Distributional Phonetic Learning at 10 Months of Age

Infant phonetic perception reorganizes in accordance with the native language by 10 months of age. One mechanism that may underlie this perceptual change is distributional learning, a statistical analysis of the distributional frequency of speech sounds. Previous distributional learning studies have tested infants of 6–8 months, an age at which native phonetic categories have not yet developed. Here, three experiments test infants of 10 months to help illuminate perceptual ability following perceptual reorganization. English‐learning infants did not change discrimination in response to nonnative speech sound distributions from either a voicing distinction (Experiment 1) or a place‐of‐articulation distinction (Experiment 2). In Experiment 3, familiarization to the place‐of‐articulation distinction was doubled to increase the amount of exposure, and in this case infants began discriminating the sounds. These results extend the processes of distributional learning to a new phonetic contrast, and reveal that at 10 months of age, distributional phonetic learning remains effective, but is more difficult than before perceptual reorganization.     

Incorporating physiology into parasitoid behavioral ecology: the allocation of nutritional resources

A critical problem faced by most theoretical studies of parasitoid behavior and population dynamics has been the paucity of empirically obtained information about the pattern of resource allocation to egg production and metabolic maintenance in relation to adult diet in female parasitoids. This review calls for a shift from traditional manipulative feeding studies to studies that quantify the energetic budget of parasitoids and which take into account the dynamic nature of metabolic processes. As guidelines, we highlight the advances made along these lines with other insect groups and some of the simplest tools already available today for fulfilling this goal. Received: December 22, 1998 / Accepted: January 12, 1999     

Coverage with k-transmitters in the presence of obstacles

For a fixed integer k≥0, a k-transmitter is an omnidirectional wireless transmitter with an infinite broadcast range that is able to penetrate up to k “walls”, represented as line segments in the plane. We develop lower and upper bounds for the number of k-transmitters that are necessary and sufficient to cover a given collection of line segments, polygonal chains and polygons.     

Neural Interaction Between Risk Sensitivity and Cognitive Control Predicting Health Risk Behaviors Among Late Adolescents

The developmental period of adolescence is characterized by increasing incidence of health risk behaviors (HRBs). Based on theoretical models that emphasize the moderating role of cognitive control, this study examined how neural correlates of cognitive control and risk sensitivity interact to predict HRBs among late adolescents (17–20 years). Neuroimaging data indicate that risk‐related hemodynamic activity in the anterior insula during anticipation of uncertain outcomes predicts HRBs among late adolescents exhibiting greater dorsal anterior cingulate cortex (dACC) activity during a cognitive interference task but not among late adolescents requiring less dACC activity. These results present neural evidence for a significant moderating effect of cognitive control on the link between risk sensitivity and HRBs among late adolescents.     

The education of children and adolescents in out-of-home care: a problem or an opportunity? Results of a longitudinal study

The education of children in care is an issue that often falls into a no man’s land in which responsibility always seems to be attributed to the other ‘department’. Furthermore, all too often, teachers, educators and foster parents find themselves working with these children with no support, as if they were isolated cases. The aim of this study is to get to know the school situation of children in different types of out-of-home care: residential, kinship and non-kinship care. Systematic data on the school situation of 11–16-year-olds (on class attendance, school behaviour, academic results and guidance towards post-compulsory education) were gathered over a period of 5 consecutive school years. A 3-year longitudinal study on the same items (N?=?391) was made and time-series data were gathered for 5 years (N?=?1841). Results show that the in-care population is at a clear disadvantage and inequality of opportunities compared to the general population in relation to their educational pathways and outcomes; the most disadvantaged being the population in residential care. Recommendations are included, posing the challenge that what has to date been considered a ‘problem’ should become an opportunity for these children.     

Testing the Personal Wellbeing Index on 12–16?Year-Old Adolescents in 3 Different Countries with 2 New Items

The 7-item adult version of the Personal Wellbeing scale (Cummins et al. Social Indic Res 64:159?C190, 2003) was administered to two samples of adolescents aged 12?C16 in Brazil (N?=?1,588) and Spain (N?=?2,900), and to a sample of adolescents aged 14?C16 in Chile (N?=?843). The results obtained were analyzed to determine its psychometric characteristics when used with adolescents in the three different countries and to check whether two additional items would improve its qualities. Results reveal that the new PWI-9 version worked well with the adolescents in the three countries, improving some of the qualities of the PWI-7. One of the added items, satisfaction with oneself, appears to be a major contributor to unique explained variance when regressed on the single-item of overall life satisfaction (OLS). The model we present using structural equations shows good fit statistics for the factor structure, with both 7 and 9 items. Separate in-country analyses demonstrate that cultural context has a strong influence on correlations and saturations between the studied variables and also on the explained variance. Probably related to this fact, the Model fit structure is good in Brazil (with a low PWI variance accounted for by its predictors) and Spain (medium), but rather modest in Chile, where data show a high proportion of the PWI variance accounted for by its predictors. However, a multi-group factor analysis among the three countries restricting saturations to 1 in each country in order to make data comparable across countries still show a good fit of the proposed model for both PWI-7 and PWI-9.     

Subjective well‐being: what do adolescents say?

The aim of this paper is to analyse how 10‐ to 15‐year‐old adolescents define their own perceptions of well‐being and the factors influencing it at their age. Ten focus groups were organized, two from each age group. One group for each age included the students with the lowest scores in subjective well‐being (SWB) and the other included those with the highest, according to their responses to previously administered psychometric scales. The views of the participating adolescents were explored by means of a content analysis. In general, the children mentioned both positive and negative elements of participating in defining what constitutes well‐being. According to these children, well‐being is related to both affects and attitudes, relations with family and friends being key factors in it. Differences in the information provided reveal some variations according to age and SWB score. Children scoring lower in SWB tend to refer more to relationships with friends and basic needs covered, whereas those scoring higher tend to refer more to family relationships and not having problems. The results of this research can contribute to both social policy design and appraisal as they provide an in‐depth understanding of how SWB works at these ages.     

SURPRISE ME IF YOU CAN: THE INFLUENCE OF NEWSPAPER ENDORSEMENTS IN U.S. PRESIDENTIAL ELECTIONS

We here evaluate the heterogeneous effects of newspaper endorsements of U.S. Presidential candidates in the 100 days preceding the 2008 and 2012 elections on the probability that they win the election. Our identification strategy relies on daily variations in the winning probabilities (obtained from the Intrade prediction market) and the fact that newspapers decide their endorsements weeks before their announcement. Endorsements that are classified as surprising and consistent have the largest effect. An endorsement is surprising when the newspaper has not traditionally endorsed the candidate's party. An endorsement is inconsistent when the newspaper leans ideologically to one party but endorses a candidate from another party. (JEL L82, D7)     

The Values Adolescents Aspire to,Their Well-being and the Values Parents Aspire to for Their Children

This paper presents a study of the relationship between the psychological well-being of Spanish adolescents from 12 to 16 years old and the values they aspire to for the future (N = 1,618). Adolescents’ well-being is explored through (a) their satisfaction with 19 specific life domains, (b) the Personal Well-Being Index (Cummins, Social Indicators Research, 43, 307−334, 1998) and (c) an item on overall satisfaction with life. The values they aspire to are explored by means of a list of 23 personal qualities or values. Satisfaction domains and values aspired to have been grouped into dimensions using principal component analysis (PCA). Boys scored significantly higher on the materialistic values dimension and the capacities and knowledge related values dimension, while girls scored higher on the interpersonal relationship related values dimension. The youngest adolescents scored higher on materialistic values, while the oldest scored higher on interpersonal relationships related values. Such results are similar to those obtained in a previous study, using a shorter version of the lists of satisfaction domains and of values aspired to and a sample of 8,995 adolescents and 4,381 of their parents from five different countries. In both studies results suggest that values aspired to can be considered a well-being related construct. However, an important change appears in the latest Spanish sample: Family values no longer fit with the interpersonal relationships related values dimension in the PCA, and now function as a separate value dimension which shows no correlation with overall life satisfaction, the PWI, or life satisfaction domains with the exception of family satisfaction. Interestingly, family values have also changed their loading dimension in the PCA developed with the answers from a sample of parents about the values they aspire to for their own child’s future (N = 723). Parents’ responses were compared with those of their own child, with concordances observed in about half of the families, low discrepancies in about one third and high or very high discrepancies in about 20%. Although the results of this study have their limitations, they suggest support for the hypothesis that important changes in values aspired to may be taking place over a short period of time, consistent with the findings of changes in values in several countries (Inglehart, Modernization and postmodernization. Cultural, economic and political change in 43 societies, Princeton: Princeton University Press, 1997), but apparently with no outstanding impact on adolescents’ well-being.