund such research. We argue that vaccine research in pregnancy can be ethical, and we explore some methods for overcoming vaccine manufacturers' fear of liability.     

Theorizing Sexuality, Sexual Abuse and Residential Children's Homes: Adding Gender to the Equation

This article is primarily concerned with emphasizing the importanceof gender in relation to understanding and responding to sexualityand sexual abuse/exploitation issues within residential children’shomes. Initially, past research and inquiry reports are analysedand evaluated, not only in relation to their overall conclusionsand recommendations, but also with regard to their consideration,misrepresentation or omission of gender issues. A theoreticalframework is then drawn up which takes into account historicaldebates and contestations around notions of gender. This illustrateshow gender is frequently conflated or merged with understandingsabout sex and sexuality. This theoretical conceptualizationis then extended to consider the effects of the social constructionof childhood and childhood sexuality, and how sex, gender andsexuality may commonly be represented and understood withinorganizational, public-sphere contexts. Important findings froma recent indepth qualitative research project focused on sexualityissues in children’s homes are then presented thematicallyand through narrative excerpts. These findings are also locatedwithin and made comprehensible in relation to the theoreticalframework previously constructed. The conclusion examines theimplications of the findings presented and their theorization,and briefly evaluates the usefulness of recent policy initiativesintended to improve the care and development of ‘lookedafter’ children.     

Intrasensory Redundancy Facilitates Infant Detection of Tempo: Extending Predictions of the Intersensory Redundancy Hypothesis

Research has demonstrated that intersensory redundancy (stimulation synchronized across multiple senses) is highly salient and facilitates processing of amodal properties in multimodal events, bootstrapping early perceptual development. The present study is the first to extend this central principle of the intersensory redundancy hypothesis (IRH) to certain types of intrasensory redundancy (stimulation synchronized within a single sense). Infants were habituated to videos of a toy hammer tapping silently (unimodal control), depicting intersensory redundancy (synchronized with a soundtrack) or intrasensory redundancy (synchronized with another visual event; light flashing or bat tapping). In Experiment 1, 2‐month‐olds showed both intersensory and intrasensory facilitation (with respect to the unimodal control) for detecting a change in tempo. However, intrasensory facilitation was found when the hammer was synchronized with the light flashing (different motion) but not with the bat tapping (same motion). Experiment 2 tested 3‐month‐olds using a somewhat easier tempo contrast. Results supported a similarity hypothesis: intrasensory redundancy between two dissimilar events was more effective than that between two similar events for promoting processing of amodal properties. These findings extend the IRH and indicate that in addition to intersensory redundancy, intrasensory redundancy between two synchronized dissimilar visual events is also effective in promoting perceptual processing of amodal event properties.     

Media Representations of Islam in Britain: A Sojourner Perspective

This paper presents findings from a qualitative study in Britain on international Muslim students’ perceptions of media portrayals of Islam. Eighteen international students were interviewed; they came from a range of countries so that a diversity of opinion could be gathered. The paper reveals that participants perceived the representation of Islam in the British media to be negative, being associated with conservatism, economic backwardness and terrorism. Participants criticised the media’s tendency towards the homogenisation of Muslims and of Muslim communities and countries. They also called on media organisations to balance the negative portrait of Islam with positive news stories and to be more responsible in their reporting of terrorism. Interestingly, it could be observed that their direct consumption of UK media was limited, pointing to the possibility that their views were either “discursively” driven or were the product of “passive media consumption”.