Use of statistical techniques in studies of suicide seasonality, 1970 to 1997

The effect of seasons on suicides has been suggested repeatedly. In order to reveal a true seasonal pattern, an appropriate statistical technique, which is sensitive to a specific type of cyclic variation in the data, must be chosen. This study is a review of the use of statistical techniques for seasonality and of some important characteristics of study samples that were evaluated from 46 original suicide seasonality articles published in major psychiatric journals. The results showed that statistical techniques were applied in a majority of articles, but they were commonly lacking regarding analyses, which compared seasonal patterns among subgroups of a population. In recent studies more sophisticated statistical techniques were utilized for seasonality, like spectral analyses, as compared with earlier studies, in which the emphasis was on chi-square tests. Lack of reporting essential features of the data, such as the sample size and monthly values of suicides, were frequent. The calendar effect was adjusted only in 11 studies. Some recommendations concerning the methodological and reporting issues are summarized for future articles on the seasonal affect on suicides.     

Maternal depression and dyadic interaction: the role of maternal attachment style

Maternal mental health and the contents of her representational world are important determinants of early parent–child relationship. We examined, first, the role of prenatal and postnatal depressive symptoms and maternal attachment style in predicting the quality of mother–child interaction. Second, we analysed whether the secure‐autonomous attachment style can protect the dyadic interaction from the negative effects of maternal depression. The participants were 59 mother–infant pairs examined during pregnancy (T1), 4–5 months postpartum (T2) and when the children were approximately 14 months old (T3). Maternal attachment style was assessed with a modified Adult Attachment Interview ‐procedure, depressive symptoms with Edinburgh Postnatal Depression Scale, and observed mother–child interaction with Care Index. The results show that autonomous mothers were more sensitive and responsive and their children more co‐operative than dyads with dismissing maternal attachment style. As hypothesized, mothers with the combination of both prenatal and postpartum depressive symptoms were highly unresponsive in their dyadic interaction. Further, prenatal depressive symptoms had a stronger impact on maternal unresponsiveness than postnatal symptoms. As hypothesized, mother's autonomous attachment style protected the mother–child interaction from the negative impact of maternal postnatal depressive symptoms, whereas dyads with preoccupied mothers were especially at risk for interaction problems when mothers had postpartum depressive symptoms. Copyright © 2010 John Wiley & Sons, Ltd.     

Religious Unbelief in Three Western European Countries: Identifying and Characterizing Unbeliever Types Using Latent Class Analysis

The different forms of religious unbelief are still much of an open question. Using data (N = 4,404) from three European countries—Finland, Denmark, and the Netherlands—we sought to identify underlying unbeliever groups among those with the strongest disbelief in God (N = 2,258). Latent class analyses were conducted on the nontheistic supernatural beliefs of this subsection of participants, resulting in the same three unbeliever groups in each country: analytic atheists, spiritual but not religious (SBNR), and uncertain nonbelievers. Next, we explored these groups on a variety of dimensions, especially on the group members’ attitudes to religion, certainty of beliefs, cognitive dispositions, and worldview. One-way analyses of variance (ANOVAs) revealed similarities as well as distinct characters for each of the latent groups. The groups differed most in intuitive thinking style, overmentalizing bias, and other ontological confusions. To compare the latent groups to all other individuals who took part in the study, two discriminant analyses were run with all participants. This resulted in four meaningful dimensions that supported and extended the ANOVAs findings and allowed for the consideration of other (non)believers. Overall, this study supports earlier findings on analytic atheists and SBNR while providing new information about their dispositions. Of interest, the uncertain nonbeliever group has been largely unexplored previously, and it should gain more attention in future studies.     

Stable same‐sex friendships with higher achieving partners promote mathematical reasoning in lower achieving primary school children

This study was designed to investigate friend influence over mathematical reasoning in a sample of 374 children in 187 same‐sex friend dyads (184 girls in 92 friendships; 190 boys in 95 friendships). Participants completed surveys that measured mathematical reasoning in the 3rd grade (approximately 9 years old) and 1 year later in the 4th grade (approximately 10 years old). Analyses designed for dyadic data (i.e., longitudinal actor‐partner interdependence model) indicated that higher achieving friends influenced the mathematical reasoning of lower achieving friends, but not the reverse. Specifically, greater initial levels of mathematical reasoning among higher achieving partners in the 3rd grade predicted greater increases in mathematical reasoning from 3rd grade to 4th grade among lower achieving partners. These effects held after controlling for peer acceptance and rejection, task avoidance, interest in mathematics, maternal support for homework, parental education, length of the friendship, and friendship group norms on mathematical reasoning.     

Avicenna on Negative Judgement

Topoi - Avicenna’s logical theory of negative judgement can be seen as a systematic development of the insights Aristotle had laid out in the De interpretatione. However, in order to grasp...