The age-varying effects of adolescent stress on impulsivity and sensation seeking

Adolescence is defined in part by heightened exposure and sensitivity to stressors. In a longitudinal cohort of youth at risk for substance use problems, we examined the age-varying relationship between stress exposure and traits that are central to the dual systems model. The positive associations between stress exposure, impulsivity, sensation seeking varied as function of age. Specifically, the influence of stress exposure on impulsivity strengthened during early adolescence and remained stable into early adulthood, while the influence of stress exposure on sensation seeking strengthened from early- to mid-adolescence and weakened thereafter. These findings suggest that the maturational imbalance between the capacity to regulate impulsive tendencies and sensation seeking may be exaggerated for youth who are exposed to a high number of stressors.     

The Low Income Gap: A New Indicator Based on a Minimum Income Standard

Social Indicators Research - A method to measure vulnerability to multidimensional poverty is proposed under a mean–risk behaviour approach. We extend the unidimensional downside...     

How Prevalent Are Stable-Paretian Distributed Financial Variables?

Many studies have claimed that the stable-Paretian distribution should be used to model a wide variety of financial variables, ranging from stock and futures prices to exchange rates. Using a newly developed method, this study shows that the stable distribution is unsuitable for modeling most financial variables that are stable-distributed. We found that the distributions of a few accounting ratios may be stable. Our conclusions support a change in the future directions of financial-variable modeling.     

Competition for Infants' Attention: The Interactive Influence of Attentional State and Stimulus Characteristics

The interactive effects of stimulus characteristics and attentional state on infants' distraction latency were studied. As 7‐month‐old infants explored initial stimuli that were composed of either a single nonmoving component or multiple moving components, one of several types of distractors was presented in the periphery. Infants' distraction latencies (the amount of time they took to turn from the initial stimulus to the distractor) varied as a function of the interaction between the infants' attentional state at distractor onset and the characteristics of the stimuli. Variations in the visual characteristics of the distractor stimulus (solid rectangle vs. checkerboard) had a larger effect on distraction latency when infants were in a focused attentional state than when they were in a casual attentional state. Similarly, variations in the auditory characteristic of the distractor stimulus (1 intermittent tone vs. 2 alternating tones) had a larger effect when infants were engaged in a focused attentional state toward the multicomponent toys. Thus, infants' distractibility in this context reflects an interaction between the infants' attentional state and the competition between external stimuli for their attentional focus.     

Wavelet shrinkage for unequally spaced data

Wavelet shrinkage (WaveShrink) is a relatively new technique for nonparametric function estimation that has been shown to have asymptotic near-optimality properties over a wide class of functions. As originally formulated by Donoho and Johnstone, WaveShrink assumes equally spaced data. Because so many statistical applications (e.g., scatterplot smoothing) naturally involve unequally spaced data, we investigate in this paper how WaveShrink can be adapted to handle such data. Focusing on the Haar wavelet, we propose four approaches that extend the Haar wavelet transform to the unequally spaced case. Each approach is formulated in terms of continuous wavelet basis functions applied to a piecewise constant interpolation of the observed data, and each approach leads to wavelet coefficients that can be computed via a matrix transform of the original data. For each approach, we propose a practical way of adapting WaveShrink. We compare the four approaches in a Monte Carlo study and find them to be quite comparable in performance. The computationally simplest approach (isometric wavelets) has an appealing justification in terms of a weighted mean square error criterion and readily generalizes to wavelets of higher order than the Haar.     

Families on Television: A Content Analysis

An analysis of television programs telecast during peak viewing hours in Melbourne over one week uncovered the pattern of representation of family life. This version of family life was then compared with official statistics of the Australian population and families to highlight the discrepancies between reality and the mediated world of television. Several clear trends were observed. Programs were male-dominated, middle-aged biased, white Anglo-Saxon and largely middle-class oriented. Considerable discrepancy was apparent between family structures in the real world and the media world of family types. Further, analysis of marital relationships, sexual division of labour, ageing, and an evaluation of values reinforces a traditional conservative aura. It is considered that the dominant program formulae fail to recognise new social realities, and that orthodox family stereotypes could be affecting decisions made by policy makers.     

Sociology and the Nation-State in an Era of Shifting Boundaries

Academic disciplines and nation-states resemble one another in the sense that both emerged worldwide as overarching categories for conferring collective identities about a century ago. During the past quarter century, however, the status of both has been challenged. Disciplines like sociology have been challenged by more salient intellectual boundaries organized around subdisciplinary, transdisciplinary, and supradisciplinary lines—a fact that helps account for sociology's response to external threats to the discipline with a sense of being in crisis. Nation-states have been similarly challenged by new jurisdictions organized around subnational, transnational, and supranational lines. Even so, these changes constitute a process of differentiation, not displacement; disciplines and nation-states are likely to persist in serving important functions. albeit reduced in scope.