Structured regularization for conditional Gaussian graphical models

Conditional Gaussian graphical models are a reparametrization of the multivariate linear regression model which explicitly exhibits (i) the partial covariances between the predictors and the responses, and (ii) the partial covariances between the responses themselves. Such models are particularly suitable for interpretability since partial covariances describe direct relationships between variables. In this framework, we propose a regularization scheme to enhance the learning strategy of the model by driving the selection of the relevant input features by prior structural information. It comes with an efficient alternating optimization procedure which is guaranteed to converge to the global minimum. On top of showing competitive performance on artificial and real datasets, our method demonstrates capabilities for fine interpretation, as illustrated on three high-dimensional datasets from spectroscopy, genetics, and genomics.     

Developmental Change in Infants' Detection of Visual Faces that Match Auditory Vowels

Infants demonstrate robust audiovisual (AV) perception, detecting, for example, which visual face matches auditory speech in many paradigms. For simple phonetic segments, like vowels, previous work has assumed developmental stability in AV matching. This study shows dramatic differences in matching performance for different vowels across the first year of life: 3‐, 6‐, and 9‐month‐olds were familiarized for 40 sec with a visual face articulating a vowel in synchrony with auditory presentations of that vowel, but crucially, the mouth of the face was occluded. At test, infants were shown two still photos of the same face without occlusion for 1 min in silence. One face had a static articulatory configuration matching the previously heard vowel, while the other face had a static configuration matching a different vowel. Three auditory vowels were used: /a/, /i/, and /u/. Results suggest that AV matching performance varies according to age and to the familiarized vowel. Interestingly, results are not linked to the frequency of vowels in auditory input, but may instead be related to infants' ability to produce the target vowel. A speculative hypothesis is that vowel production in infancy modulates AV vowel matching.     

An integrated closed-loop product lifecycle management approach for reverse logistics design

Nowadays, reverse logistics is gaining importance for many companies in different industries. This importance is rooted in the fact that it generates profit and decreases the environmental impacts of products. Even though the decrease of environmental impacts is an indispensable requisite, reverse logistics design is only driven by cost indicators. The main reason behind this high cost is access to environmental information is difficult and is directly linked to data all along the lifecycle of the product. This paper presents a method by which reverse logistics design integrates environmental impacts based on the management of closed-loop product lifecycle. This method is divided into two processes: from beginning of life to end of life and from end of life to beginning of life. The first process integrates product data in order to calculate environmental impacts of the potential reverse logistics networks, whereas the second process selects the most appropriate reverse logistics network before optimising the product based on this particular network. The proposition is illustrated by a case study on a recycled aluminium automotive part.     

What fuels the fire: Job- or task-specific motivation (or both)? On the hierarchical and multidimensional nature of teacher motivation in relation to job burnout

Drawing on a hierarchical (job and task level) and multidimensional conceptualisation of work motivation (intrinsic, identified, introjected, and external regulations), this study examines relationships between motivational regulations and burnout. Participants were 806 French-Canadian teachers working in public elementary and high schools. Results reveal different associations between burnout and the regulations that drive teachers to engage in their overall job or in specific tasks: autonomous regulations (intrinsic and identified) are negatively associated with burnout but more negatively at the job than task level, whereas controlled regulations (introjected and external) are positively associated with burnout but more positively at the task than job level. This study provides valuable insights into how teachers’ motivations towards both the job and tasks can foster or prevent burnout symptoms. Implications for theory and research on burnout and work motivation are discussed.     

Unionization and Labour‐market Discrimination: A Closer Look at Non‐unionized Workers

This paper introduces a model that examines the effects of unions on pay and hiring gaps between non‐unionized men and women in the context of imperfect competition. Although the model does not question the advantages unions obtain for their members, it does show that (1) unions increase wage and occupational discrimination for non‐unionized workers; (2) the non‐unionized sector does not constitute a good comparison group for use in analysing the impact of unions on gender discrimination; and (3) public policies targeting gender differences in occupational sorting can also have a positive impact on gender wage differentials.     

Books received as of April 30, 1985

This research focuses on insiders’ views of marital sex and their dyadic patterning. The analyses were conducted based on seventy‐two (72) couples’ assessments of their recent sexual interactions. Non‐genital and genital activities were assessed as a function of the respondents’ and the actors’ gender, and as a function of constructs that were specific to the marital partners as individuals and as a marital dyad. Consistent differences were found between husbands’ and wives’ perceptions of discrepancies within their couple. Regardless of respondents’ gender, couples reported that wives were genitally less active than husbands and that this was in accordance with the wives’ preferences. The results are discussed with respect to the advantages of using a dyadic methodology for measuring dimensions of sex which involve interpersonal behaviors.     

Different ways of knowing a child and their relations to mother‐reported autonomy support

We considered how different forms of child knowledge (i.e., mothers’ reports of taking their child's perspective, their accurate knowledge in the form of precise predictions of their child's ratings regarding distress/comforting and compliance/discipline situations, and their perceived knowledge) are differentially associated with mother‐reported autonomy support (i.e., providing meaningful rationales, providing choice, and acknowledging feelings; Koestner, Ryan, Bernieri, & Holt, 1984 ). Mothers and their children (141 dyads, M = 11 years old at Time 1) participated in a two‐wave longitudinal study with assessments made two years apart. The only form of knowledge that predicted changes in autonomy support was perspective‐taking. Autonomy support, in turn, indirectly predicted changes in distress/comforting accuracy through child‐reported self‐disclosure and directly predicted changes in perceived knowledge. These findings underline the importance of differentiating among forms of child knowledge in the study of socialization processes.