Defining features of natural kinds and artifacts

Two experiments investigated the role of three types of features (physical characteristics, functions, and chromosomal/molecular structure) in determining membership in natural kind and artifact categories. In the first, subjects decided if an object X would still be an X if it were different in one type of feature. A significant interaction was found between word type and change type, with the effects of chromosomal/molecular changes significantly greater for natural kinds than for artifacts, and the effects of functional changes significantly greater for artifacts than natural kinds. In the second experiment, subjects judged whether something would be an X if it were unlike instances of X in two of the above types of features, but like instances of X in one. There was again a significant interaction, with the effects of chromosomal/molecular features significantly greater for natural kinds than for artifacts, and the effects of functional changes significantly greater for artifacts than for natural kinds. These results suggest that chromosomal/molecular features define membership in natural kind categories and functional features define membership in artifact categories. The implications of these findings for the meaning of defining features are also discussed.The first experiment was conducted by the first author as part of a senior comprehensive exercise at Carleton College. We thank Kathleen Galotti, Matthew Gish, Neil Lutsky, and an anonymous reviewer for comments on earlier drafts of this article.     

Delayed neurotoxicity associated with therapy for children with acute lymphoblastic leukemia

Most children diagnosed today with acute lymphoblastic leukemia (ALL) will be cured. However, treatment entails risk of neurotoxicity, causing deficits in neurocognitive function that can persist in the years after treatment is completed. Many of the components of leukemia therapy can contribute to adverse neurologic sequelae, including craniospinal irradiation, nucleoside analogs, corticosteroids, and antifolates. In this review, we describe the characteristic radiographic findings and neurocognitive deficits seen among survivors of childhood ALL. We summarize what is known about the pathophysiology of delayed treatment-related neurotoxicity, with a focus on the toxicity resulting from pharmacologic disruption of folate physiology within the central nervous system. Finally, we suggest testable strategies to ameliorate the symptoms of treatment-related neurotoxicity or decrease its incidence.     

MMPI-2 assessment of malingered emotional distress related to a workplace injury: a mixed group validation

In this study, we examined the capacity of MMPI-2 (Butcher, Dahlstrom, Graham, Tellegen, & Kaemmer, 2001) validity indexes to identify malingered depression associated with a workplace injury. We compared 27 graduate students simulating depression with archival records of 33 inpatients diagnosed with major depressive disorder. We employed a mixed-group validation design to generate true positive rates (TPR) and false positive rates (FPR) for the various MMPI-2 validity scales [F, FB, F(p), FBS, F - K, Ds2] while we accounted for base rates of malingering in each sample. The Fake Bad scale (FBS) was the only validity measure that produced acceptable TPR and FPR or a significant correlation with malingering status.     

Adolescent coping and support across multiple social environments

This paper considers how research on stress, coping, and social support in adolescence may be informed by a social ecological perspective. Two case studies are presented which examine contrasting strategies by which adolescents at risk may cope successfully. One strategy focuses on the use of a strong peer social network, the other on the use of school involvements. In both cases, the analyses emphasize coping and social network processes across multiple social environments. Preventive social-community interventions are suggested to circumvent potential trouble spots associated with the use of these strategies.     

Profiles of everyday executive function in acquired and developmental disorders.

Executive function profiles were examined within and between several clinical disorders via the multi-domain Behavior Rating Inventory of Executive Function (BRIEF; Gioia, Isquith, Guy, & Kenworthy, 2000). Parent ratings of children with Inattentive and Combined types of Attention-Deficit/Hyperactivity Disorder (ADHD-I, ADHD-C), Autistic Spectrum Disorders (ASD), moderate and severe Traumatic Brain Injury (TBI), and Reading Disabilities (RD) were compared with controls. Profile analysis revealed significant (p<.01) and substantial (eta2>.10) differences in global elevations and in profile of scale elevations between diagnostic groups. ASD, ADHD-I and ADHD-C groups exhibited greater elevations across the BRIEF scales than did RD and Severe TBI groups, who were in turn more elevated than Moderate TBI and Control groups. The ADHD-C group was unique in its frequency and severity of inhibitory deficits, while the ASD group was distinguishable by its deficits in flexibility. Within diagnostic groups, relative risk for executive dysfunction was calculated with variability present in the frequency of clinically elevated scales. While the BRIEF captures executive profiles characteristic of specific disorders in the clinical setting, it is not diagnostic in its own right and is best used within the context of a broad based evaluation.     

Father Involvement and Young,Rural African American Men’s Engagement in Substance Misuse and Multiple Sexual Partnerships

This study was designed to examine the associations of biological father and social father involvement during childhood with African American young men’s development and engagement in risk behaviors. With a sample of 505 young men living in the rural South of the United States, a dual mediation model was tested in which retrospective reports of involvement from biological fathers and social fathers were linked to young men’s substance misuse and multiple sexual partnerships through men’s relational schemas and future expectations. Results from structural equation modeling indicated that levels of involvement from biological fathers and social fathers predicted young men’s relational schemas; only biological fathers’ involvement predicted future expectations. In turn, future expectations predicted levels of substance misuse, and negative relational schemas predicted multiple sexual partnerships. Biological fathers’ involvement evinced significant indirect associations with young men’s substance misuse and multiple sexual partnerships through both schemas and expectations; social fathers’ involvement exhibited an indirect association with multiple sexual partnerships through relational schemas. Findings highlight the unique influences of biological fathers and social fathers on multiple domains of African American young men’s psychosocial development that subsequently render young men more or less likely to engage in risk behaviors.     

Productive and Re‐productive Thinking in Solving Insight Problems

Many innovations in organizations result when people discover insightful solutions to problems. Insightful problem‐solving was considered by Gestalt psychologists to be associated with productive, as opposed to re‐productive, thinking. Productive thinking is characterized by shifts in perspective which allow the problem solver to consider new, sometimes transformational, approaches. Re‐productive thinking, on the other hand, involves the application of familiar, routine, procedures. This article reports a study which investigated how self‐reported productive and re‐productive thinking are related to an individual's ability to solve insight problems. Our measures were tested against the Kirton Adaption‐Innovation Inventory (KAI), and a battery of spatial insight problems. The results indicated that productive and re‐productive thinking and the KAI were successful in predicting performance on spatial insight problems. Furthermore, the measures of productive and re‐productive thinking accounted for spatial insight performance independently of scores on the KAI. In addition, the results suggested that re‐productive thinking consists of two different components—one based on group conventions and the other on personal experience. Each contributed differently to solving insight problems.