The effects of extinction,noncontingent reinforcement and differential reinforcement of other behavior as control procedures

Several techniques have been used in applied research as controls for the introduction of a reinforcement contingency, including extinction, noncontingent reinforcement (NCR), and differential reinforcement of other behavior (DRO). Little research, however, has examined the relative strengths and limitations of these "reversal" controls. We compared the effects of extinction with those of NCR and DRO in both multi-element and reversal designs, with respect to (a) rate and amount of response decrement, (b) rate of response recovery following reintroduction of reinforcement, and (c) any positive or negative side effects associated with transitions. Results indicated that extinction generally produced the most consistent and rapid reversal effects, with few observed negative side effects.     

Functional analysis and treatment of self-injurious behavior in young children a summary of 30 cases

The assessment and treatment of self-injurious behavior (SIB) has received much attention in the literature; however, few studies have focused on early intervention for this behavior. In the current study, functional analyses with developmentally appropriate modifications were conducted in an outpatient clinic with 30 children (aged 10 months to 4 years 11 months) to assess SIB and problem behavior in its early stages. The reported mean age of SIB onset was 17 months, and head banging was the most prevalent topography. Functional analyses identified sources of reinforcement for SIB in 62.1% of cases; with the inclusion of all forms of problem behavior, sources of reinforcement were identified for 87.5% of cases. Function-based treatments were developed for 24 cases, with functional communication training prescribed most often (70.8% of cases). Implications of these findings for the development of early intervention programs for SIB are discussed.     

Knowing in advance: the impact of prior event information on memory and event knowledge

We examined the influence of newly acquired information on children's memory and general representation of a personally experienced event. Thirty-five children between the ages of 5 and 7 years participated in the novel event (Visiting the Pirate). The day before participating, children were: (1) provided with new information specific to the up-coming event; (2) engaged in a discussion generally related to the event topic based on existing knowledge; or (3) discussed an unrelated topic. Advance information specific to the event led to better recall and, in particular, to better integration of the experience into a general event representation both soon after the event and at a follow-up interview 4 months later, whereas general discussion of the topic without the event specific information neither enhanced memory reports nor facilitated the integration of event information. Providing information in advance can have significant effects on memory and knowledge acquisition although many variables, including those relating to the specific content of the information, will affect this relation.     

Age constraints on first versus second language acquisition: evidence for linguistic plasticity and epigenesis

Does age constrain the outcome of all language acquisition equally regardless of whether the language is a first or second one? To test this hypothesis, the English grammatical abilities of deaf and hearing adults who either did or did not have linguistic experience (spoken or signed) during early childhood were investigated with two tasks, timed grammatical judgement and untimed sentence to picture matching. Findings showed that adults who acquired a language in early life performed at near-native levels on a second language regardless of whether they were hearing or deaf or whether the early language was spoken or signed. By contrast, deaf adults who experienced little or no accessible language in early life performed poorly. These results indicate that the onset of language acquisition in early human development dramatically alters the capacity to learn language throughout life, independent of the sensory-motor form of the early experience.     

Modeling unipolar depression as a chaotic process

This study inspected the deterministic structure of unipolar depression. Two women self-monitored sadness hourly 10 times a day for 6 months. One woman had a recurrent history of unipolar depression, and the other did not. Data were analyzed by visual inspection, examination of the Fourier transforms of the time plots, and the correlation dimension. Results suggested that in addition to a strong periodic component that existed only within the depressed subject's mood time series, a low-dimensional chaotic process might have been operating. In the nondepressed control subject, no such periodicity or process could be identified. The findings support maladaptive deterministic theories of mood disorders and have implications for the assessment of unipolar depression.     

I don't think that's what really happened: the effect of cross-examination on the accuracy of children's reports

In the courtroom, child witnesses must undergo cross-examination. Prior research has shown that children change their original testimony under cross-examination, but the effect of these changes on the accuracy of children's testimony is unknown. The authors examined the effect of cross-examination on the accuracy of 5- and 6-year-old children's (N=46) reports of a contrived event. Consistent with prior research, children made changes to their original responses during cross-examination. Furthermore, these changes occurred irrespective of original accuracy. Finally, prior exposure to misleading information did not affect children's responses to cross-examination. Even children with no prior exposure to misinformation altered their original responses, decreasing their ultimate levels of accuracy. These findings demonstrate that cross-examination style questioning is inappropriate for young children.     

A Question of Two Answers: Difference and Determination in Barth and von Balthasar

This essay uses the motif of 'the woman as answer' in Barth and von Balthasar to explore aspects of their accounts of sexual difference in relation to ontological and trinitarian difference. In both cases the motif is shown to be problematic for reasons which become apparent in christology. Barth's characterisation of woman as the 'sufficient answer' to the prior 'question' posed by man indicates a tendency towards the elision of difference in his anthropology, which is reflected in the nonsexuality of Christ - the 'true Man' Ð and in aspects of his trinitarian theology. Von Balthasar's 'double answer' of woman to man moves beyond viewing sexual difference as the locus of man's self-completion, but the overdetermination of 'woman' in his mariology undermines this. The pneumatology of von Balthasar's 'Spiritus Creator' suggests possibilities for the development of a christologically-focused anthropology which maintains difference.     

Quality of Life and Neurological Illness: A Review of the Literature

This article highlights some of the conceptual and methodological problems associated with quality of life (QoL) measurement in individuals with neurological illness. It is suggested that these problems have contributed to the underdeveloped status of QoL research in neurological settings. Many of the existing QoL measures that have been used, or show potential for use with individuals with neurological illness, are reviewed in terms of their theoretical basis, content, and practicality. A large proportion of these measures fail to meet adequate psychometric standards and/or have rarely been psychometrically tested. The confusion that surrounds adequate psychometric standards is discussed, and the dynamic nature of QoL is highlighted as a factor that requires further attention. Research addressing the discrepancies between proxy and patient ratings of patient QoL is also warranted. More focused research in these areas may contribute to a clearer understanding of how to assess QoL in individuals with neurological illness.     

Evaluation of agricultural research in Latin America and the Caribbean

This article assesses the state of evaluation, and identifies priorities for improving evaluation, in agricultural research organizations in the region of Latin America and the Caribbean in the early 1990s. Based on thirteen case studies conducted in 1992, the article describes the institutional settings and regional patterns, and trends in evaluation practice. Illustrative cases from Argentina, Brazil, and Guatemala are presented. The organizations studied have extensive experience with evaluation; however, this experience has not been well documented or shared. Evaluation is generally the weakest phase in the management cycle. In the past, most evaluations have been extrinsically motivated, and as such, they have been of little use to local researchers and managers. Obstacles to improving evaluation include the centralization of administrative systems, weak program management, a lack of understanding of potential uses of evaluation in management, and limited knowledge of appropriate evaluation methods. Agricultural research managers feel that evaluation training should be provided as one component of a broader effort covering planning, monitoring, and evaluation. Since joining ISNAR in 1990, he has engaged in research, training, and advisory work on research management, with an emphasis on evaluation. Previously, for fifteen years Horton was head of the social science department of the International Potato Center in Peru. Horton received B.s. and M.S. degrees in agricultural economics from the University of Illinois and a Ph.D. in economics from Cornell University. His current interests include action research and learning, organizational assessment, and institutionalization of planning, monitoring, and evaluation. He worked for fourteen years at the Brazilian Corporation for Agricultural Research, conducting research and development activities in the areas of human resources and of strategic management. He is a full professor at the Department of Social and Work Psychology, Institute of Psychology, University of Brasilia, Brazil, where he teaches and advises at the undergraduate and graduate levels and does research and consulting. His current areas of interest are organizational behavior, training, organizational evaluation, and science and technology management.