客户化远程学习系统学习对象元制作规则

个性化远程教学系统的一个重要问题就是制作与管理学习对象元,学习对象元构成了系统的最基本资源.依据学习心理学的基本概念和电子版超文本学习材料对学习者的基本影响特征,以及个性化远程教学的基本理论与技术,提出了学习对象元制作的基本规则与方法.     

Neuroscience: rewiring the adult brain

Any analysis of plastic reorganization at a neuronal locus needs a veridical measure of changes in the functional output--that is, spiking responses of the neurons in question. In a study of the effect of retinal lesions on adult primary visual cortex (V1), Smirnakis et al. propose that there is no cortical reorganization. Their results are based, however, on BOLD (blood-oxygen-level-dependent) fMRI (functional magnetic resonance imaging), which provides an unreliable gauge of spiking activity. We therefore question their criterion for lack of plasticity, particularly in the light of the large body of earlier work that demonstrates cortical plasticity.