来自《耶鲁大学开放课程：心理学导论 第13集》

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  if--
  如果...
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  and the IQ tests hide that.
  而智商测试却掩盖了这一现象
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  Here is why they hide that.
  为什么会掩盖这一现象呢
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  They hide that because they always make 100 the average.
  因为它假设主体人口的平均智商为100
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  So, you come home and you say,
  所以 你跑回家 说
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  "Dad, Dad, I just did an IQ test. I got 120."
  "爸 我刚在智商测试中拿了120"
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  And your father says, "Good work, Son.
  你爸爸则会回答 "干得不错 孩子
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  I got 122 when I was your age,"
  我是你这么大的时候我拿了122呢"
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  but what neither of you acknowledge
  但你们俩都没有注意到
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  is your test was much harder.
  你的测试实际上难度更大
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  As people got better,
  随着智力水平的上升
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  they had to make the test harder and harder.
  人们不得不把测试的难度设定得越来越大