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发表于 2010-4-18 12:25:46
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本帖最后由 weasel 于 2010-4-18 17:35 编辑
In order to convince others that increased levels of melatonin before birth cause shyness during infancy and this shyness will continues into their later lifetime,the author presents us seemly strong reasons, containing the long term study about the guys' shyness and unique time when they are conceived with brains that are effected by their mothers' increased levels of melatonin. While we first glance at this argument, it seems somewhat credible. However, through further analysis about all the relevant evidence, the argument is questioned with the following aspects.
First of all, the argument is questionable at the mere mention of the long term study. In one hand, the number of infants who take part in this experiment is too limited to explain any consequence. There is a circumstance that most parts of 25 infants, or even all of them, contribute to special cases. We all believe that to some extent, any conclusion must be made in a common situation. On the other hand, the author also lacks description of experiments' environment. Did all of them participate in the study at the same time in the same place? Are there any other unusual stimuli that can also affect their performances existing? How about infants' moods, and health situations, and did they coordinate their action with the study? Before the author make final conclusion, he/she should present more complete data about the experiment that can answer these similar series of doubts.
Secondly, even if the questions above are answered, the following assumption that teenagers who show signs of distress identify themselves as shy is unwarranted. Are they truly shy? The author lacks an exact explanation about their shyness and maybe they consider their unnatural attitudes and behaviors as shyness, which are common for most people when they are interviewed at first time. We can not exclude the possibility that some teenagers are so naughty that they act as a shy person on purpose. In such a condition that the number of teenagers who are investigated is few, the cases above may happen with more opportunities. Therefore, the relevant explanations should not be neglected when it refers to this kind of topic.
Finally, the author offer a ridiculous assumption which he/she doesn’t provides enough evidence to confirm it. Does melatonin, which affects the infants' function of brains, really exert significant influences on shyness? It is entirely possible,but not absolute. Many other facts can also cause their shyness between infancy and juvenile era. For instance, the family's condition which includes education, economic level and etc plays an essential role on their nature forming. In addition, the author is also too arbitrary to state that their shyness will continue into later life. The juvenile is a period when teenagers just begin to form an independent personality. It means that the shyness can be changed and converted into an opposite character. In sum, without ruling out these and other possible factors, the evidence is not convincing.
Overall, after the analysis, the argument definitely lacks enough evidence to support its conclusion. Therefore, to make his/her statement more credible, more efforts should be taken to complete the main three points above firstly. Otherwise, the assertion will be an inevitable failure. |
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