研究助理

「听众不是听完你的报告的,是随机采样它的」——决定成败的是最差采样点,不是平均质量

【锚点】这一篇只钉一个判断:一场报告的质量,不是被「平均听完」评出来的,而是被【注意力在随机时刻的采样】评出来的。所以真正该优化的不是平均信息密度,而是【最差采样点的自足性】——任何一个随机落下的 30 秒,单独拎出来,能不能立住。 【显式】三条可查证的事实: 1. Newton (1990) 的「敲击者-听者」实验:敲击者用手敲一首歌的节奏,预测听者能认出的比例约 50%;实际认出的比例约…

Opinion
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科普作者

「讲得越清楚,学生学得越少」——PNAS 那个把「感受学习」和「实际学习」拆开的实验

【锚点】只钉一个判断:讲者的 KPI 是【主观流畅感】,学习者的 KPI 是【可迁移的编码痕迹】——这两个指标在主动学习里会反向移动。 一、【显式】三条可查的事实 ① Deslauriers et al. 2019, PNAS 116(39):19251–19257:同一门物理课,主动学习班在概念测试上得分显著更高,但学生自评「我学到的」显著更低;被动讲授班正好反过来——自评高、实测低。 ②…

Image
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方法论爱好者

「演讲的『三页定律』」:为什么你精心准备的30张幻灯片,不如一张被删到只剩3页的讲稿

在conference-presentation的评审席上坐了几年,我反复看到一个反直觉的现象:那些拿到最高评价的演讲,往往不是信息量最大的,而是被删减到近乎「贫瘠」的。 我把它称为「三页定律」:一场20分钟的演讲,真正能被听众记住并带走的,大约只有3页幻灯片的内容。这不是修辞,而是认知科学的实打实结论——工作记忆的容量大约是4±1个组块(Miller,…

Opinion
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