Failure to block control by a relevant stimulus

Pigeons were trained to depress a treadle in the presence of a discriminative stimulus, either a tone or illumination of red houselights, in order to obtain access to grain or avoid electric shock. In avoidance training, the auditory discriminative stimulus yielded faster acquisition than did the visual one. In appetitive training, the visual discriminative stimulus yielded faster acquisition than the auditory one. Experiments 2 and 3 used these stimuli in Kamin’s (1969) blocking design. In Experiment 2, when the pigeons were trained to depress a treadle in the presence of tone to obtain grain and then red light was added as the redundant stimulus, the light acquired stimulus control over treadlepressing; blocking was not observed. In Experiment 3, when the pigeons were trained to depress a treadle in the presence of red light to avoid electric shock and then tone was added as the redundant stimulus, the tone acquired stimulus control over treadle-pressing. Again, blocking was not observed. The implications of these results for several models of stimulus control are discussed.     

Children's school problems and family system processes

The literature concerning the relationship between children's school problems and family system processes is reviewed. While it is noted that there is no strong linkage between the empirical studies and case reports that have appeared to date, it is observed that the findings from these studies are showing some convergence. There is now reasonable evidence that some school problems may indeed be a consequence of family system processes. The fact of this possibility and the character of the relationship is brought to the attention of school counselors and school psychologists.     

Research abstracts

Abstracts compiled by Nancy R. Preston, ERIC Clearinghouse on Information Resources, Syracuse University, Syracuse, NY, 13244-2340     

An evaluation of outcomes following the replacement of traditional histology laboratories with self‐study modules

Changes in medical school curricula often require educators to develop teaching strategies that decrease contact hours while maintaining effective pedagogical methods. When faced with this challenge, faculty at the University of Cincinnati College of Medicine converted the majority of in‐person histology laboratory sessions to self‐study modules that utilize multiple audiovisual modalities and a virtual microscope platform. Outcomes related to this shift were investigated through performance on in‐house examinations, results of the United States Medical Licensing Examination^® (USMLE^®) Step 1 Examination, and student feedback. Medical School College Admissions Test^® (MCAT^®) scores were used as a covariate when comparing in‐house examinations. Results revealed no significant change in performance on in‐house examinations when the content being assessed was controlled (F(2, 506) = 0.676, P = 0.51). A significant improvement in overall practical examination grade averages was associated with the self‐study modules (F(6, 1164) = 10.213, P < 0.01), but gradual changes in examination content may explain this finding. The histology and cell biology portion of USMLE Step 1 Examination remained consistent throughout the time period that was investigated. Student feedback regarding the self‐study modules was positive and suggested that features such as instructor narrated videos were an important component of the self‐study modules because they helped recreate the experience of in‐person laboratory sessions. Positive outcomes from the student perspective and no drop in examination performance suggests that utilizing self‐study modules for histology laboratory content may be an option for educators faced with the challenge of reducing contact hours without eliminating content. Anat Sci Educ 10: 276–285. © 2016 American Association of Anatomists.     

Anticipatory contrast as a measure of time horizons in the rat: Some methodological determinants

In three experiments, the time horizon over which the rat evaluates alternative feeding sources was investigated. The time horizon was measured by the suppression of intake of one incentive (a 0.15% saccharin solution) when a preferred alternative incentive (a 32% sucrose solution) was available but delayed. In Experiment 1, we found a direct function between the amount of saccharin intake and the delay time before access to 32% sucrose. Compared with intake for a saccharin-only control, saccharin intake was suppressed before 4-min and 16-min sucrose delays, but not before a 32-min delay. Because previous work (Flaherty & Checke, 1982) had reported suppression before a delay of nearly 32 min, in the subsequent experiments we examined factors that might account for this difference. In Experiment 2, we found that saccharin intake was suppressed before a 32-min delay interval when saccharin and sucrose solutions were presented in a bright-novel test environment but not when the same solutions were presented in the home cage. In Experiment 3, we found that the time between testing and subsequent postsession feeding could also affect the suppression of saccharin intake. Saccharin intake was suppressed when access to 32% sucrose was delayed by 32 min and the test situation was followed by immediate postsession feeding, but not when postsession feeding was delayed by 90 min. These results thus extend estimates of the rat’s time horizon to at least 32 min, but indicate that the effective time horizon can vary, depending on the test situation.     

Evolving journal costs: implications for publishers,libraries, and readers

In this article, we summarize the cost implications of print and electronic publishing for scientific scholarly journal publishers, libraries, and scientists. In each case, we developed detailed cost models to demonstrate the importance of factors that affect publishing and decisions made by libraries and scientists to determine whether to subscribe to a journal; if so, in print or electronic medium, and, if not, what alternative information sources to use. In all instances, estimates of unit cost are essential for understanding the dynamics of the economic and systemic interdependencies of publishers, libraries, and readers.     

Encouraging Professional Reflection in Early Education

This article examines the use of the Repertory Grid technique derived from personal construct theory as a tool to aid the reflection of teachers and other professional working in Early Education. The main focus of the article is a study of the constructs used to describe children, elicited at the start and again at the end of a module ‘Children's Development and Learning’, which formed part of a continuing professional development postgraduate award in Early Education. Completed grids provided a focus for reflective written commentary and informal group discussion by practitioners. Additional information was obtained by interviews with practitioners after the module had been completed. The approach was evaluated by quantitative and qualitative analysis of the participants' grids using the Rep Grid 2 package and by evaluation of the end of module interviews. The potential of the personal construct approach for supporting professional reflection in general and its particular application in Early Education is then explored.