Why our IQ levels are higher than our grandparents' | James Flynn

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James Flynn 用分类和假设推理的题目分析代际测验变化。他提出学校与工作对抽象思考的练习发生了改变；这使人有理由追问同一个分数究竟代表哪一种熟练程度。

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introducing abstractions that we try to make logically consistent, and also taking the hypothetical seriously,

So the tenor of education has changed. We are educating people to take the hypothetical seriously, to use abstractions, and to link them logically.