A shared-memory approach to microprocessor program development

We have developed hardware and software interfaces with which part of a minicomputer’s memory can be shared among its own programs and an Intel 8080 system. Although access to this shared memory is too slow for most real-time operations, the shared area is an excellent buffer for program code to be copied to faster memory for eventual real-time execution. The shared memory can also be used to pass test data between the processors to automate the testing of 8080 program modules.     

La technique et le langage

Sans résumé     

Aktueller Stand der Gruppenpsychotherapieforschung

In view of an increasing importance of group therapies and the intention in healthcare politics to support group treatment, it seems appropriate to provide a review of the current research efforts in this field. In this review, several research traditions are described with a clear focus on the effectiveness of group treatment. Both systematic narrative reviews and recent meta-analyses clearly demonstrate that group treatment of various disorders is equally as effective as individual psychotherapy. Besides outcome research there are other developments in the field, such as the improvement of manualized and focused group therapies even outside cognitive behavioral concepts. Studies related to feedback in groups, specific patient characteristics (especially alexithymia and attachment) as well as the construction of new measures seem to be characteristic for group research during recent years. There is still a need for research related to group dynamics and process aspects of small groups as well as the group leaders and their behavior. In total, research on group psychotherapy has clearly progressed, which justifies the support of this treatment setting.     

Adjusting researchers’ approach to adjustment: On the use of covariates when testing interactions

A common design in social psychology involves the use of two independent variables, an experimental manipulation and a measured individual difference, and the interest is in the interaction between them. In such designs, there are often obvious covariate(s), correlated with the measured independent variable, which the researcher wishes to control. Typically this is done by including the covariate in the analytic model. We show that in most cases this is an inadequate model. In general, the interaction between the two independent variables will be estimated without bias only when the interaction between the covariate and the manipulated independent variable is included in the analysis. We present simulations showing the factors affecting the magnitude of the bias and provide a survey of recent social psychological literature illustrating the frequency of the problem. Finally, we discuss cases where both independent variables are manipulated and the covariate is a potential mediator.     

Coaction and upward social comparison reduce the illusory conjunction effect: Support for distraction-conflict theory

This article proposes an integration of Festinger’s (1954) social comparison theory and Baron’s (1986) distraction-conflict theory of the social facilitation-inhibition effect, which successfully predicts attentional focusing in coaction when social comparison represents a distraction. Two experiments confronted participants with the illusory conjunction task (Treisman, 1998), where illusions occur because of the lack of attentional processing of central cues. If coaction, like upward comparison, is distracting and thereby enhances the attention allocated to central cues (here the target’s features) at the expense of peripheral cues (here distractors), then a reduction should be found in the illusions. Experiment 1 indeed showed a lower rate of conjunctive errors under upward comparison than under downward comparison. Experiment 2 specified that this effect was due to downward comparison effectively reducing distraction, with upward comparison only maintaining it, as compared to mere coaction.     

Delay discounting: Interactions between personality and cognitive ability

Delay discounting describes the extent to which the value of a reward decreases as the delay to obtaining that reward increases. Lower discounting rates predict better outcomes in social, academic, and health domains. The current study investigates how personality and cognitive ability interact to predict individual differences in delay discounting. Extraversion was found to predict higher discounting rates at the low end of the cognitive distribution, while emotional stability was found to predict lower discounting rates at the high end of the cognitive distribution. These findings support recent models of discounting behavior and suggest that personality and cognitive ability interact in shaping decision making.     

Increasing convergence between imagined and executed movement across development: evidence for the emergence of movement representations

Motor imagery (MI) has become a principal focus of interest in studies on brain and behavior. However, changes in MI across development have received virtually no attention so far. In the present study, children (N = 112, 6 to 16 years old) performed a new, computerized Virtual Radial Fitts Task (VRFT) to determine their MI ability as well as the age‐related confluence between performance in executed and imagined movement conditions. Participants aimed at five targets, which were positioned along radial axes from a central target circle. The targets differed in width (2.5, 5, 10, 20 or 40 mm), resulting in an index of difficulty (ID) that varied from 6.9 to 2.9 bits. Performance was indexed by the linear relationship between ID and Movement Time (MT). The findings showed that executed task performance was slower than imagined performance. Moreover, conformance to Fitts’ Law during executed movement performance was obtained from a very young age. Most importantly, correlations between imagined and executed movements were low in the young participants but gradually increased across age. These age‐related changes in MI are hypothesized to reflect the children's emerging ability to represent internal models for prospective actions, consistent with the gradual unfolding of feedforward control processes.     

Modeling continuity and discontinuity in utterance length: a quantitative approach to changes, transitions and intra-individual variability in early grammatical development

The confluence of an anomaly such as a growth spurt or a temporary regression on the one hand and a temporary increase in intra-individual variability on the other hand, forms a strong indicator of a major transition in early language development. Data concern one-word (W1), two- and three-word (W2-3), and four-and-more-word (W4+) utterances from two French children during their second and third years. A dynamic growth model was fitted, based on a structure of supportive, conditional and competitive relationships. Using a statistical simulation method, we showed two striking peaks of variability in addition to a temporary regression or rapid growth in the proportions of W1, W2-3 and W4+ utterances. We argue that these phenomena show transitions corresponding to critical points in grammatical development, which could be indicative of the emergence of simple combinatorial and syntactic stages of language successively. Our results emphasize the relevance of time-serial data and of intra-individual variability in the study of developmental transitions in general.     

Understanding the role of hope in counselling: Exploring the intentional uses of hope

In this paper we look at various conceptual models of hope and research evidence for the integral role that hope plays in counselling. We recognize hope as a dynamic process during which counsellor and client interact in ways that can be mutually influencing and we review research that explores this reciprocal process. A model for the intentional use of hope in counselling that recognizes both implicit and explicit approaches is offered. Metaphors for hope-work that position and re-position both counsellor and client in ways that may foster hope are explored. Finally, we provide suggestions for initiating conversations in which hope can be an explicit therapeutic focus.