Role of proprioceptive information in movement programming and control in 5 to 11-year old children

The role of proprioceptive inputs in the control of goal-directed movements was examined, by means of the tendon vibration technique, in 5 to 11-year old children performing a serial pointing task. Children pointed, with movements of various amplitudes and at various positions, by alternating wrist flexions and extensions. Tendon vibration was applied to both agonist and antagonist muscles to perturb relevant muscular proprioceptive inputs during the static or dynamic phase of the task, i.e., during stops on targets or during movement execution. Constant and variable amplitude errors as well as constant position error were evaluated. Vibratory perturbation applied during movement execution resulted in a similar reduction in movement amplitude, yielding an increased constant error in all age groups and a systematic position error in the direction of the movement starting point. Perturbing proprioception during static phases preceding movement resulted in an age-related increase in the variable amplitude error, which was maximal in 5-year old children performing extension movements. The results were interpreted in terms of the use of proprioceptive information in the feedforward and feedback based components of movement control in children. In particular, the results indicated (1) developmental changes in the relative weighting of each component, (2) an increased capacity to move from one strategy to the other, depending on the availability of information, and (3) developmental changes from an alternated to an integrated control of amplitude and position in serial pointing.     

Outcome measures for clinical drug trials in autism

This paper identifies instruments and measures that may be appropriate for randomized clinical trials in participants with autism spectrum disorders (ASDs). The Clinical Global Impressions scale was recommended for all randomized clinical trials. At this point, however, there is no "perfect" choice of outcome measure for core features of autism, although we will discuss five measures of potential utility. Several communication instruments are recommended, based in part on suitability across the age range. In trials where the intention is to alter core features of ASDs, adaptive behavior scales are also worthy of consideration. Several "behavior complexes" common to ASDs are identified, and instruments are recommended for assessment of these. Given the prevalence of cognitive impairment in ASDs, it is important to assess any cognitive effects, although cognitive data from ASD randomized clinical trials, thus far, are minimal. Guidance from trials in related pharmacologic areas and behavioral pharmacology may be helpful. We recommend routine elicitation of side effects, height and weight, vital signs, and (in the case of antipsychotics) extrapyramidal side-effects assessment. It is often appropriate to include laboratory tests and assessments for continence and sleep pattern.     

A comparison of response cost and differential reinforcement of other behavior to reduce disruptive behavior in a preschool classroom

This study investigated the effectiveness of response cost and differential reinforcement of other behavior (DRO) in reducing the disruptive behaviors of 25 children in a preschool classroom. Using an alternating treatments design, disruptive behavior was reduced when the participants earned tokens for the absence of disruptive behavior (DRO) or lost tokens for the occurrence of disruptive behavior (response cost). Initially, DRO was more successful in reducing the number of disruptive behaviors; however, over time, response cost proved to be more effective.     

Predicting the relative efficacy of three presentation methods for assessing preferences of persons with developmental disabilities

Choices were presented to 9 individuals with developmental disabilities using a two-choice format. Each pair of items, selected based on prior preference assessment, was presented to each participant in three conditions (actual items, pictures of the items, and spoken-name presentation) using a reversal design. The evaluation was conducted using food items, and was then repeated using nonfood items. The participants were also given a test to measure their skills on discrimination tasks ranging in difficulty from simple to conditional discriminations. The participants' abilities to make consistent choices with food and nonfood items were predicted, with 94% accuracy, by their discrimination skills. The findings suggest that presentation methods can affect the accuracy of a choice assessment, and that the systematic assessment of basic discrimination skills can be used to predict the effectiveness of different presentation methods in this population.     

The influence of activity choice on problem behaviors maintained by escape versus attention

This study assessed whether the function of an individual's problem behavior was related to the effectiveness of an intervention involving choice among tasks. Analogue functional analyses were conducted with 7 students with various diagnoses to determine whether problem behaviors were maintained by escape or attention. Following identification of the function of each student's problem behavior, reversal designs were used to assess the effectiveness of an intervention that allowed the students to choose their own instructional tasks. Results showed that students who displayed escape-maintained problem behavior showed substantial reductions in such behavior when they were provided with opportunities to choose among tasks. On the other hand, students who displayed attention-maintained problem behavior did not show any effects as a result of the choice intervention. These findings are discussed in terms of the effective use of behavior management programs involving choice and the reduction of problem behavior.     

Do you see what I see? Testing horses’ ability to recognise real-life objects from 2D computer projections

Animal Cognition - The use of 2-dimensional representations (e.g. photographs or digital images) of real-life physical objects has been an important tool in studies of animal cognition. Horses are...     

The structure ofAND coordinations in children's narratives

Narratives of 3 1/2-to 9 1/2-year-old children were searched for AND coordinations. Only half of the AND utterances of the youngest compared to four-fifths of those of the oldest children were fully formed, syntactically correct coordinations. The latter were classified as phrasal coordinations, redundant sententials (i.e., potential phrasals), or nonredundant sentential coordinations. Sentential coordinations predominated, especially among older children. Direction of redundancy (or potential redundancy) was important: forward forms predominated over backward forms. Differences in form of the children's coordinations often reflected differences in meaning; this was true for backward direction forms of phrasal versus sentential coordination, although not for most forward direction forms.The authors would like to thank Michael Bruce-Lockhart for the development and use of the NARRAN software package. For more information about NARRAN or its availability, write to the first author. This research was supported by National Science and Engineering Research Council grant A-0513 to the first author.     

The Cognitive, Learned-Helplessness and Hopelessness Theories of Depression: A Review with Implications for Counsellors

Four theories of depression and the Attributional Style Questionnaire (ASQ) are described and their implications for counselling discussed. Recent research has focused upon the testing of the diathesis-stress component of the reformulated learned-helplessness theory of depression, and in particular upon the role which a hypothesised depressogenic causal attributional style towards events in general, and/or 'depressive attributions' towards specific events, play in the development of depression. It is suggested that the recently revised version of this theory — the hopelessness theory of depression — is both a more fruitful area of future research and of more interest to the counsellor, since it emphasises the role which attributions and other cognitive factors play in the maintenance and prevention of depression, rather than concentrating on a continued search for a cause.     

Personal Constructs of Students with Eating Disorders: Implications for Counselling

Members of two self-help groupsfor university andpolytechnic students with eating disorders were asked to generale personal constructs. The analysis of the subsequent grids showed that the students were concerned with similar emotional issues. Il also produceda significant difference between ratings of'self and 'ideal self, butfailed to produce evidence of' tight' construing. Discussion ofthe grids made a positive contribution to the self-help process.     

Distributive justice in marriage: Equality or equity?

Experimental studies of distributive justice suggest that men prefer an equity rule for allocating rewards, whereas women prefer equality. These differences are likely to carry implications for distributive justice in the context of marriage. There is a popular view in Western societies that marriage should be regarded as a partnership of equals, and this is also an implicit assumption in microeconomic accounts of the family. However, inequality between spouses is still commonplace, with the husband more likely to have overall financial control and greater access to money for personal spending (PSM). This paper investigates the issue of sharing in marriage, with particular reference to PSM, using data from an in-depth interview study supplemented by some follow-up questionnaires. The participants were 13 women and nine of their partners, mainly ‘middle class’ and aged between 30 and 50. After classifying each couple's system of financial management, the paper focuses upon eight couples with a philosophy of sharing. The findings show that, despite attempts to equalize outcomes for both partners, a sense of ‘ownership’ associated with having earned the money seemed to render it more salient than other, non-financial contributions to the marriage. As a result, patterns of control and personal spending appeared to be based upon equity rather than equality.