Instructional efficiency of different discussion approaches in an outreach laboratory: Teacher-guided versus student-centered     

Marlen Goldschmidt  Franz-Josef Scharfenberg  Franz X. Bogner 《The Journal of educational research》2016,109(1):27-36

Given the rapid development of modern biotechnology, attention to socioscientific issues in educational contexts is crucially important to support students in becoming responsible citizens. The authors' research focused on the impact of discussing socioscientific issues during biology lessons under 3 different treatments (teacher guided, student centered, text only), comparing these treatments with regard to cognitive achievement, cognitive load, and instructional efficiency. The biology lessons were part of an educational intervention with Bavarian 10th-grade students (N = 583) in an out-of-school laboratory on plant genetic engineering. The teacher-guided group performed significantly better regarding knowledge increase, while the cognitive load of the student-centered group was significantly higher. Accordingly, teacher-guided discussion led to the highest instructional efficiency, suggesting an enhanced cognitive achievement through the teacher's guidance. However, a student-centered approach allows students to contribute more of their own opinions, making further research in this area desirable. Finally, we discuss potential implications for teaching and teacher education.  相似文献   

Effekte eines Tanz- und eines Gesundheitssporttrainings auf die graue Hirnsubstanz gesunder Senioren     

Patrick Müller  Kathrin Rehfeld  Angie Lüders  Marlen Schmicker  Anita Hökelmann  Jörn Kaufman  Notger G. Müller 《Sportwissenschaft》2016,46(3):213-222

Due to the demographic change and an aging society more research is nowadays dedicated to geriatric problems and questions. Aging is associated with a loss of grey matter volume in the brain and often leads to neurodegenerative diseases. Physical and cognitive activities have been shown to improve brain plasticity whereby the combination of both seems to be most effective. We hypothesized that dancing could be an ideal intervention because it combines exercise, cognitive, coordination and emotional features. In this study 26 healthy senior citizens (63–80 years old) were randomized into a dancing group (n = 14) or a physical exercise group (n = 12). After 18 months the dancing group showed increased grey matter volumes, especially in the frontal and temporal regions including the gyrus parahippocampalis and the precentral gyrus. The physical exercise group showed grey matter volume increases only in subcortical regions. Our results suggest that dancing is more effective in inducing neuroplasticity in regions normally affected by aging than classical repetitive fitness training. We assume this to be related to the multimodal nature of dancing, which combines exercise, cognitive and coordination features. These findings demonstrate for the first time in a longitudinal study the positive effects of dancing programs for the prevention of volume loss of grey matter and neurodegenerative diseases in the elderly.  相似文献