On Gentzen Relations Associated with Finite-valued Logics Preserving Degrees of Truth

When considering m-sequents, it is always possible to obtain an m-sequent calculus VL for every m-valued logic (defined from an arbitrary finite algebra L of cardinality m) following for instance the works of the Vienna Group for Multiple-valued Logics. The Gentzen relations associated with the calculi VL are always finitely equivalential but might not be algebraizable. In this paper we associate an algebraizable 2-Gentzen relation with every sequent calculus VL in a uniform way, provided the original algebra L has a reduct that is a distributive lattice or a pseudocomplemented distributive lattice. We also show that the sentential logic naturally associated with the provable sequents of this algebraizable Gentzen relation is the logic that preserves degrees of truth with respect to the original algebra (in contrast with the more common logic that merely preserves truth). Finally, for some particular logics we obtain 2-sequent calculi that axiomatize the algebraizable Gentzen relations obtained so far.     

How Do Propensity Score Methods Measure Up in the Presence of Measurement Error? A Monte Carlo Study

Considering that the absence of measurement error in research is a rare phenomenon and its effects can be dramatic, we examine the impact of measurement error on propensity score (PS) analysis used to minimize selection bias in behavioral and social observational studies. A Monte Carlo study was conducted to explore the effects of measurement error on the treatment effect and balance estimates in PS analysis across seven different PS conditioning methods. In general, the results indicate that even low levels of measurement error in the covariates lead to substantial bias in estimates of treatment effects and concomitant reduction in confidence interval coverage across all methods of conditioning on the PS.     

La evaluación de la escritura

Resumen

En este estudio se realiza una revisión de los sistemas de evaluación de la escritura y de estudios relacionados. Se comienza con una visión de conjunto de las dificultades principales en el estudio de la evaluación de la escritura, y de la importancia y utilidad que tiene un sistema de evaluación de la escritura en distintas áreas de conocimiento. Posteriormente se analiza cuál es el objeto de evaluación de los diferentes sistemas y qué medidas se utilizan en las investigaciones acerca de la escritura. A este respecto se expone un modelo del producto de la escritura que permite organizar, de modo prácticamente exhaustivo, las medidas del producto escrito. Tras resumir los requisitos, que según distintos autores debería cumplir cualquier sistema de evaluación de la escritura, se clasifican los sistemas de evaluación en base a si el objeto de análisis es el proceso o el producto de la escritura, definiendo sus características generales. A su vez, se exponen diferentes clasificaciones de los sistemas de evaluación del producto escrito, realizadas principalmente en función de la estrategia de evaluación. Esta revisión muestra la falta de acuerdo existente entre los diferentes autores respecto al objeto y el modo de evalución, así como a la terminología utilizada.     

Behavioral Problems and Reading Difficulties Among Language Minority and Monolingual Urban Elementary School Students

This study examined the potentially compounding effect of language minority (LM) status on problem behaviors among urban second and third grade-level poor readers. Univariate analyses showed that a disproportionate percentage of both LM and English monolingual (L1) poor readers already displayed clinically significant levels of anxiety, social problems, and oppositional behaviors in the classroom. Analyses of variance, however, demonstrated that LM status was not an additive risk factor for reading difficulties, behavior problems, or lowered self-concept in this sample. No differences were observed between LM and L1 students on a wide range of reading measures, on their teachers’ ratings of internalizing and externalizing problem behaviors in the classroom, or on self-ratings of self-efficacy and social competence. Implications for intervention for all urban students with reading difficulties are discussed.     

BETWEEN RECEPTION AND SELF-PERCEPTION: TESTIMONIES OF HOLOCAUST SURVIVORS IN ISRAEL

Based on survivors’ testimonies the article discusses the encounters of Holocaust survivors in Palestine/Israel between 1945 and 1955. After addressing the issues of the historiography of these Holocaust survivors and the value of using their testimonies, it examines the interactions of survivors with official authorities: work, housing, kibbutzim, education, and the pre-military/IDF. It sheds light on the meaning of silence and the manifestation of stereotyping for the survivors themselves, and it assesses the impact of families and creating families. The article also examines the validity of these testimonies by studying some testimonies of Holocaust survivors who emigrated from Israel and those who immigrated directly from Europe to North America. The study concludes that although contemporary collective views influenced survivors’ perceptions, cases of their ill-treatment were not isolated. They were more the result of the attitudes of individuals than the policy of the state. Veteran Israelis' insensitivity affected survivors. Stigmatizing ostracized them. Lack of empathy and discrimination caused survivors to feel unwanted and lonely, which resulted in many volunteering for the military, or in self-isolation, or in getting married as quickly as possible. Lack of study and job opportunities for women were more difficult to overcome.     

Conditional Discriminations by Preverbal Children in an Identity Matching-to-Sample Task

This study sought to develop methodology for assessing whether children aged 16-21 months could learn to match stimuli on the basis of physical identity in conditional discrimination procedures of the type routinely used in stimulus equivalence research with older participants. The study was conducted in a private room at a daycare center for children and toddlers. The child and the research sat together on the floor facing an apparatus with two windows. Stimuli to be discriminated were toys especially designed to attract the child's attention and maintain continued interest. On simple discrimination and discrimination reversal trials that were programmed in initial training, S+ and S- toys were displayed within the two windows. When the child touched the window containing the toy defined as S+ on a given trial, s/he was allowed to manipulate/play with that toy. Selections of the S- toy ended the trial without a play opportunity. On subsequent identity matching-to-sample trials, the child was first allowed to manipulate a sample toy. Then, S+ (matching) and S- (nonmatching) comparison toys were displayed within the windows, and the selection consequences were the same as on simple discrimination trials. The study provides evidence that preverbal children can master simple and conditional discrimination performances via such procedures, perhaps setting the stage for subsequent studies aimed at establishing procedural control of the discrimination baselines needed to assess the stimulus equivalence potential of children in this age range.     

Social skills in women with Turner Syndrome

The aim of this study was to evaluate the performance of a group of women with Turner Syndrome (TS) in interpersonal situations where several social skills were required, and to compare the results with unaffected sisters. Fifty-two TS females aged 15-35 years and 33 sisters aged 16-43 were evaluated using Del-Prette Social Skills Inventory (SSI) and individual interviews. Thirty mothers to subjects and sisters answered questionnaires. It was found that TS girls' performance in SSI was as good as their sisters' and even better in meeting new people and facing unknown situations (p = 0.020). Older TS women scored better than younger ones, differently from their sisters. There were no significant correlations between total score of TS women and their age at diagnosis, time of follow-up and height z-score. Mothers reported having more problems with TS girls than with sisters. Although TS girls demonstrated having social difficulties, just a few of them spontaneously complained about interpersonal problems in the interview. Results suggest that social difficulties may not cause TS girls major problems nor make them unhappy with their social lives, and/or TS girls may not be able to perceive their own difficulties. Good performance in SSI also suggests that TS girls can identify adequate skills in presented situations and answer in a way to obtain good scores, but they may not necessarily use their skills due to other factors like anxiety and shyness. They may also have a tendency to answer SSI in a way they consider socially desirable, masking their real difficulties.     

The evolution of intergroup bias: perceptions and attitudes in rhesus macaques

Social psychologists have learned a great deal about the nature of intergroup conflict and the attitudinal and cognitive processes that enable it. Less is known about where these processes come from in the first place. In particular, do our strategies for dealing with other groups emerge in the absence of human-specific experiences? One profitable way to answer this question has involved administering tests that are conceptual equivalents of those used with adult humans in other species, thereby exploring the continuity or discontinuity of psychological processes. We examined intergroup preferences in a nonhuman species, the rhesus macaque (Macaca mulatta). We found the first evidence that a nonhuman species automatically distinguishes the faces of members of its own social group from those in other groups and displays greater vigilance toward outgroup members (Experiments 1-3). In addition, we observed that macaques spontaneously associate novel objects with specific social groups and display greater vigilance to objects associated with outgroup members (Experiments 4-5). Finally, we developed a looking time procedure-the Looking Time Implicit Association Test, which resembles the Implicit Association Test (Greenwald & Banaji, 1995)-and we discovered that macaques, like humans, automatically evaluate ingroup members positively and outgroup members negatively (Experiments 6-7). These field studies represent the first controlled experiments to examine the presence of intergroup attitudes in a nonhuman species. As such, these studies suggest that the architecture of the mind that enables the formation of these biases may be rooted in phylogenetically ancient mechanisms.     

Emotional time distortions: the fundamental role of arousal

An emotion-based lengthening effect on the perception of durations of emotional pictures has been assumed to result from an arousal-based mechanism, involving the activation of an internal clock system. The aim of this study was to systematically examine the arousal effect on time perception when different discrete emotions were considered. The participants were asked to verbally estimate the duration of emotional pictures from the International Affective Picture System (IAPS). The pictures varied either in arousal level, i.e., high/low-arousal, for the same discrete emotion (disgust or sadness) or in the depicted emotion, e.g., disgust/fear for pictures matched for arousal (high-arousal). The results systematically revealed a lengthening effect on the perception of the duration of the emotional compared to the neutral pictures and indicated that the magnitude of this effect increased with arousal level. Nevertheless, variations in time perception were observed for one and the same arousal level, with the duration of disgust-inducing pictures (e.g., body mutilation) being judged longer than that of fear-inducing pictures (e.g., snake). These results suggest that arousal is a fundamental mechanism mediating the effect of emotion on time perception. However, the effect cannot be reduced to arousal, since the impact of the content of pictures also plays a critical role.