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  3. PASSAGE ONE (1) The multimillion dollar brain training industry is under attack. In October 2014, a group of over 100 eminent n

PASSAGE ONE (1) The multimillion dollar brain training industry is under attack. In October 2014, a group of over 100 eminent n

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问题 PASSAGE ONE
(1)  The multimillion dollar brain training industry is under attack. In October 2014, a group of over 100 eminent neuroscientists and psychologists wrote an open letter warning that " claims promoting brain games are frequently exaggerated and at times misleading. " Earlier this year, industry giant Lumosity was fined $2m, and ordered to refund thousands of customers who were duped by false claims that the company’s products improve general mental abilities and slow the progression of age-related decline in mental abilities. And a recent review examining studies purporting to show the benefits of such products found "little evidence...that training improves everyday cognitive performance. "
(2)  While brain training games and apps may not live up to their hype, it is well established that certain other activities and lifestyle choices can have neurological benefits that promote overall brain health and may help to keep the mind sharp as we get older. One of these is musical training. Research shows that learning to play a musical instrument is beneficial for children and adults alike, and may even be helpful to patients recovering from brain injuries.
(3)  Playing a musical instrument is a rich and complex experience that involves integrating information from the senses of vision, hearing, and touch, as well as fine movements, and learning to do so can induce long-lasting changes in the brain. Professional musicians are highly skilled performers who spend years training, and they provide a natural laboratory in which neuroscientists can study how such changes—referred to as experience-dependent plasticity—occur across their lifespan.
(4)  Early brain scanning studies revealed significant differences in brain structure between musicians and non-musicians of the same age. For example, the corpus callosum, a massive bundle of nerve fibres connecting the two sides of the brain, is significantly larger in musicians. The brain areas involved in movement, hearing, and visuo-spatial abilities also appear to be larger in professional keyboard players. And, the area devoted to processing touch sensations from the left hand is increased in violinists.
(5)  These studies compared data from different groups of people at one point in time. As such, they could not determine whether the observed differences were actually caused by musical training, or if existing anatomical differences predispose some to become musicians. But later, longitudinal studies that track people over time have shown that young children who do 14 months of musical training exhibit significant structural and functional brain changes compared to those who do not.
(6)  Together, these studies show that learning to play a musical instrument not only increases grey matter volume in various brain regions, but can also strengthen the long-range connections between them. Other research shows that musical training also enhances verbal memory, spatial reasoning, and literacy skills, such that professional musicians usually outperform non-musicians on these abilities.
(7)  Importantly, the brain scanning studies show that the extent of anatomical change in musicians’ brains is closely related to the age at which musical training began, and the intensity of training. Those who started training at the youngest age showed the largest changes when compared to non-musicians.
(8)  Even short periods of musical training in early childhood can have long-lasting benefits. In one 2013 study, for example, researchers recruited 44 older adults and divided them into three groups based on the level of formal musical training they had received as children. Participants in one group had received no training at all; those in the second had done a little training, defined as between one and three years of lessons; and those in the third had received moderate levels of training (four to fourteen years).
(9)   The researchers played recordings of complex speech sounds to the participants,  and used scalp electrodes to measure the timing of neural responses in a part of the auditory brainstem. As we age, the precision of this timing deteriorates, making it difficult to understand speech, especially in environments with a lot of background noise. Participants who had received moderate amounts of musical training exhibited the fastest neural responses, suggesting that even limited training in childhood can preserve sharp processing of speech sounds and increase resilience to age-related decline in hearing.
(10)   More recently, it has become clear that musical training facilitates the rehabilitation of patients recovering from stroke and other forms of brain damage, and some researchers now argue that it might also boost speech processing and learning in children with dyslexia and other language impairments. What’s more, the benefits of musical training seem to persist for many years, or even decades, and the picture that emerges from this all evidence is that learning to play a musical instrument in childhood protects the brain against the development of cognitive impairment and dementia.
(11)  Unlike commercial brain training products, which only improve performance on the skills involved, musical training has what psychologists refer to as transfer effects—in other words, learning to play a musical instrument seems to have a far broader effect on the brain and mental function, and improves other abilities that are seemingly unrelated.
(12)  Learning to play a musical instrument, then, seems to be one of the most effective forms of brain training there is. Musical training can induce various structural and functional changes in the brain, depending on which instrument is being learned, and the intensity of the training regime.  It’s an example of how dramatically life-long experience can alter the brain so that it becomes adapted to the idiosyncrasies of its owner’s lifestyle.  
What can we infer about the corpus callosum?
选项
答案A
解析 推理判断题。根据题干关键词corpus callosum定位至第四段前两句。其中第二句指出，音乐家的胼胝体明显更大，可见音乐家和非音乐家的胼胝体明显不同，故A为答案。相关段落并没有说胼胝体对音乐家是最重要的，B为过度推断，故排除；第四段只提到有关运动、听力和视觉空间能力的大脑区域会因练习乐器而发生变化，但并没有说这些区域是胼胝体，故排除C；第四段最后一句提到了小提琴手用于处理左手触觉的脑部区域也有变化，但并未说这个区域是胼胝体，故排除D。
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