The prevention of chronic pain and disability: a preliminary investigation.

A preliminary investigation was undertaken on 117 acute back pain cases, to assess the utility of counseling at the acute stage upon the course of recovery over the subsequent 6 months. In addition, the extent to which psychological reactions to acute injury would allow the 'tagging' of individuals at risk for chronic pain problems, was studied. The minimal rehabilitation counseling proved inadequate to effect the course of recovery, but remarkably accurate predictions were possible at the sub-chronic point (3 months) as to who would make complete recoveries.     

Irrelevance of sample stimuli and directed forgetting in pigeons

A successive matching procedure was used to investigate which aspect of the test-omission procedure is responsible for establishing a postsample stimulus as a cue to forget in pigeons. It was found that a postsample stimulus that reliably followed a sample that was irrelevant to performance functioned as a cue to forget. This result was obtained regardless of whether termination of that postsample stimulus was followed by reinforcement or by the presentation of sample-independent discriminative stimuli. It was also found that a postsample stimulus that functioned as a cue to forget at the beginning of training lost that function when it was repeatedly presented on trials in which the sample was relevant to performance. These findings reveal that (a) neither a reduction in reinforcement rate nor the omission of the opportunity for discriminated responding is necessary to establish an effective cue to forget and (b) irrelevance of the sample to performance is a sufficient condition to establish a cue to forget. These results suggest that a postsample stimulus that is presented on trials in which remembering the sample is not reinforced differentially will come to set the occasion for not remembering the sample.     

Language,social ecology and experience

Experience is structured by thoughts which are composed of general concepts and conceptions of objects. Both of these elements of thought are rule‐governed and rest on norms which are shared by thinkers. Concepts and conceptions of objects as the elements of thoughts whose content is essentially communicable plausibly rest on abilities tied to the use of linguistic terms. This suggests that language plays an active part in structuring human experience and cognition as suggested by both Vygotsky and Luria. The role of language in thought implies that the human brain which is the information processing structure realizing thoughts is itself subject to shaping by the social milieu. Neural network theory suggests that this might proceed via the use of cue stimuli based on the responses of other human beings and, therefore, supports the view that cognitive neuroscience may be radically mistaken in thinking that it can provide an individualistic analysis of human mental life.     

Stimulus control of information processing in pigeon short-term memory

Six pigeons were trained initially on a delayed successive matching-to-sample task using red and green fields as sample and test stimuli. Following acquisition, each sample was followed either by a vertical line (“remember” cue), which indicated that sample memory would be tested, or by a horizontal line (“forget” cue), which indicated that sample memory would not be tested. During the experiments, sample memory on forget trials was tested occasionally. A series of five experiments revealed: (a) better retention on remember trials than on forget trials, (b) increased effectiveness of a forget cue when it followed closely sample offset, (c) more rapid forgetting over a retention interval ranging from 3 to 6 sec on forget trials than on remember trials, (d) a “cancellation” effect in which a remember cue which followed immediately the offset of a forget cue attenuated markedly the effectiveness of the forget cue, and (e) an “insulation” effect in which the effectiveness of a forget cue was reduced considerably when presented after a remember cue. It was concluded that pigeons actively process or rehearse the sample memory during the retention interval.     

Natural rates of teacher approval and disapproval in grade-7 classrooms

The natural rates of teacher verbal approval and disapproval in ten grade-seven classrooms were determined and compared with those described by White (1975). Although there were differences in the observation techniques used and the behavioral, cultural, and ethnic groups sampled, the results were similar. The majority of the teachers displayed individual rates of disapproval that were higher than their individual approval rates. The correlations between levels of on-task behavior and approval and disapproval rates were low. The issues raised by these findings are discussed in terms of directions for further research.     

Crisis intervention and the prevention of institutionalization: An interrupted time series analysis

In the context of the community mental health movement in Illinois, the evolution and development of a crisis intervention program aimed at avoiding state hospitalization and bringing more appropriate and efficacious resources to bear on the difficulties of the individual and/or family is described. This intervention program is characterized by a more active-seeking style of delivering mental health services. With the novel application of interrupted time series analysis to both the targeted and matched nonequivalent control communities the efficacy of this more active intervention in reducing the number of state hospital administrations diagnosed as "mentally ill" is highlighted. The cost/benefit to the taxpayer is also discussed.     

FIT: An iterative parameter-estimation function in LISP

A nested parameter-estimation program (FIT), written in LISP, is described. FIT searches an n-dimensional parameter space for the set of parameter values associated with either a minimum or a maximum criterion score. The range of the parameters is cut in half on each iteration. Two versions of FIT, one suitable for use on large, mainframe systems and the other designed for small microprocessors, appear in the appendices.     

Contending coalitions in agricultural research and development: Challenges for planning and management

There is a gap between the methods and techniques discussed in planning and management literature, and practitioners’ experiences of agricultural research and extension. This gap is attributable to the fact that outcomes of research and extension (R&E) initiatives are shaped by the interactions of contending coalitions that form around issues or approaches and promote or oppose them. This framework is used to elucidate the development of technologies and methodologies in the past. Implications are drawn for future planning and management, based on seeing the use of methods and techniques in terms of the broader social and political contexts of research and development. This article was prepared for the international evaluation conference:Evaluation for a New Century: A Global Perspective. 1–5 November, 1995, Vancouver, Canada. Sponsored by the Canadian Evaluation Association and the American Evaluation Association.     

Prospective versus retrospective coding of samples of stimuli,responses, and reinforcers in delayed matching with pigeons

Pigeons' performance with samples of stimuli (red and green), number of responses (1 and 20), and reinforcers (food and no food) was assessed in a matching-to-sample preparation. Samples of red, 20 responses, and food were each associated with the red comparison stimulus; samples of green, 1 response, and no food were each associated with the green comparison stimulus. Interest focused on whether physically different samples associated with the same comparison stimulus each establish a unique memorial representation embodying the physical attributes of the sample (retrospective coding), or whether they activate a unitary memorial representation embodying an instruction for test responding (prospective coding). In the first experiment, accuracy of choice responding was independent of whether successive sample presentations within a trial involved the same physical sample or physically different but associatively identical samples. A second experiment revealed that, in contrast to other matching preparations, accuracy was not reduced when sample elements were compounded during presentation. It was concluded that physically different samples which are associated with the same comparison stimulus are coded prospectively in terms of an instruction for choice responding.