量感的内涵、特征、价值与培养策略

量感的培养有助于学生提高和完善数学核心素养、问题解决能力和估测能力。量感的培养是一个较长期的、反复体验、不断矫正的过程,与学生的个体经验有关。教师在教学中应重视学生对量的深度体验和对单位量的感知,加强学生对叠加量的感悟,开展丰富的估测活动,促进学生形成具身经验和单位量感,建立不同量感,精准完善量感。

深度感“量” 培养量感——以北师大版五年级《体积与容积》一课量的概念教学为例

量感的培养是一个长期的、反复体验、不断修正的过程,必须以量的积累为基础。在量的概念教学中,教师要重视学生对量的触觉和视觉等的深度体验,开展丰富的实验活动和估测活动,在对比、辨析、思考、推理中,多方位帮助学生建立概念表象,不失时机地培养学生的量感,提升学生的数学素养。

Assessing proprioception:A critical review of methods

To control movement,the brain has to integrate proprioceptive information from a variety of mechanoreceptors.The role of proprioception in daily activities,exercise,and sports has been extensively investigated,using different techniques,yet the proprioceptive mechanisms underlying human movement control are still unclear.In the current work we have reviewed understanding of proprioception and the three testing methods:threshold to detection of passive motion,joint position reproduction,and active movement extent discrimination,all of which have been used for assessing proprioception.The origin of the methods,the different testing apparatus,and the procedures and protocols used in each approach are compared and discussed.Recommendations are made for choosing an appropriate technique when assessing proprioceptive mechanisms in different contexts.