Truth and consequences of ordinal differences in statistical distributions: toward a theory of hierarchical inference

A theory is presented that establishes a dominance hierarchy of potential distinctions (order relations) between two distributions. It is proposed that it is worthwhile for researchers to ascertain the strongest possible distinction, because all weaker distinctions are logically implied. Implications of the theory for hypothesis testing, theory construction, and scales of measurement are considered. Open problems for future research are outlined.     

BRIEF REPORT Gratitude and prosocial behaviour: An experimental test of gratitude

McCullough, Kilpatrick, Emmons, and Larson (2001) posited that gratitude prompts individuals to behave prosocially. However, research supporting the prosocial effect of gratitude has relied on scenario and self-report methodology. To address limitations of previous research, this experiment utilised a laboratory induction of gratitude, a method that is potentially more covert than scenarios and that elicits actual grateful emotion. Prosocial responses to gratitude—operationalised as the distribution of resources to another—were paired with a self-report measure of gratitude to test the prosocial effect of gratitude. To investigate positive mood as an alternative explanation, this experiment compared responses of individuals receiving a favour to responses of individuals receiving a positive outcome by chance. A total of 40 participants were randomly assigned to either a Favour or Chance condition. Participants receiving a favour helped more and reported more gratitude compared to participants in the Chance condition.     

An Analysis of Air-Stepping in Normal Infant Vervet Monkeys

Limb movements during air-stepping were analyzed in three neonatal vervet monkeys over a three-week period. The movements had similar temporal organization both across animals and across time. For example, the duration of both the hind and the forelimb cycle equaled about 500 ms, with the hind limb return strokes lasting much longer than the hind limb power strokes. Furthermore, there were clear indications of both intra- and interlimb coordination. Specifically, all the joints of a limb tended to flex and extend simultaneously, and contralateral and ipsilateral limb pairs had an average phase relationship of approximately 50% of cycle duration. Despite a qualitative similarity between limb movements during air-stepping in the neonates and overground locomotion in older animals, there were notable differences both in temporal relationships and joint displacement patterns. Finally, there appeared to be important similarities between air-stepping in these monkeys and stepping in newborn humans. Most notably, both tended to disappear after a limited period. The implications of these similarities, as well as the overall results, are discussed in relation to the understanding of the development of locomotor behavior in human and nonhuman primates, using approaches based both upon the hard-wired and dynamic models.     

Introduction to special issue on contributions of mathematical psychology to clinical science and assessment

Evolution of clinical mathematical psychology, exemplifying integrative, translational psychological science, is considered in light of target, idealized scientific systems. It is observed that mutual benefits to psychological clinical science, and quantitative theory, potentiated through their interlacing as exemplified in this special issue, stand to parallel the historical symbiosis between older disciplines and mathematics. Enumerated are the range of psychological processes and clinical groups addressed, forms of modeling implemented, and clinical issues engaged, the latter ranging from intervention, to elucidation of deviant basic processes. A denouement comprising cogent quotations from historical figures in science concludes this Introduction.     

Medial temporal lobe memory in childhood: developmental transitions

The medial temporal lobes (MTL) support declarative memory and mature structurally and functionally during the postnatal years in humans. Although recent work has addressed the development of declarative memory in early childhood, less is known about continued development beyond this period of time. The purpose of this investigation was to explore MTL‐dependent memory across middle childhood. Children (6 –10 years old) and adults completed two computerized tasks, place learning (PL) and transitive inference (TI), that each examined relational memory, as well as the flexible use of relational learning. Findings suggest that the development of relational memory precedes the development of the ability to use relational knowledge flexibly in novel situations. Implications for the development of underlying brain areas and ideas for future neuroimaging investigations are discussed.     

The Role of Attachment Style in Predicting Repetition of Adolescent Self‐Harm: A Longitudinal Study

This study investigated whether insecure attachment is associated with poorer outcomes at 6‐month follow‐up in adolescents who self‐harm. At baseline the Child Attachment Interview was administered to 52 adolescents (13‐17 years) referred to specialist child and adolescent mental health services and with a recent history of self‐harm. Participants also completed self‐report measures of self‐harm, peer attachment, anxiety, and depression and were administered the means end problem‐solving task. Self‐harm behavior and problem‐solving skills were assessed again at 6‐month follow‐up. At baseline, 14 (27%) were securely attached to their mothers. In the 49 (94%) adolescents followed‐up, those with insecure maternal attachment and insecure peer attachment were more likely to have repeated self‐harm. In addition, securely attached adolescents showed greater improvement in problem‐solving skills. These findings indicate that secure maternal and peer attachments may help recovery from self‐harm, possibly by supporting the acquisition of problem‐solving skills, and highlights the importance of social connections and attachments for youth with a history of self‐harm.     

Functional principal components analysis of workload capacity functions

Workload capacity, an important concept in many areas of psychology, describes processing efficiency across changes in workload. The capacity coefficient is a function across time that provides a useful measure of this construct. Until now, most analyses of the capacity coefficient have focused on the magnitude of this function, and often only in terms of a qualitative comparison (greater than or less than one). This work explains how a functional extension of principal components analysis can capture the time-extended information of these functional data, using a small number of scalar values chosen to emphasize the variance between participants and conditions. This approach provides many possibilities for a more fine-grained study of differences in workload capacity across tasks and individuals.     

Connectedness: A Review of the Literature With Implications for Counseling,Assessment, and Research

In this article, the authors review the current conceptual and empirical literature from a variety of disciplines dealing with the construct of connectedness. A working definition of connectedness is provided along with a discussion of its multidimensional nature and major characteristics. Its relationship with a variety of other variables is also presented. Particular attention is given to gender and cultural considerations in the experience and operationalization of connectedness. Recommendations for counseling, assessment, and research related to connectedness are provided.     

Nice Guys Finish Fast and Bad Guys Finish Last: Facilitatory vs. Inhibitory Interaction in Parallel Systems

Systems Factorial Technology is a powerful framework for investigating the fundamental properties of human information processing such as architecture (i.e., serial or parallel processing) and capacity (how processing efficiency is affected by increased workload). The Survivor Interaction Contrast (SIC) and the Capacity Coefficient are effective measures in determining these underlying properties, based on response-time data. Each of the different architectures, under the assumption of independent processing, predicts a specific form of the SIC along with some range of capacity. In this study, we explored SIC predictions of discrete-state (Markov process) and continuous-state (Linear Dynamic) models that allow for certain types of cross-channel interaction. The interaction can be facilitatory or inhibitory: one channel can either facilitate, or slow down processing in its counterpart. Despite the relative generality of these models, the combination of the architecture oriented plus the capacity oriented analyses provide for precise identification of the underlying system.