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  3. 【61】 Scientists at Johns Hopkins have discovered "striking" differences between men and women in a part of the brain linked with

【61】 Scientists at Johns Hopkins have discovered "striking" differences between men and women in a part of the brain linked with

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问题    【61】 Scientists at Johns Hopkins have discovered "striking" differences between men and women in a part of the brain linked with ability to estimate time, judge speed, visualize things three-dimensionally and solve mathematical problems.
   【62】 The differences, the researchers say, may underlie well-known trends that vary by sex, such as the fact that more men than women are architects, mathematicians and race-car drivers.
   In a study reported this week in the journal Cerebral(大脑的) Cortex(皮层), the researchers show that a brain region called the inferior parietal lobe (IPL,即下顶叶) is significantly larger overall in men than in women. The area is part of the cerebral cortex and appears on both sides of the brain just above ear level.
   Also, there is a symmetry difference, with men shavings a larger left IPL than right. 【63】 In women in the study, it is the right IPL that is somewhat larger, though the difference between the two sides of the brain is less obvious than in men, says Psychiatrist Godfrey Pearlson, M. D. , who headed the project.
   Researchers also compared IPL volumes on the left and the fight sides of the brain. After allowances for men’s larger overall head and brain size, men had roughly 6 percent more IPL tissue than women.
   "The inferior parietal lobe is far more developed in people than in animals and has evolved relatively recently," says Pearlson. 【64】 It allows the brain to process information from senses such as vision and touch, and enables the sort of thinking involved in selective attention and perception.
   Studies link the right IPL with a working memory of spatial relationships, the ability to sense relationships between body parts and awareness of a person’s own effects or feelings. The left IPL, Pearlson says, is more involved in perception, such as judging how fast something is moving, estimating time and shaving the ability to mentally rotate 3-D figures.
   "To say this means men are automatically better at some things than women is a simplification," says Pearlson. "It’s easy to find women who are fantastic at math and physics and men who excel in language skills. Only when we look at very large populations and look for slight but significant trends do we see the generalizations. 【65】 There are plenty of exceptions, but there’s also a grain of truth, revealed through the brain structure that we think underlies some of the ways people characterize the sexes."
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答案当然有很多例外，但也不乏从大脑结构中显露出的事实，我们认为这事实构成了人们在性别方面的某些特征。
解析 这是一个并列的there be句型，句架是there are…but there is．．．。在这个句型中又包含了插入成分revealed through the brain structure和一个由that引导的用以修饰前面truth的定语从句。
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