Using Statistical Models of Morphology in the Search for Optimal Units of Representation in the Human Mental Lexicon

Determining optimal units of representing morphologically complex words in the mental lexicon is a central question in psycholinguistics. Here, we utilize advances in computational sciences to study human morphological processing using statistical models of morphology, particularly the unsupervised Morfessor model that works on the principle of optimization. The aim was to see what kind of model structure corresponds best to human word recognition costs for multimorphemic Finnish nouns: a model incorporating units resembling linguistically defined morphemes, a whole‐word model, or a model that seeks for an optimal balance between these two extremes. Our results showed that human word recognition was predicted best by a combination of two models: a model that decomposes words at some morpheme boundaries while keeping others unsegmented and a whole‐word model. The results support dual‐route models that assume that both decomposed and full‐form representations are utilized to optimally process complex words within the mental lexicon.     

A Quiet Revolution: The Birth of the Genetic Counselor at Sarah Lawrence College, 1969

In 1969 Melissa Richter founded the first master’s degree genetic counseling program in the country at Sarah Lawrence College in Bronxville, New York. This article examines the myriad factors that contributed to the birth of the genetic counselor and situates this historical watershed in its social, cultural, academic, and medical context. This article highlights Richter’s prescience and path-breaking vision, evaluates the Sarah Lawrence program during the years of her directorship (1969–1972), and explores how this early foundation subsequently shaped the field of genetic counseling. Close attention is paid to the ethical issues that concerned Richter and their ongoing relevance to genetic health professionals today. This article is based on historical research in archives, consultation of primary sources, and oral history interviews with genetic counselors, geneticists, and allied professionals.     

The role of Theory of Mind in assessing cooperative intentions

Folk wisdom indicates that people vary in the extent to which they can assess others’ cooperative intentions. In two studies we investigated whether Theory of Mind (ToM), the ability to represent mental states of others, is related to accuracy in the recognition of cooperativeness. Participants completed a ToM task and were asked to assess either video clips of people playing a variation of a Prisoner’s Dilemma (PD) game (Study 1, N = 88), or photographs of people playing PD taken at the very moment when they were expressing a decision to cooperate or to defect (Study 2, N = 99). We found relationships between ToM and cooperative intention recognition only in Study 1, when participants were exposed to long versions of the video clips. In contrast to previous reports, participants in our samples did not score higher than chance in cooperativeness assessment except for Study 1 in the condition with short video clips. Our results question human expertise at identifying defectors and cooperators and do not provide clear support for an association between ToM and cooperativeness assessment. The findings are discussed from the perspective of an evolutionary arms race between interpreting and masking cooperative intentions.     

Evidence for an Evolutionary Cheater Strategy—Relationships Between Primary and Secondary Psychopathy,Parenting, and Shame and Guilt

In the present study, shame and guilt proneness were investigated in relation to primary and secondary psychopathy, looking at parental care as a possible mediator. A sample of 388 volunteers participated in an on-line study, completing several self-report measurements. Primary psychopathy, robust to parental care and sex of the participant, was associated with lower guilt proneness after a private transgression and lower negative self-evaluations after a public transgression. Secondary psychopathy was not associated with guilt or shame proneness. Paternal care played a mediating role between primary psychopathy and guilt, but only in male participants. High paternal care was associated with lower guilt repair in high psychopathy males, suggesting that a positive father-son relationship might be essential for development of exploitive strategies in primary psychopathy. The results highlight the fundamental differences between primary and secondary psychopathy, and provide support for the idea that primary psychopathy is an evolutionary cheater-strategy.     

Training counting skills and working memory in preschool

Previous studies have shown that early numeracy skills predict later mathematics learning and that they can be improved by training. Cognitive abilities, especially working memory (WM), play an important role in early numeracy, as well. Several studies have shown that working memory is related to early numeracy. So far, existing literature offers a good few examples of studies in which WM training has led to improvements in early numerical performance as well. In this study, we aim at investigating the effects of two different training conditions: (1) counting training; and (2) simultaneous training of WM and counting on five‐ to six‐year‐old preschoolers' (N = 61) counting skills. The results show that domain‐specific training in mathematical skills is more effective in improving early numerical performance than WM and counting training combined. Based on our results, preschool‐aged children do not seem to benefit from short period group training of WM skills. However, because of several intervening factors, one should not conclude that young children's WM training is ineffectual. Instead, future studies should be conducted to further investigate the issue.     

Intercorrelations and developmental pathways of mothers' and fathers' loneliness during pregnancy,infancy and toddlerhood – STEPS study

Our aim was to study the inter‐correlations and developmental pathways of mothers' and fathers' social and emotional loneliness during pregnancy (20th pregnancy week), infancy (child aged 8 months), and early childhood (child aged 18 months). Moreover, we aimed to study whether mothers and fathers who have different developmental profiles (identified by latent growth curve mixture models) differ in their experiences of marital dissatisfaction (RDAS), social phobia (SPIN) and depression (BDI) during pregnancy. Both mothers' social and emotional loneliness and fathers' social and emotional loneliness were highly stable, and within individuals these loneliness factors were strongly correlated. However, the correlations between mothers' loneliness experiences and fathers' loneliness experiences were weaker than expected. Separate latent growth curve groups were identified, which differed in feelings of marital dissatisfaction, social phobia, and depression. These groupings revealed that the higher the loneliness was, the more the parents experience these other psychosocial problems.     

Creatures of the night: Chronotypes and the Dark Triad traits

In this study (N = 263) we provide a basic test of a niche-specialization hypothesis of the Dark Triad (i.e., narcissism, psychopathy, and Machiavellianism). We propose that in order to best enact a “cheater strategy” those high on the Dark Triad traits should have optimal cognitive performance and, thus, have a night-time chronotype. Such a disposition will take advantage of the low light, the limited monitoring, and the lessened cognitive processing of morning-type people. The Dark Triad composite was correlated with an eveningness disposition. This link worked through links with the “darker” aspects of the Dark Triad (i.e., Machiavellianism, secondary psychopathy, and exploitive narcissism); correlations that were invariant across the sexes. While we replicated sex differences in the Dark Triad, we failed to replicate sex differences in chronotype, suggesting eveningness may not be a sexually selected trait as some have argued but is a trait under natural selective pressures to enable effective exploitations of conspecifics by both sexes.     

Digit ratio and risk taking in post-menopausal Finnish women

Although an indicator of prenatal testosterone (PT), 2D:4D ratio, has been extensively studied in the domain of financial risk taking, other domains of risk have received less attention. It is thought that elevated levels of PT relate to more masculinised behaviours, including increased risk taking propensity. In this study, we report negative findings with regards to health (average weekly drinking and daily smoking) and sexual (lifetime number of sexual partners) risk in a sample of post-menopausal Finnish women (N = 146–262). Our results suggest that PT may not masculinise health and sexual risk taking in women, at least at an older age.     

Spontaneous Focusing on Quantitative Relations in the Development of Children's Fraction Knowledge

While preschool-aged children display some skills with quantitative relations, later learning of related fraction concepts is difficult for many students. We present two studies that investigate young children's tendency of Spontaneous Focusing On quantitative Relations (SFOR), which may help explain individual differences in the development of fraction knowledge. In the first study, a cross-sectional sample of 84 kindergarteners to third graders completed tasks measuring their spontaneous recognition and use of quantitative relations and then completed the tasks again with explicit guidance to focus on quantitative relations. Findings suggest that SFOR is a measure of the spontaneous focusing of attention on quantitative relations and the use of these relations in reasoning. In the second (longitudinal) study, 25 first graders completed measures of SFOR tendency and a measure of fraction knowledge three years later. SFOR tendency was found to predict fraction knowledge, suggesting that it plays a role in the development of fraction knowledge.     

Spontaneous focusing on numerosity as a domain-specific predictor of arithmetical skills

The aim of this 2 year longitudinal study was to explore whether children’s individual differences in spontaneous focusing on numerosity (SFON) in kindergarten predict arithmetical and reading skills 2 years later in school. Moreover, we investigated whether the positive relationship between SFON and mathematical skills is explained by children’s individual differences in spontaneous focusing on a non-numerical aspect. The participants were 139 Finnish-speaking children. The results show that SFON tendency in kindergarten is a significant domain-specific predictor of arithmetical skills, but not reading skills, assessed at the end of Grade 2. In addition, the relationship between SFON and number sequence skills in kindergarten is not explained by children’s individual differences in their focusing on a non-numerical aspect that is, spatial locations.