Short-term retention of “surprising” events following different training conditions

Terry and Wagner (1975) have suggested that short-term retention of information about an event is enhanced if the occurrence of the event is surprising. To investigate this idea, we trained two groups of pigeons in a preparatory-releaser procedure in which half the trials started with the presentation of food (the preparatory event). The preparatory food presensation was signaled by an 8-sec white keylight in the signaled, but not in the unsignaled, group. After a retention interval, varying between 2 and 32 sec, the releaser stimulus (CS_R), a red keylight, was presented for 8 sec in the absence of any reinforcement. The remaining trials were initiated by the presentation of CS_R, and the first peck occurring 8 sec after the onset of CS_R was reinforced by food. The preparatory event controlled responding to CS_R at the short retention interval, with the level of control declining systematically with increasing retention intervals. On probe test trials, the presentation of the preparatory food event was preceded by a stimulus that had previously been paired (CS+) or unpaired with food (CS?). Discriminative responding to CSr was better following CS? than following CS+ in the unsignaled, but not the signaled, group. These results suggest that the enhanced retention following surprising preparatory events reflects a generalization decrement induced by changing the signaling conditions between training and testing.     

Second year teacher candidates reflect on information technology in ontario secondary schools: how it is being used and the challenges it presents

Abstract

This article documents observations of pre-service teachers about how both students and teachers are using information technology in 374 secondary classrooms in Ontario, Canada. Also reported are some of the challenges that have resulted since the advent of this technology in these schools. The findings have direct implications for teacher education. Not only must teacher candidates learn how to use and apply this new technology, but they must be made aware of other issues (such as classroom management issues) stemming from the integration of information technology in the classroom. Teacher education programs must remain current: one way of doing this is to investigate ongoing classroom practices and issues. This article helps to identify both     

#5: Non-Supine (e.g., Upright or Side-Lying) Positions for Birth

In this position paper—one of six care practice papers published by Lamaze International and reprinted here with permission—the benefit of non-supine positions for birth is discussed and presented as an evidence-based practice that helps promote, protect, and support normal birth. The paper is written for childbearing women and their families. Upright and gravity-neutral positions facilitate rotation and descent of the baby and result in reduced duration of second stage, a reduction in episiotomies, and fewer abnormal fetal heart rate patterns. The accompanying commentary—written by a leading proponent of maternity care—supports these benefits. Lamaze International recommends that laboring women not push until they feel an urge to do so, and that they choose positions for birth that are most comfortable for them.     

Developing and Validating a Novel Anonymous Method for Matching Longitudinal School-Based Data

Prospective longitudinal data collection is an important way for researchers and evaluators to assess change. In school-based settings, for low-risk and/or likely-beneficial interventions or surveys, data quality and ethical standards are both arguably stronger when using a waiver of parental consent—but doing so often requires the use of anonymous data collection methods. The standard solution to this problem has been the use of a self-generated identification code. However, such codes often incorporate personalized elements (e.g., birth month, middle initial) that, even when meeting the technical standard for anonymity, may raise concerns among both youth participants and their parents, potentially altering willingness to participate, response quality, or generating outrage. There may be value, therefore, in developing a self-generated identification code and matching approach that not only is technically anonymous but also appears anonymous to a research-naive individual. This article provides a proof of concept for a novel matching approach for school-based longitudinal data collection that potentially accomplishes this goal.     

Strategic Developments in Open and Distance Learning in Central and Eastern Europe

This article provides a synopsis of the findings of a strategic study on developments in open and distance learning in Central and Eastern Europe. The study was undertaken during 1999 under the aegis of the PHARE Multi-country Programme in Distance Education. The aim of this article is to provide an overview of the issues addressed by the study. These include contextual issues relating to the development of open and distance learning and the changing nature of higher education, an exploration of developments across Europe and the problems associated with those developments, and a discussion of possible solutions to those problems in Central and Eastern Europe with particular reference to legislation, quality assurance and recognition, and strategic management.     

Signaling the omission of a response-contingent outcome reduces discriminative control

The effect of training a positive discriminative stimulus (S+ ) as a signal for the nonreinforcement of an instrumental response (S?) on the ability of that stimulus to evoke its original instrumental response was examined in three experiments using rats. In all three experiments, two different stimuli were established as S+s for different response-outcome relations. In Experiment 1, an S+ was less effective in controlling its original response after it had undergone training as an S? for a new response that earned the same outcome than it was after training as an S? for a response that earned a different outcome. Experiment 2 established that this effect was not mediated by Pavlovian inhibitory conditioning produced by the negative correlation between the S+ and the outcome during S? training. Simply arranging a negative correlation between S+ and the outcome whose occurrence it had previously signaled did not impair the ability of that S+ to elicit its original response. In Experiment 3, the response-evoking properties of an S+ were found to be undermined by using the S+ as a signal for the simple extinction of a new response trained with the same outcome, but not with a different outcome. These results suggest that positive discriminative stimuli use their associations with the outcomes earned in their presence to control the responses that earned those outcomes.