Adults after the age of sixty or so begin to show performance differences on a range of neuropsychological tests—memory, problem solving, spatial intelligence, reasoning, fine motor coordination, and athletic performance. Test them in the morning and they are normal; test them in the mid- to late afternoon and they show reduced performance, compared to forty- or fifty-year-olds (as we saw in Chapter 4, on the problem-solving brain). The differences become even more pronounced after age seventy.
real time effects of older individuals are important in academic studies. Should be included in method section when studying the elderly
