SodaConstructing knowledge through exploratoids

In this article, we describe a preliminary study that integrates research on engineering design activities for K‐12 students with work on microworlds as learning tools. Here, we extend these bodies of research by exploring whether—and how—authentic recreations of engineering practices can help students develop conceptual understanding of physics. We focus on the design–build–test (DBT) cycle used by professional engineers in simulation‐based rapid modeling. In this experiment, middle‐school students worked for 10 hr during a single weekend to solve engineering design challenges using SodaConstructor, a Java‐based microworld, as a simulation environment. As a result of the experiment, students learned about center of mass. Our data further suggest that in the process of simulation‐based modeling, rapid iterations of the DBT cycle progressively linked students' interest in the design activities and understanding of the concept of center of mass. We suggest that these rapid iterations of the DBT cycle functioned as exploratoids: short fragments of exploratory action in a microworld that cumulatively develop interest in and understanding of important scientific concepts. © 2006 Wiley Periodicals, Inc. J Res Sci Teach     

The relation of emotional maltreatment to early adolescent competence: Developmental processes in a prospective study

ObjectivesThis investigation examined developmental pathways between childhood emotional maltreatment and adaptational outcomes in early adolescence. This study utilized a developmental psychopathology perspective in adopting a multidimensional approach to the assessment of different forms of emotional maltreatment and later adjustment outcomes. Specifically, emotional abuse (i.e., verbal criticism, hostility) and emotional neglect (i.e., psychological unavailability) were compared using a process-level analytic approach to examine if and how different forms of emotional maltreatment would contribute to adolescent adjustment via aggression and social withdrawal in middle childhood.MethodsThe current study sample is drawn from a longitudinal, prospective study of a high-risk community sample (N = 196), incorporating a multi-method and multi-informant design. Multiple mediator models were tested via bootstrapping regression techniques.ResultsBivariate correlations revealed that both emotional neglect and emotional abuse were associated with increased aggression and social withdrawal in middle childhood, and lower ratings of socioemotional competence in early adolescence. However, the mediational model, which controlled for child gender and concurrent physical and sexual maltreatment, was only significant for the contribution of emotional abuse to lower adolescent competence via social withdrawal in middle childhood. Post hoc analyses revealed that this association was only significant for boys.ConclusionsWhile social withdrawal in middle childhood significantly explained the observed relation between emotional abuse and decreased competence in adolescence, this process did not emerge as salient in understanding the relation between emotional neglect and adolescent adaptation. Furthermore, these developmental processes appeared to vary by gender. The results are in need of replication and extension to other outcome domains, but represent an important contribution to the empirical study of specific forms of emotional maltreatment.Practice implicationsEmotional maltreatment is generally overlooked and unrecognized as compared to physical or sexual forms of maltreatment. This study adds to the accumulating empirical evidence that the effects of emotional maltreatment are disabling, enduring, and should be carefully assessed by clinicians. Furthermore, this assessment should specify the particular form of emotional maltreatment that has occurred, as the results of the study indicate that developmental processes and adjustment outcomes may vary according the type of emotional maltreatment (i.e., emotional abuse, emotional neglect) that is experienced. Finally, clinicians must recognize that a single maltreatment type may vary in its impact on subsequent adjustment, as significant gender differences emerged in the current study that point to the role of individual differences that warrant further investigation.     

Child sexual and physical abuse among college students in Singapore and the United States

OBJECTIVES: The purpose of this study was to explore differences in rates and characteristics of child sexual and physical abuse experiences among women in Singapore and the US. METHOD: Participants (N=153) completed an anonymous questionnaire which assessed experiences of childhood sexual and physical abuse, abuse characteristics (e.g., victimization age, severity), and behavioral and subjective reactions to such experiences (e.g., labeling of experiences as abuse, psychological symptomatology). Exposure to other forms of traumatic life events was also assessed. RESULTS: In comparison to Singaporean women, US women were more likely to report a history of child sexual abuse, and to report experiencing more severe forms of sexual abuse. Women in Singapore were more likely than women in the US to report a history of child physical abuse, to report experiencing injury as a result of the abuse, and to disclose the abuse. Singaporean women with a history of child sexual abuse reported elevated psychological symptom levels relative to their nonabused peers and to US women with a history of child sexual abuse, even after controlling for exposure to other types of traumatic events. No significant differences in symptomatology with regard to child physical abuse were observed. CONCLUSIONS: Although preliminary in nature, the present findings are among the first to demonstrate differences in psychological adjustment between sexually abused and nonabused Asian women living in Asia. This study also provides some of the first support for cross-national differences in the psychological adjustment of child sexual abuse survivors.     

Mathematics and Virtual Culture: an Evolutionary Perspective on Technology and Mathematics Education

This paper suggests that from a cognitive-evolutionary perspective, computational media are qualitatively different from many of the technologies that have promised educational change in the past and failed to deliver. Recent theories of human cognitive evolution suggest that human cognition has evolved through four distinct stages: episodic, mimetic, mythic, and theoretical. This progression was driven by three cognitive advances: the ability to ‘represent’ events, the development of symbolic reference, and the creation of external symbolic representations. In this paper, we suggest that we are developing a new cognitive culture: a ‘virtual’ culture dependent on the externalization of symbolic processing. We suggest here that the ability to externalize the manipulation of formal systems changes the very nature of cognitive activity. These changes will have important consequences for mathematics education in coming decades. In particular, we argue that mathematics education in a virtual culture should strive to give students generative fluency to learn varieties of representational systems, provide opportunities to create and modify representational forms, develop skill in making and exploring virtual environments, and emphasize mathematics as a fundamental way of making sense of the world, reserving most exact computation and formal proof for those who will need those specialized skills. This revised version was published online in July 2006 with corrections to the Cover Date.