Long Lasting Marriages in Chile

Reports the Chilean segment of a multicultural, multicountry (Canada, Germany, Israel, Netherlands, South Africa, Sweden, USA) study on long-term marriages. This pilot study is seen as a starting point in research focusing on the childhood background and family history of long-term marital partners in Chile. No statistically significant association between marital satisfaction and economic or educational level was found. A positive correlation was found between marital satisfaction and happiness during childhood. Love, trust, and loyalty appear to be the main ingredients of satisfaction for both satisfied and unsatisfied couples. The findings across countries as to the essential ingredients reported here have been remarkably similar.     

A software tool for auditory and speech perception experimentation

A computer program capable of supporting auditory and speech perception experimentation is described. Given a continuum of acoustic stimuli, the program (Paradigm) allows the user to present those stimuli under different, well-known psychophysical paradigms (simple identification, identification with a rating scale, 2IAX, ABX, AXB, and oddity task). For discrimination tests, both high uncertainty (roving designs) and minimal psychophysical uncertainty (fixed designs) procedures are available. All the relevant time intervals can be precisely specified, and feedback is also available. Response times can be measured as well. Furthermore, the program stores subjects’ responses and provides summaries of experimental results for both individual subjects and groups. The program runs on Microsoft Windows (3.1 or 95) on personal computers equipped with any soundboard.     

Context effects in visual pattern recognition by pigeons

In the experiments described in this paper we examined the effects of contextual stimuli on pigeons’ recognition of visual patterns. Experiment z showed acontext-superiority effect. Specifically, two target forms that were identical except for location in the visual field were not discriminated when presented alone, but the compounds formed when each of these targets was placed between a nearby pair of flanking stimuli were readily discriminated. The size of the context-superiority effect decreased with increasing target-flanker separation. In Experiments 2 and 3 the two targets differed in form rather than spatial location and were readily discriminated in the absence of Hankers. Under these circumstances, adding an identical pair of flankers to each target resulted in a content-inferiority effect; that is, the two target-plus-Hankers compounds were less readily discriminated than the targets atone. The size of the context-inferiority effect decreased with increasing target-flanker separation. The observed effects of context are predictable from the Heinemann-Chase (1990) model of pattern recognition.     

On Jaśkowski's discussive logics

We expose the main ideas, concepts and results about Jakowski's discussive logic, and apply that logic to the concept of pragmatic truth and to the Dalla Chiara-di Francia view of the foundations of physics.Partially supported by grants from JNICT (Portugal) and FAPESP (Brazil), Philosophy Section. Portions of this paper were concluded while the second author visited the Math-Phys Seminar at the University of Algarve (Portugal).Presented byCecylia Rauszer     

R&D system in the petrochemical industry in Brazil: Institutional challenge under privatization

Brazil has achieved a tremendous, short-term growth in its petrochemical sector. In 1989 it placed eleventh in the world ranking of petrochemical producers. The main factor responsible for this success was the establishment of three integrated petrochemical complexes in which the government stimulated joint-ventures between a state enterprise, national private and foreign corporations: the so-called “tripartite model.” In this model, foreign partners should provide the necessary technology, state enterprise financial capital and access to raw materials, and the national private bouregoisie legitimacy to the state, as well as, access to the Brazilian market. The tripartite model promoted the creation of several small, single-product petrochemical firms without entrepreneurial scale to carry out efficient R&;D activities. The result is that the Brazilian petrochemical sector is at risk of becoming technologically static and, consequently, uncompetitive; hampering further national capital accumulation. The R&;D system, originally designed to complement the inventive activities of firms, was based on government research centers. In 1988, a new institutional design was proposed, based on a research center managed by the state holding company PETROQUISA. The conception changed from state intervention toward shared responsability by stockholders. This institutional change opens two basic questions: Given that the locus of innovation in this industry has been historically located in the firm, can any other institutional arrangement substitute it?; and, will it be possible, given the government privatization program, to develop a R&;D system on the assumption that stockholders are willing to share the cost of R&;D activities? This article addresses these two questions.     

Balancing fit and parsimony to improve Q-matrix validation

The Q-matrix identifies the subset of attributes measured by each item in the cognitive diagnosis modelling framework. Usually constructed by domain experts, the Q-matrix might contain some misspecifications, disrupting classification accuracy. Empirical Q-matrix validation methods such as the general discrimination index (GDI) and Wald have shown promising results in addressing this problem. However, a cut-off point is used in both methods, which might be suboptimal. To address this limitation, the Hull method is proposed and evaluated in the present study. This method aims to find the optimal balance between fit and parsimony, and it is flexible enough to be used either with a measure of item discrimination (the proportion of variance accounted for, PVAF) or a coefficient of determination (pseudo-R²). Results from a simulation study showed that the Hull method consistently showed the best performance and shortest computation time, especially when used with the PVAF. The Wald method also performed very well overall, while the GDI method obtained poor results when the number of attributes was high. The absence of a cut-off point provides greater flexibility to the Hull method, and it places it as a comprehensive solution to the Q-matrix specification problem in applied settings. This proposal is illustrated using real data.     

Life satisfaction in divorced or separated people: a comparison between Spain and Chile / La satisfacción vital en personas divorciadas o separadas: una comparación entre España y Chile

This paper analyses life satisfaction after divorce, comparing Chilean and Spanish divorced or separated people. There were 468 divorced people included in the study, 240 Spanish and 228 Chilean. 71.5% of the Chilean and 100% of the Spanish people had children. An analysis of the variance identified that life satisfaction is higher in Chilean people than in Spanish people, although the size of the effect is moderate. Regression analysis of the data sets shows that the time since divorce and provenance explain life satisfaction for those divorced people who participated in this study. Separate analyses by country show that while for divorced Spanish people time since their divorce was the only predictor of life satisfaction, age and time since separation were the predictors of life satisfaction for Chilean divorced people.     

Object permanence and method of disappearance: looking measures further contradict reaching measures

Piaget proposed that understanding permanency, understanding occlusion events, and forming mental representations were synonymous; however, accumulating evidence indicates that those concepts are not unified in development. Infants reach for endarkened objects at younger ages than for occluded objects, and infants’ looking patterns suggest that they expect occluded objects to reappear at younger ages than they reach for them. We reaffirm the latter finding in 5‐ to 6‐month‐olds and find similar responses to faded objects, but we fail to find that pattern in response to endarkened objects. This suggests that looking behavior and reaching behavior are both sensitive to method of disappearance, but with opposite effects. Current cognition‐oriented (i.e. representation‐oriented) explanations of looking behavior cannot easily accommodate these results; neither can perceptual‐preference explanations, nor the traditional ecological reinterpretations of object permanence. A revised ecological hypothesis, invoking affordance learning, suggests how these differences could arise developmentally.     

Job Insecurity and Well-Being: Moderation by Employability

The present study investigates the relationship between job insecurity and well-being (psychological distress and life satisfaction), and the potential role of employability in this relationship. With regard to job insecurity, we hypothesize that job insecurity may be related to poor well-being. Regarding employability, two avenues are taken. First, we argue that employability may be beneficial in much the same way that job security is. Second, we suggest that employability may mitigate likely unfavourable consequences of job insecurity for employees’ well-being. Hypotheses are tested with a sample of 639 Belgian employees from six organizations. The results suggest that job insecurity is related to poor well-being, while no such association is found for employability. Furthermore, employability moderates the relationship between job insecurity and life satisfaction, as expected. Specifically, the model accounts for 8% of the explained variance. However, this pattern of results is not replicated for psychological distress.