Temperament, Emotion, and Cognition at Fourteen Months: The MacArthur Longitudinal Twin Study

200 pairs of twins were assessed at 14 months of age in the laboratory and home. Measures were obtained of temperament, emotion, and cognition/language. Comparisons between identical and fraternal twin correlations suggest that individual differences are due in part to heritable influences. For temperament, genetic influence was significant for behavioral observations of inhibition to the unfamiliar, tester ratings of activity, and parental ratings of temperament. For emotion, significant genetic influence was found for empathy and parental ratings of negative emotion. The estimate of heritability for parental report of expression of negative emotions was relatively high, whereas that for expression of positive emotions was low, a finding consistent with previous research. For cognition and language, genetic influence was significant for behavioral indices of spatial memory, categorization, and word comprehension. Shared rearing environment appears influential for parental reports of language and for positive emotions, but not for other measures of emotion or for temperament.     

Predictors of Criminal Justice Undergraduates’ Intentions to Pursue Graduate Education in Criminology or Criminal Justice

This study relies on data from 388 junior and senior criminal justice majors to examine predictors of intentions to pursue graduate education in criminology, criminal justice, or a closely related field. Logistic regression results demonstrate that women, students who receive greater encouragement to attend graduate school, students with a lower aversion to reading, writing, and statistics, and students who perceive greater diversity intolerance are more likely to report graduate school intentions. Although students’ race was not found to be significant in the overall model, split-sample models revealed that the significance of predictors varied by race and ethnicity. In discussing the findings, special attention is given to the need for primarily White institutions (PWIs) to partner with historically Black college and universities (HBCUs). We conclude by calling for departments to redouble their efforts to diversify their faculty and student bodies.     

Amnesia induced by hypothermia as a function of treatment-test interval and recooling in rats

In Experiment I, a repeated tests procedure was employed to assess hypothermia-induced amnesia of a footshock experience. Rats tested 4 h after training treatment showed no memory loss, but amnesia was present at 24 h. Although recovery of memory was obtained when the same animals were cooled 2 h prior to a 50-h test, repeated testing also tended to attenuate amnesia. In Experiment II, independent groups were tested at 6 or 50 h after training treatment. Again, memory of the footshock was present at the short, but not at the long, interval. Recooling shortly prior to the 50-h test eliminated amnesia. Experiment III indicated that the return of memory produced by recooling did not persist if testing was delayed. These findings suggested that hypothermia may function as an important contextual cue for memory retrieval.     

Nature watch

Every evening, against the backdrop of a setting sun, scores of both insect and fruit eating bats emerge out in search of food. While most of the bats emerge from pre-existing structures such as caves, crevices and human habitation, some emerge from structures modified by their own efforts. Our interest is particularly in the fruit bats emerging out from modified foliage. Because of their role in the regeneration of tropical forests by dispersing huge numbers of seeds, fruit bats are of profound importance. In this article, we discuss the mating strategy adopted by the Indian short-nosed fruit batCynopterus sphinx, the mechanics of tent-making in this species, and some recent findings which argue for an alternative breeding strategy.     

A comparison of children with and without learning disabilities on social problem-solving skill, school behavior, and family background

The study compared 86 children with learning disabilities (LD) with 86 matched children without learning disabilities (NLD) on three domains of variables: social problem-solving skill, teacher-rated school behavior and competence, and family background. The children with LD and the NLD group differed on variables in all three domains. More specifically, the children with LD were able to generate fewer alternatives for solving social problem situations, showed less tolerance for frustration and less adaptive assertiveness, and had more overall classroom behavior problems and less personal and social competence in a variety of areas as rated by teachers. Children having LD also showed more family background difficulties (e.g., lack of educational stimulation at home, economic difficulties). The findings suggest the need for greater attention to social and behavioral remediation for children with LD and greater involvement of their families, in addition to the cognitive and academic remediation emphasized in existing curricula for children with LD.     

Structuring the Classroom for Performance: Cooperative Learning with Instructor‐Assigned Teams*

The main concern is a longstanding one in classroom instruction—the determinants of effective team performance. The paper explicitly examines the effect of teacher‐controlled factors on the use and functioning of student teams. From a sample of 500 undergraduate students, data are obtained on aptitude, diversity, instability, motivation, personality style, size, and performance. The regression results suggest that team motivation and instability, which are both partly controlled by the instructor, are particularly important in determining a team's performance. An implication is that instructor decisions about team make‐up and incentives can have a significant impact on student achievement.     

Developmental Changes in Achievement Evaluation: Motivational Implications of Self-Other Differences

In order to explore the development of self-evaluative biases, children at 3 age levels (5–6, 7–8, 9–10) evaluated themselves or another child when given social or temporal comparison feedback. Evaluative biases were indicated by higher evaluations for the self than another, especially after failure. Children at different ages were not differentially responsive to temporal vs. social comparison information. However, evaluative bias in response to the type of evaluation differed by age; there was greater bias for general ability evaluations by older children and greater bias for specific performance evaluations by younger children. Alternative explanations for these self-other differences were minimized, as differences in visual orientation were held constant and differences in knowledge of effort were controlled statistically. Other aspects of the design as well as sex differences support a motivational interpretation of these biases. How these biases are manifested is related to children's level of understanding and concerns at different ages.     

Child maltreatment related injuries: incidence, hospital charges, and correlates of hospitalization

OBJECTIVE: This study was undertaken to determine the incidence, hospital charges, and correlates associated with inpatient treatment of child maltreatment related injuries. METHODS: The data were based on the 1995 Pennsylvania Hospital Discharge Data which included all Pennsylvania acute care hospitals that reported child maltreatment discharges. Per capita hospital discharge rates were computed for children discharged with child maltreatment related injuries according to selected variables. Odds ratios for child maltreatment related injury hospitalizations were also computed. RESULTS: A total of 348 maltreated injured children ages 0-19 years were discharged from Pennsylvania hospitals in 1995, representing an incidence rate of 10.8 per 100,000 persons. The total hospital charges for child maltreatment related injury discharges amounted to over $5.4 million, of which Medicaid alone paid for 45%. Compared to a random sample of non-maltreated injured children (n = 1052), maltreated injured children were found to be significantly younger, more likely to be females, and more likely to be Black. Child maltreatment related injury hospitalizations were more likely to be urgent and via physician referral or transfer from other health care facility. Maltreated injured children were three times as likely to die as other children. CONCLUSIONS: These findings indicate that injury from child maltreatment is a major cause of hospitalization of young children 5 years and younger and represents a significant cost to publicly financed health care. While hospital discharge data can be used for population-based surveillance of child maltreatment related trauma, there is need for improvement in the surveillance of these injuries.