A Bayesian-Network Approach to Lexical Disambiguation

Lexical ambiguity can be syntactic if it involves more than one grammatical category for a single word, or semantic if more than one meaning can be associated with a word. In this article we discuss the application of a Bayesian-network model in the resolution of lexical ambiguities of both types. The network we propose comprises a parsing subnetwork, which can be constructed automatically for any context-free grammar, and a subnetwork for semantic analysis, which, in the spirit of Fillmore's (1968) case grammars, seeks to fulfill the required cases of all candidates for verb of the sentence. Solving for the highest joint probability of the variables conditioned upon the evidences to the network yields the most likely candidate with its meaning, along with its cases and respective meanings. This is achieved by fixing the values of all evidence nodes concurrently, and then performing a stochastic simulation in which the remaining nodes are updated probabilistically with a high degree of parallelism. The process of disambiguation is directed neither by the syntax nor the semantics, but rather by the interrelation between the two subnetworks. The use of a Bayesian-network model allows us to express this interrelation between the two subnetworks and among their constituents in a rather direct and rigorous way that, in connection with the convergence properties of the stochastic simulation, reveals a very robust model.     

Timing of Early Maternal Mental Health and Child Cortisol Regulation

Maternal mental health problems can negatively impact children's physiological stress regulation. Yet, little is known of their long‐term effects, especially related to the timing of maternal symptoms. We examined how maternal mental health problems during pregnancy versus in the early postpartum period predict children's cortisol levels and diurnal patterns at 10–12 years. Participants were a selection (N = 102) of an original sample of 805 Finnish families, who were followed from the second trimester of pregnancy (T1) to child's age of 2 months (T2) and 12 months (T3), and again at child's age of 10–12 years (T4). Based on the timing of psychological distress and depressive symptoms (T1–T3), the mothers could be assigned to three distinct mental health trajectory groups: mothers with prenatal mental health problems (n = 15), mothers with early postpartum mental health problems (n = 15) and mothers without mental health problems (n = 72). Children's cortisol (T4) was measured by saliva samples through five within‐1‐day assessments. The results show that maternal prenatal mental health problems predicted a relatively steep increase of child cortisol from awakening to 1 h later, indicating an intensified cortisol awakening response (CAR). Mothers' early postpartum mental health problems instead predicted a reduced CAR. Both maternal prenatal and postnatal mental health problems thus predicted children's later stress regulation, but in unique ways. We discuss the specific roles of direct biochemical effects during pregnancy and postpartum mother–infant interaction quality as modifiers of the hypothalamic–pituitary–adrenal system. Copyright © 2015 John Wiley & Sons, Ltd.     

Gender Differences in Parental Images and Intimate Relationships: A Northern Finland Sample

One of the most important components of the developmental environment is the emotional atmosphere. Childhood experiences and perceptions of parental roles and behavior result in memory models and images, which may affect the children’s relationships in adulthood. In the present study, the cross-sectional associations between childhood parental images and the quality of current intimate adult relationships were studied in a sub-study of a mother–child follow-up in northern Finland. The data were collected with a questionnaire mailed to 28–29-year-old adults, with a total of 337 replies. The present study included those respondents (N = 253) who were married or cohabiting (153 women, 100 men). Since offspring can be affected by gender-specific parenting patterns, the analyses were made separately for both genders. In women, supportiveness in both maternal and paternal images was associated with a balanced intimate relationship, the latter also being associated with a loving relationship and providing protection against quarrelsome and repressive–submissive aspects of the relationship. In men, maternal supportiveness was linked with a balanced and loving intimate relationship and protected against a quarrelsome relationship. Paternal domination was associated with repressive–submissive relationships regardless of gender. In conclusion, the qualities of recalled childhood parenting are important to adult well-being in intimate relationships in a gender-specific manner. The specific importance of the father to the children’s later life was also observed. This would indicate that supporting the relationship of the child with both parents is equally important for professionals working with children and families.     

Dyadic processes between mothers and preterm infants: Development at ages 2 to 5 years

In order to identify antecedents to cognitive, language, and social competence from 2 to 5 years of age in preterm children at biological and social risk, this study used multiple procedures, administered in the laboratory, at 13 and 20 months, to measure components of the social interactions between 51 mothers and their preterm infants. Two variables, maternal responsiveness to infant vocalization and infant irritability, were found to be significant predictors of later competence. Whereas greater maternal responsiveness, as expected, led to increased language and social skills, greater infant irritability during stressful situations also foretold later increased competence in expressive and receptive language and social cognition. Children born at higher birthweights and with longer gestations were more likely to be more irritable than those born at very low birthweights. The findings suggest different implications for negative affect in preterms who have experienced respiratory distress as contrasted to full-term children, but indicate similar positive consequences for maternal verbal responsiveness.     

Preliminary evidence for a fronto‐parietal dysfunction in able‐bodied participants with a desire for limb amputation

Background. Reports of able‐bodied participants with the persisting desire for limb amputation raise legal and ethical questions that are partly due to insufficient empirical knowledge about the condition. Here, we searched for potential neurological mechanisms in participants with desire for limb amputation in order to help develop adequate nosological classifications, diagnosis, and treatment. Methods. Semi‐structured interviews were carried out with 20 participants who self‐identified themselves as able‐bodied individuals desiring amputation of a limb. Results. The results suggest that amputation desire is not unspecific, but in most cases specific for a circumscribed part of the body. Most frequently affected was the leg, mostly on the left, non‐dominant side. Left‐sidedness and limb specificity was associated with elementary and complex somatosensory disturbances of the affected limb akin to those reported by neurological patients. The most frequent neurological co‐morbidity was migraine headache. Conclusions. These results document the existence of an unusual condition in able‐bodied participants characterized by a person's desire for the amputation of one or more particular limbs. Left‐sidedness, limb specificity and somatosensory disturbances of the affected limb are suggestive of abnormal brain mechanisms in right fronto‐parietal cortex. Based on this association we suggest that desire for limb amputation may be conceptualized as asomatognosia due to disturbed integration of multi‐sensory information of the affected body parts into a coherent cerebral representation of the own body. This suggestion has to be regarded with caution as we did not perform any neurological examination.     

Leftists’ and rightists’ IQ as a function of stereotype salience

This study examined the intellectual performance of leftists (or liberals) and rightists (or conservatives) when a stereotype about members of a disadvantaged outgroup (immigrants) is salient. Building on system-justification theory (SJT) and the motivated social cognition approach of political conservatism, it was predicted that when the stereotype about immigrant students’ underachievement is salient in academic settings, leftist students would perform worse, whereas rightist students would perform better than in a control condition. In two samples, Swiss native students were first reminded (or not) of the stereotype and then performed a difficult intellectual test. The results yielded support for the predictions. These findings illustrate how different ideological motives (system-challenging vs. system-justifying) might influence performance among leftist and rightist students.     

Performance boosts in the classroom: Stereotype endorsement and prejudice moderate stereotype lift

The present study (N = 293) examined whether stereotype endorsement and prejudice moderate stereotype lift (i.e., a performance boost caused by the salience of a negative out-group stereotype in the testing situation). The stereotype in the focus of inquiry was the belief that immigrant students have lower intellectual ability than native students. French native high school students performed an intellectual test in a condition of low stereotype salience (the test was presented as assessing individual differences) or in a condition of high stereotype salience (the test was presented as assessing group differences between African immigrants and native students). As expected, results indicated that native students high in stereotype endorsement and those high in prejudice performed better in the high than in the low stereotype salience condition, whereas those low on these constructs did not. By identifying two moderators of stereotype lift, this study sheds new light on the achievement gap between immigrant and native students in educational institutions.