Prediction of mathematics achievement: effect of personal, socioeducational and contextual variables

Based upon the self-regulated learning theoretical framework this study examined to what extent students' Math school achievement (fifth to ninth graders from compulsory education) can be explained by different cognitive-motivational, social, educational, and contextual variables. A sample of 571 students (10 to 15 year old) enrolled in the study. Findings suggest that Math achievement can be predicted by self-efficacy in Math, school success and self-regulated learning and that these same variables can be explained by other motivational (ej., achievement goals) and contextual variables (school disruption) stressing this way the main importance of self-regulated learning processes and the role context can play in the promotion of school success. The educational implications of the results to the school levels taken are also discussed in the present paper.     

Forced treadmill exercise prevents oxidative stress and memory deficits following chronic cerebral hypoperfusion in the rat

Physical activity impacts functional recovery following stroke in humans, however its effects in experimental animals submitted to chronic cerebral hypoperfusion have not been investigated. The aim of this study was to evaluate the therapeutic potential of exercise, as assessed by cognitive activity in the Morris water maze and the brain oxidative status, through measurement of macromolecules damage, TBARS levels and total cellular thiols, as well as antioxidant enzymes in hippocampus, striatum and cerebral cortex. Adult male Wistar rats were submitted to the modified permanent bilateral occlusion of the common carotid arteries (2VO) method, with right common carotid artery being first occluded, and tested 3 months after the ischemic event. The effects of three different exercise protocols were examined: pre-ischemia, post-ischemia and pre+post-ischemia. Physical exercise consisted of sessions of 20-min, 3 times per week during 12 weeks (moderate intensity). Rats were submitted to cognitive assessment, in both reference and working spatial memory and after the last testing session were sacrificed to have oxidative stress parameters determined. Hypoperfusion caused a significant cognitive deficit in both spatial water maze tasks and this effect was reversed in rats receiving exercise protocol post and pre+post the ischemic event. Moreover, forced regular treadmill exercise regulated oxidative damage and antioxidant enzyme activity in the hippocampus. These results suggest that physical exercise protects against cognitive and biochemical impairments caused by chronic cerebral hypoperfusion.     

Genetic and adoptive motherhood: Stress,marital relationship,and child care support

In this paper we characterize adoptive and genetic motherhood with or without stress indicators. Participants were 86 mothers (36 adoptive, 50 genetic) with children from 0 to 12 years old. They answered questions about focal child and mother profile, marital relationship, child care support and the Lipp's Stress Symptoms Inventory for Adults. Results showed that mothers in both groups reported child care support, but there was more participation of nonrelatives in the care of adoptive children and relatives in the care of genetic children. There was greater marital stability and less conflict with the arrival of the child in the adoptive families and predominance of stress indicators in genetic mothers. We concluded that, although there are differences between adoptive and genetic motherhood, these do not imply advantages for one versus the other. Moreover, marital stability related to the adoption process and sociodemographic characteristics of adoptive mothers may have contributed to lower prevalence of stress.     

Studying as fun and games: effects on college students' quiz performance

We examined college students' participation in a game activity for studying course material on their subsequent quiz performance. Game conditions were alternated with another activity counterbalanced across two groups of students in a multielement design. Overall, the mean percentage correct on quizzes was higher during the game condition than in the no-game condition.     

Electromechanical delay in ballistic movement of superior limb: comparison between karate athletes and nonathletes

The aim of the study was to analyze electromechanical delay in a ballistic movement of the superior limb. 10 male karate athletes and 9 nonathletes (without karate experience) performed a motor skill as fast and powerfully as possible, with impact on a makiwara (karate training instrument). For each participant, 10 choku-zuki performances were analyzed. Kinematics and surface electromyographic (EMG) activity of the anterior and posterior portions of deltoid, pectoralis major, latissimus dorsi, triceps brachii, and biceps brachii were recorded. Athletes had significantly shorter delay in arm flexion agonist muscles and significantly higher delay in arm flexion antagonist muscles and in forearm extension agonists. Results suggest that enhanced performance in athletes was mainly due to motor learning.     

The role of dark‐side of motivation and intention to continue in exercise: A self‐determination theory approach

Motivation plays an important role when it comes to regular physical exercise. Hence, low levels of intentions to continue exercising in the future may ultimately lead to higher rates of exercise dropout. The first objective of the present research was to test a theoretical model considering the dark side of motivational determinants on intentions towards exercising in the future. The second objective consisted in comparing groups with different characteristics, as a way to identify individuals with weaker intention, which is believed to be an indicator of a higher dropout risk. In total, 544 (294 female; 250 male) gym exercisers aged between 18 and 58 years (M = 35.00; SD = 11.57) partook in the present research. Participants were engaged in fitness group classes (n = 273) or in cardio/resistance workouts (n = 271), and their exercise experience ranged from 3 to 120 months (M = 47.41; SD = 7.54). Results showed that the measurement and the structural model had an excellent fit. In addition, the structural model was invariant between gender, fitness activities, and exercise experience. Each group displayed different explained variance in intention to continue exercising. Overall, male, young adults and more experienced exercisers had stronger intentions towards exercising. Fitness instructors should be aware of their own thwarting behaviors, especially when interacting with female, young and less experienced exercisers, since they have weaker intentions to exercise in the future, possibly representing an increased risk of withdrawal.     

医疗广告影响公众就医行为的心理探析

利用耗散结构理论自组织概念来分析中医对病情的描述、诊断及治疗方法。先用伯纳德(Bénard)涡流概念来说明自组织耗散结构一般性质。再通过一个病案表明自组织概念与中医诊疗手段的一致性。自组织概念为研究中医提供了有力的数学工具。     

An application of bi‐logical theory to the study of psychic change and mourning4

The authors propose that the process of psychic change involves the ‘working through’ of mourning for the loss of ‘theories of life’ that are based on narcissistic omnipotent beliefs. These theories need to be changed by other more realistic ones regarding how to resolve the inherent and natural problems of existence. Questioning the ‘truth’ of these theories of life, as well as the acquisition of the perception of the existence of time, makes up part of the process referred to, and this applies to the analyst in a certain way as much as to the patient. Such problems are lived, re‐edited and revised in the transference/countertransference relationship. The authors present a clinical illustration. They explore the concepts of symmetry, asymmetry, homogenization and differentiation in MatteBlanco's bi‐logical theory and propose that these are important to the comprehension of the dynamic of the psychic changes which occur in a non‐static analytic process.     

A cortical framework for invariant object categorization and recognition

In this paper we present a new model for invariant object categorization and recognition. It is based on explicit multi-scale features: lines, edges and keypoints are extracted from responses of simple, complex and end-stopped cells in cortical area V1, and keypoints are used to construct saliency maps for Focus-of-Attention. The model is a functional but dichotomous one, because keypoints are employed to model the “where” data stream, with dynamic routing of features from V1 to higher areas to obtain translation, rotation and size invariance, whereas lines and edges are employed in the “what” stream for object categorization and recognition. Furthermore, both the “where” and “what” pathways are dynamic in that information at coarse scales is employed first, after which information at progressively finer scales is added in order to refine the processes, i.e., both the dynamic feature routing and the categorization level. The construction of group and object templates, which are thought to be available in the prefrontal cortex with “what” and “where” components in PF46d and PF46v, is also illustrated. The model was tested in the framework of an integrated and biologically plausible architecture.