Performance asymmetries and coupling dynamics in the acquisition of multifrequency bimanual coordination

Sixteen right-handed participants without formal musical training performed a rhythmic multifrequency coordination task for several hours over a one-week period. Two groups were studied with respect to the assignment of hand to frequency: 1L:2R, in which the preferred right hand performed the higher frequency, and 2L:1R in which the non-preferred left hand performed the higher frequency. Performance asymmetries in terms of relative phase stability were initially expected and confirmed. The 1L:2R pattern was more stable than 2L:1R. It has been suggested that performance asymmetries result from asymmetrical coupling between the limbs as influenced by handedness. This study examined whether the acquisition of 2L:1R, the less stable of the two patterns, required the formation of asymmetrical coupling such that the faster hand would exert a greater forcing on the slower hand than vice versa, a supposition put forth in many studies of bimanual polyrhythmic tapping. The present data provide quantitative evidence that, in terms of stability (as quantified by relative phase uniformity, transition pathways, and lead-lag relations), handedness asymmetries, as well as acquired asymmetries, can be captured by low-dimensional dynamics consisting of symmetric and asymmetric coupling terms. Received: 18 November 1996 / Accepted: 6 May 1997     

The Grouping Process Across Cultural Change

Based on their extensive experience working with individuals, families, groups and organizations in Greece, the authors describe therapeutic techniques for helping individuals understand and work through the acculturation process. Tasks and procedures employed at various social levels--dyads, triads, small groups of four to six members, and large groups of 18-25--are catalysts for the exploration and clarification of the ways in which old norms and roles are being modified, weakened, or distorted by cultural change, and for the redefinition of values and expectations.     

Prime time advertisements: Repetition priming from faces seen on subject recruitment posters

Repetition priming is defined as a gain in item recognition after previous exposure. Repetition priming of face recognition has been shown to last for several months, despite contamination by everyday exposure to both experimental and control faces in the interval. Here we show that gains in face recognition in the laboratory are found from faces initially seen in a rather different context— on subject recruitment posters, even when the advertisements make no specific mention of experiments involving face recognition. The priming was greatest when identical pictures were shown in the posters and in the test phase, although different views of faces did give significant priming in one study. Follow-up studies revealed poor explicit memory for the faces shown on the posters. The results of these experiments are used to develop a model in which repetition priming reflects the process of updating representations of familiar faces.     

The Influence of Social Context on Requests in Young Iranian Children

This study concerns the influence of social contexts on young children's communication. The aim was to show that, at a very young age, children take into account the conversational context and certain conventions governing social relations. Iranian children's request behaviours were analyzed in three situations: (a) the adult immediately complies (satisfaction), (b) the adult asks a clarification question (clarification), and (c) the adult refuses to comply (refusal). Two groups of 12 children aged 18 and 30 months were observed in day-care centres during dyadic interaction with an Iranian adult. The verbal and nonverbal productions of the two groups were considered. The results showed that the children modified their behaviours in accordance with the adult's attitude. Comparison with a study conducted in France suggests that reformulations in the clarification situation are similar in the two cultures. The intercultural differences observed concern both overall request production and the characteristics of reformulations in the refusal situation. These specificities reflect the early influence of cultural values concerning the difference between the social status of children and adults.     

Case study: Research with brain-dead children

The esophageal obturator airway (EOA) is a device used throughout the United States to facilitate artificial respiration of critically ill patients who are not hospitalized. Its use is restricted to persons who are over 15 years old because obturators for children are not available. A protocol submitted to an institutional review board (IRB) intended to develop EOAs suitable for use in children. The investigators proposed to perform preliminary testing of these devices on children who had sustained irreversible loss of brain function (“brain death”). In its review of this protocol, the IRB had to confront several vexing questions.     

Positive killing and the irreversibly unconscious patient

Various arguments have been given against positive euthanasia, but little attention has been given to the question of whether these arguments are uniformly effective in all contexts. There appears to be a range of cases, involving non-voluntary killing of irreversibly unconscious patients, in which these arguments do not succeed. Various reasons have been given in support of positive killing in such cases. It can be argued that there is a range of cases for which a policy of allowing positive killing is morally required. However, currently there are legal obstacles to implementing such a policy.     

Swedish primary school pupils' inter-ethnic relationships

The aim of the Swedish educational policy is educional participation and academic achievement for all children, irrespective of ethnic backgroud. Majority lauguage instruction is an imortant tool used to achieve this goal. We argue that taking lessons in Swedish-as-a-second-lanuage (S2) sets children apart in their class and limits their possibilities to interact with Swedish children and the immigrant children, who do not receive S2-lessons. In accordance with the contact hypothesis, we assumed that this limitation would have a negative impact on peer evaluation of these pupils' social competence. 394 children in ethnically mixed classes (grades 4–6) participated in the study reported in this article. As hypothesized, S2-children's sociability was evaluated significantly lower than that of Swedish children. Immigrant children, who do not have S-2 lessons, do not have significantly lower scores. These findings were confirmed, using teachers' evaluations of children's social competence. It is suggested that more research is needed to investigate whether communicative skills, academic competence, or, perhaps, the organizational consequences of extra language lessons play a role in children's assessments of peer social competence.     

From status to contract: a future for mental health law

Given the many complex issues and interests involved it is hardly surprising that mental health is a controversial topic. The law has a critical role in protecting interests and balancing claims. But the law is a major part of the problem. Indeed analysis of its role in producing anti-therapeutic outcomes led to the development of therapeutic jurisprudence. And we keep changing the law; for example on 16 October, 1999 the British Government announced proposals for radical reform of the mental health laws of England and Wales which, in the current form, were heavily influenced by developments in the United States of America. A major problem, it is submitted, is that we do not have an agreed model of the law, upon which to develop an appropriate structure for the delivery of mental health services. Currently we emphasis 'status', which puts a premium upon drawing distinctions which it is difficult, if not unrealistic, to achieve in practice. Another approach would be to emphasize the centrality of the relationship between the patient, or client, and the inter-disciplinary team of people providing him or her with services. This approach, outlined and argued for in this article, would involve developing the law of contract.     

Features of Interview Questions Associated with Attenuation of Symptom Reports

Previous studies have suggested that discrepant reporting in a test–retest reliability paradigm is not purely random measurement error, but partly a function of a systematic tendency to say no during retest to questions answered positively at initial testing (attenuation). To examine features of interview questions that may be associated with attenuation, three raters independently assessed the structural and content features of questions from the Diagnostic Interview Schedule for Children (version 2.3) and linked these to data from a test–retest reliability study of 223 community respondents (parent and child reports). Results indicated that for both parent and youth reports, item features most strongly associated with attenuation were (a) being a stem question (asked of all respondents, regardless of any skip structure); (b) question placement in the first half of the interview; (c) question length; (d) question complexity; or (e) requiring assessment of the timing, duration, or frequency of a symptom. Findings may be explained by participants' conscious efforts to avoid further questions or by their learning more about the nature and purpose of the interview as they gain more experience; alternatively, findings may represent a methodological artifact of structured interview design.     

A comparison of “traditional” and “atypical” workers: Demographic,behavioral, and attitudinal differences

Differences among full-time (n=1066), part-time (n=132), and moonlighting employees (n=153) in a variety of occupations were examined. Moonlighters as compared to full-timers were younger, more frequently male, perceived less educational fit with their main jobs, and were primary wage earners. Full-timers as compared to part-timers were more frequently male, married, and primary wage earners. Part-timers had the greatest turnover, but no differences were detected for other withdrawal behaviors. Part-timers were more satisified with working conditions but were less satisfied with extrinsic rewards and life in general. Moonlighters expressed a stronger work ethic and placed less importance on working conditions.A version of this paper was presented at the 1991 Meetings of the Southwest Division of the Academy of Management in Houston, TX.