When children ask, "What is it?" what do they want to know about artifacts?

When children ask, "What is it?" are they seeking information about what something is called or what kind of thing it is? To find out, we gave 2-, 3-, and 4-year-olds (32 at each age) the opportunity to inquire about unfamiliar artifacts. An ambiguous question was answered with a name or with functional information, depending on the group to which the children were assigned. Children were inclined to follow up with additional questions about the object when they had been told its name, but seemed satisfied with the answer when they had been told the object's function. Moreover, children in the name condition tended to substitute questions about function for ambiguous questions over the course of the session. These results indicate that children are motivated to discover what kinds of things novel artifacts are, and that young children, like adults, conceive of artifact kinds in terms of their functions.     

Measuring individual differences in statistical learning: Current pitfalls and possible solutions

Most research in statistical learning (SL) has focused on the mean success rates of participants in detecting statistical contingencies at a group level. In recent years, however, researchers have shown increased interest in individual abilities in SL, either to predict other cognitive capacities or as a tool for understanding the mechanism underlying SL. Most if not all of this research enterprise has employed SL tasks that were originally designed for group-level studies. We argue that from an individual difference perspective, such tasks are psychometrically weak, and sometimes even flawed. In particular, the existing SL tasks have three major shortcomings: (1) the number of trials in the test phase is often too small (or, there is extensive repetition of the same targets throughout the test); (2) a large proportion of the sample performs at chance level, so that most of the data points reflect noise; and (3) the test items following familiarization are all of the same type and an identical level of difficulty. These factors lead to high measurement error, inevitably resulting in low reliability, and thereby doubtful validity. Here we present a novel method specifically designed for the measurement of individual differences in visual SL. The novel task we offer displays substantially superior psychometric properties. We report data regarding the reliability of the task and discuss the importance of the implementation of such tasks in future research.     

The Validation of a Five-Item Screening Scale for Personality Disorders in Dutch-Speaking Community Adolescents and Adults

In Section III of the Diagnostic and Statistical Manual of Mental Disorders – fifth edition (DSM-5), an Alternative Model for Personality Disorders (AMPD) is proposed, including a criterion for personality functioning impairment (Criterion A) to assess severity of personality pathology. The present study examined the structure, reliability, and convergent validity of the Dutch version of a five-item screening scale for Criterion A—the Five-Item Screening Scale for Personality Disorders (FISSPD; Skodol et al., in Personality Disorders: Theory, Research, and Treatment, 2, 4-22, 2011)—in a community sample of 1,477 adolescents and 546 adults. To assess convergent validity, identity and personality (pathology) questionnaires were completed by adolescents and adults. Confirmatory factor analysis yielded a single factor structure for the FISSPD, which proved to be (partially) invariant across age and gender. Adequate reliability coefficients were obtained for the FISSPD. In both the adolescent and adult sample, significant correlations were found between the FISSPD and consolidated identity (negative) and disturbed identity/lack of identity (positive). In the adult sample, the FISSPD showed significant correlations with several personality disorders (and especially with the borderline personality disorder), maladaptive personality traits (Criterion B of the AMPD), and general personality impairment. In the adolescent sample, the FISSPD was positively correlated with borderline personality disorder characteristics. Furthermore, significant correlations were found with the Big-Five personality traits in the adolescent sample: the FISSPD correlated significantly positive with neuroticism, and negative with extraversion, agreeableness, and conscientiousness. In sum, the present study supports the reliability and validity of the FISSPD to screen for (severity of) personality pathology.

     

Investigating the Co‐Occurrence of Self‐Mutilation and Suicide Attempts among Opioid‐Dependent Individuals

The prevalence and risk factors associated with self‐mutilation among opioid dependent cases and controls were determined, and the co‐occurrence of self‐mutilation and attempted suicide was examined. The prevalence of self‐mutilation among cases and controls did not differ significantly (25% vs. 23%, respectively), with gender differences identified among cases only. A number of risk factors were found to be associated with self‐mutilation, including borderline personality disorder, alcohol dependence, childhood sexual abuse, and multiple suicide attempts. Not only is self‐mutilation a clinically significant problem, but when combined with a history of attempted suicide, the psychological dysfunction observed is markedly high.