Comparing Models of Change to Estimate the Mediated Effect in the Pretest–Posttest Control Group Design

Models to assess mediation in the pretest–posttest control group design are understudied in the behavioral sciences even though it is the design of choice for evaluating experimental manipulations. The article provides analytical comparisons of the four most commonly used models to estimate the mediated effect in this design: analysis of covariance (ANCOVA), difference score, residualized change score, and cross-sectional model. Each of these models is fitted using a latent change score specification and a simulation study assessed bias, Type I error, power, and confidence interval coverage of the four models. All but the ANCOVA model make stringent assumptions about the stability and cross-lagged relations of the mediator and outcome that might not be plausible in real-world applications. When these assumptions do not hold, Type I error and statistical power results suggest that only the ANCOVA model has good performance. The four models are applied to an empirical example.     

Teaching Psychobiology at a Distance

Psychobiology is an area of knowledge that deals with the biological basis of behaviour. Its concretion as a specific area of study originates in the confluence and development of other areas such as physiological psychology, experimental and comparative psychology, ethology, biology and the neurosciences. For some, psychobiology would be that part of the neurosciences that deals with the study of the processes of emotion, motivation, cognition and learning. Others are of the opinion that it covers a much wider area, and that its objective is rooted in the study of all biological mechanisms that govern behaviour — and these, undertaken from a philogenetic and ontogenetic perspective.

In the last decade, we have witnessed the creation of psychobiology departments throughout the world. These departments participate in the teaching of faculties of medicine, psychology, biology and zoology. In some universities, these departments even contribute to the teaching imparted by the faculties of philosophy and educational sciences. Sooner or later, the universities teaching at a distance had to consider the creation of departments of psychobiology to attend to the up‐dating of the curriculum of diversive faculties.

In the National University of Education at a Distance, U.N.E.D. (Madrid, Spain) the teaching of psychobiology is entrusted to a department of the same name which started during the academic year of 1982–83. Even though the experience is very short to be able to advance a complete evaluation, the difficulties encountered in the organization of the form and content of different courses imparted by the department of psychobiology (D.P.) could be useful to the reader. Therefore, these difficulties must be understood within the educational model of teaching at a distance at U.N.E.D.     

Comprehension evaluation and regulation in learning from science texts

Metacognitive variables influence students' learning from science texts. This article deals with the comprehension monitoring abilities of secondary school science students, one of the areas of metacognition which has drawn considerable attention from researchers. The aims of the study are, in particular: (a) to know the extent to which comprehension is monitored by secondary science students as revealed by inconsistency detection in manipulated science texts, and (b) to identify the strategies used to regulate comprehension by the students who detect the inconsistencies. The results indicate that knowing that one understands or fails to understand science texts could be as important a problem as understanding proper. Besides, some incorrect regulatory strategies used by students who notice the inconsistencies in the texts are identified. These could also have an annoying influence in the regulatory behavior of students when studying regular science texts.     

Effects of blood flow restriction without additional exercise on strength reductions and muscular atrophy following immobilization:A systematic review

Purpose:To investigate whether blood flow restriction(BFR) without concomitant exercise mitigated strength reduction and atrophy of thigh muscles in subjects under immobilization for lower limbs.Methods:The following databases were searched:PubMed,CINAHL,PEDro,Web of Science,Central,and Scopus.Results:The search identified 3 eligible studies,and the total sample in the identified studies consisted of 38 participants.Isokinetic and isometric torque of the knee flexors and extensors was examined in 2 studies.Cross-sectional area of thigh muscles was evaluated in 1 study,and thigh girth was measured in 2 studies.The BFR protocol was 5 sets of 5 min of occlusion and 3 min of free flow,twice daily for approximately 2 weeks.As a whole,the included studies indicate that BFR without exercise is able to minimize strength reduction and muscular atrophy after immobilization.It is crucial to emphasize,however,that the included studies showed a high risk of bias,especially regarding allocation concealment,blinding of outcome assessment,intention-to-treat analyses,and group similarity at baseline.Conclusion:Although potentially useful,the high risk of bias presented by original stodies limits the indication of BFR without concomitant exercise as an effective countermeasure against strength reduction and atrophy mediated by immobilization.     

Bilingualism and the gifted intellect

Teaching young gifted children a second language enriches their ability for linguistic expression.     

VOTERS AND CITIZENS IN A NEW DEMOCRACY: SOME TREND DATA ON POLITICAL ATTITUDES IN SPAIN

General Franco's death in 1975 saw the end of a long dictatorshipand the beginning of political changes of extraordinary importance.This article examines the most outstanding political attitudesof the Spanish people during the processes of transition anddemocratic consolidation. Using survey data from different sources,the authors try to trace the patterns of continuity and changewhich arise from the political indicators selected. The findingsreveal moderate, reformist and supportive attitudes towardsdemocratic principles. These attitudes are compatible with perceptionsof political mistrust and inefficacy, and with limited politicalparticipation.