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发表于 2009-11-7 14:48:44
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Argument53: Thirteen years ago, researchers studied a group of 25 infants who showed signs of mild distress when exposed to unfamiliar stimuli such as unusual odor or a tape recording of an unknown voice. The discovered that these infants were more likely than other infants to have been conceived in early autumn, a time when mother’s production of melatonin—a hormone known to affect some brain functions—would naturally increase in response to decreased daylight. In a follow-up study conducted earlier this year, more than half of these children—now teenagers—who had shown signs of distress identified themselves as shy. Clearly, increased levels of melatonin before birth cause shyness during infancy and this shyness continue into later life.
In the argument, the author cites a survey conducted 13 years ago, involving 25 infants who revealed mild distress when contacted with unfamiliar stimuli. The author also points out that these children are likely to be conceived during a period when mother’s melatonin goes up and would become shy after grow up. Based on these facts, the author comes to the conclusion that shyness during infancy which would maintain into later life is due to increased level of melatonin. However, we can see no reason for the author to make conclusion of this kind.
To begin with, the 25 infants involved in the survey are not representative of people in every quarter of the world. The number of 25 is not large enough for the research to make any sense. It is possible that most of the other infants who were also conceived during autumn are not shy at all. Or perhaps all these 25 selected people suffer from other diseases or miserable experiences which result in their shyness. The above possibilities would serious undermine the reliability of the survey.
In the second place, the fact that most of these infants who show distress and become pretty shy are conceived during their mothers’ melatonin increased does not necessarily indicates that it is melatonin that results in their shyness. The author overlooks many other alternative explanations that would render these infants shy, these alternatives may include: perhaps it is other hormones which also increased in autumn rather than melatonin that caused their shyness, there is also a chance that it is the season or temperature lead to their shyness. Thus, their dispositions may have nothing to do with melatonin at all.
In the third place, these children may not really shy. In the argument, the author just mentions “they identified themselves as shy”, however, thus it is quite possible that other people around them, their teachers, friends, or parents all hold the opposite opinion. As we all know, in most cases people could not accurately justify their own dispositions. Maybe they are quite outgoing. If it is the case, the results of the survey would not be taken seriously.
In addition, the author mixes the meaning of distress with shyness. Actually, these two words totally have separated meanings. People showing distress may not be shy and it goes the same way when turn back.
Finally, even if shyness in these infants is due to melatonin and they children are born with shyness, there is no evidence that the shyness will come along with them in their future life. As we all know, many factors could serve to build a person’s disposition, such as, living conditions, education, friends, parents, majors and so forth. For instance, if these children get enough encourage and care from their teachers and parents, they are likely to turn outgoing. Based on this line of reasoning, whether shyness would continue to their later life depends.
To sum up, providing more evidence that shyness is due to melatonin and it would continue to these children’s future would contribute to make the article more logical. Besides, it would be good for the author to show more details of the research. And the author should think thoroughly and rule out other alternative explanations. |
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