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人在几岁时最聪明？

Scientists use a test called Digit Symbol Substitution to assess everything from dementia to brain damage. It requires people to use a number of cognitive skills at once — including processing speed, sustained attention, and visual skills. The tool, which typically involves pairing numbers with symbols, is also part of the Wechsler Adult Intelligence Scale, one of the most widely used measures of intelligence.

科学家们通过一种名为数字符号替换的测试来评估痴呆症、脑损伤等各种大脑情况，测试内容通常是将数字和符号配对。该测试要求人们同时使用多种认知能力，如信息处理速度、持久的专注力以及视觉能力等。数字符号替换测试也是韦氏成人智力量表的一种工具。韦氏成人智力量表是应用最广泛的智力测量标准之一。

Hartshorne employed the test in his study of how intelligence changes over time and found that participants' performance generally peaked in their late teens.

哈茨霍恩应用这项测试，研究智力如何随着时间变化，并发现参与者最好的表现通常是在二十岁之前那几年。

22岁：对陌生名字记忆能力的巅峰

Most adults are bad at memorizing bits of information without context, a phenomenon that neuroscientists chock up to the Baker/Baker paradox. A classic example of this idea is that you'll have an easier time remembering a story about someone who bakes than a person with the last name Baker. Because there's no context that links the person to the name, it doesn't become firmly lodged in your memory.