Effects of duration of feedback on signaled avoidance

Two experiments were carried out to study vertical jumping avoidance learning in rats. In particular, we examined the effects of the duration of a feedback stimulus and of the interval between the end of the feedback stimulus and the start of the next trial on acquisition and extinction of avoidance. In Experiment 1, the duration of feedback was manipulated while intertriai interval (feedback plus no-feedback) was held constant. Animals with feedback lasting more than 1 sec needed fewer trials to reach the acquisition criteria than did animals with no feedback or with 1-sec feedback. No differences were observed in extinction. In Experiment 2, the durations of both feedback and no-feedback were manipulated. Animals without feedback needed more trials to reach the acquisition criterion than did animals with feedback, but the performance of the feedback animals did not differ as a function of feedback duration, no-feedback duration, or total intertrial interval. Again, no differences were observed in extinction. These results indicate that the presentation of feedback improves the acquisition of vertical jumping avoidance, but that this effect is independent of the temporal characteristics of feedback.     

A practical approach to making accurate 3D layouts of interesting cultural heritage sites through digital models

On many occasions, the graphic information handled by people working in the cultural heritage sector is still bidimensional. Layouts showing elevations and cross sections are the most widespread tools. However, there is an increased need for carefully detailing the complexity of valuable sites with an improved accuracy. This implies the measuring and handling of three-dimensional data, using both commercial and turn-key hardware and software solutions. Taking the usual traditional process as a reference, in the present paper a new effective methodology for carrying out computer assisted delineation of layouts from cultural heritage sites, using 3D digital models, is described. The proposed procedure has been tested in five intervention projects on representative churches within the “Merindad de Aguilar de Campoo” medieval area, in the north of Spain.¹ This area has the largest collection of Romanesque art in the world, and is currently under European Heritage Site and World Heritage Site declaration process by the UNESCO.     

Negative instances and the acquisition of the mathematical concepts of commutativity and associativity

The effects of negative instances in the acquisition of the mathematical concepts of commutativity and associativity were examined. Two treatment levels for commutativity (positive instances or positive and negative instances) and the same treatment levels for associativity were crossed to form a 2×2 factorial design with 21 subjects per cell. Subjects were undergraduate elementary education majors. Criterion variables were number of correct responses, stimulus intervals, and postfeedback intervals. Results supported the contention that negative instances enhance concept acquisition but also appear to require more time during treatments. No evidence for a transfer effect for negative instances from one concept to another was found.     

Going the Distance: The Road to the 1984 Olympic Women's Marathon

The 1984 Los Angeles Games hosted, for the first time in Olympic history, a women's marathon race. It took the efforts of several important factions to accomplish the event. First, women runners demonstrated that they were capable of running great distances in increasingly faster times. Second, the popular media publicised those performances, often mitigating athletic commentary with observations about the runners' femininity, attractiveness and relationships with men. Finally, commercial sponsors joined the ranks in this marathon battle to finance important events, running circuits and advocacy groups while simultaneously promoting their own brands of commodity feminism. In the end, it took the coming together of the physical activists, media advocates and corporate champions to accomplish this milestone in sport history.     

The effect of financial constraints, absorptive capacity and complementarities on the adoption of multiple process technologies

This paper investigates the factors affecting the multiple adoption of new process technologies in manufacturing. We focus our attention on the effect of both financial resources and absorptive capacity on the decision to introduce the technology. We argue in favour of a negative effect of financial constraints and provide reasons for a differential effect of internal and external R&D on innovation adoption. Additionally, the methodology allows us to consider the possible complementarities arising when firms adopt several new process technologies. Our results show that financial constraints are dependent on the technology analyzed, whereas only internal R&D investments are strong predictors of adoption. We are also able to present evidence that the three technologies analyzed (numerically controlled machines, computer aided design and robotics) are, to some extent, complementary.     

Legends in Science: from Boom to Bust

In biology and medicine, a scientist’s legend is most commonly determined by their sphere of influence, either on surrounding peers, on clients in the case of medical practitioners, or on the wider scientific public in the case of research scientists. A scientific paper still constitutes the most effective portal through which ideas, knowledge and opinions can be shared among academics and scholars. Thus, legends in science are built upon a scientist’s published literature. Legend was always assumed to be safe in its final form, i.e., a published paper. Yet, a powerful movement of post-publication peer review has begun to identify that not all has been well with the vetting process that led to the publication of a tranche of the scientific literature, and that editorial oversight and weakness has prevailed in a number of cases, leading to retractions and a more critical re-assessment of the literature. One could say that the half-life of a scientific paper has only just begun once it is published. Within this context of science publishing that has given a sense of false security, legends may evolve from boom to bust within the space of weeks or even months. The legendary status of a scientist is therefore no longer safe if there are hidden or undiscovered errors, fraud or misconduct.     

Professional Pathways: a case for measurements in more than one dimension

Recent developments in UK professional education are leading to competence-based National Vocational Qualifications (NVQs) being offered alongside academic awards made within the Credit Accumulation and Transfer (CAT) system. Although dual accreditation of this type may be a welcome development, the NVQ and CAT systems have different philosophies and cannot easily be linked in structural relationships. The context-specific notion of competence represented by NVQs is only one dimension of effective professional practice, as in order to operate intelligently in many of the situations with which they are faced, practitioners increasingly need transcendant abilities of reflection, enquiry and creative synthesis. A solution lies in a coherent approach to professional development and accreditation which is based in a constructivist epistemology and allows these overarching abilities to be recognised through the CAT system independently of NVQ requirements, while enabling students to work towards awards through both systems simultaneously without duplication of effort