本帖最后由 liuyonghao 于 2010-4-19 20:41 编辑
攻击点:
1:婴儿的轻微紧张是由mel引起的吗
2:就算轻微紧张是由mel引起的,但表现轻微紧张就会害羞吗
3:就算轻微紧张会导致害羞,但青少年害羞还有其他原因
4:作者的论据也有问题,25样本太小,而且青少年一半害羞就一定很高吗
The argument contains several facets that are questionable. First, the argument unfairly assumes a causal relationship between increased levels of melatonin and signs of mild stress in the infants . Second ,the argument rests on the gratuitous assumption that mild stress will cause shyness .Third ,the argument fails to take into account other possible factors that might have caused shyness in the surveyed infants. Last but not least , the reliability of the survey is open to doubt.I will discuss each of these facets in turn.
To begin with ,the arguer fails to establish a causal relationship between increased levels of melatonin and signs of mild stress in the infants . First,the arguer does not tell us what is melatonin .we can not know its definition from the survey ,the arguer only give us a ill-defined concept that it is a hormone which affect some brain functions.Does it really affect the infants ?it is possible the fact that milatonin only have something to do with the pregnant mother .Second ,even assuming that melatonin will affect the infants ,it does not mean it will make the infants dipressed. Therefore ,the arguer commits a fallacy of causal oversimplification.
Even if the increased level of melatonin will result in mild stress , there arise another problem with this argument , namely the unfounded causal relationship between signs of mild distress and shyness .It is normal that a infant feel depressed when faced with some unfamiliar stimulus .we can not simply consider a infant who is under depress as a shy baby . It is possible the fact that the surveyed infants are more sensitive to changes of the environment .Accordingly,the arguer simply equates mild distress with shyness ,which is unwarranted.
Even if signs of mild distress and shyness have a causal association,the arguer fails to rule out other factors that might account for shyness in the surveyed teenagers.The author states that the shyness of teenagers are outcome of the increase of melatonin when they were infants. However, it is equally possible that other factors result in the shyness of teenagers, such as new changes of their bodies ,their family background or their experience .Hence ,the arguer commits a fallacy of hasty generalization .
Finally ,how the survey was conducted also deserve our consideration while evaluating the evidence of survey . The survey only have a sample of 25 infants and it is too small to draw any conclusion from so small sample. Moreover , the fact that half of the teenagers who grow up from the 25 infants feel shy does not definitely mean that the percentage is high .Common sense tell us that teenagers are more shy than people of other age,therefore , the result that half of the surveyed teenagers feel shy is possible not strange at all. The arguer should tell us what is the percentage of the common teenagers of the same age who feel shy.
In summary ,the conclusion reached in this argument is invalid and misleading . To make the argument more convincing ,the arguer should tell us more about meltanin and establish a causal relationship between the increased level of meltanin and shyness.what is more,a survey which involve more infants is indispensible . Without this sort of information ,the argument reaches too hasty a conclusion.
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改上楼文章:
(本文中author最好改为arguer,红色表示修改,蓝色表示好词好句,修改的可能有点不到位)
In this argument, the arguer concludes that melatonin(M) increasing before birth causes shyness during infancy and later life. To strengthen this conclusion, the arguer provides a statistics(改为survey) that 25 infants who showed mild of distress when exposed to unfamiliar stimuli were more likely to have been conceived in early autumn. The arguer also cites a supporting evidence indicating that more than half of these children identified themselves as shy. However, close scrutiny reveals that it contains several unconvincing assumptions and is therefore unpersuasive.
To begin with, the author's conclusions depend on the assumption that the study results are statistically reliable. Yet, the author offers no evidence to substantiate this assumption. The 25 infants as a sample in these two studies is neither statistically significant, nor is representative of the overall population of infants showing signs of mild distress when exposed to unfamiliar stimuli, and it is entirely possible that a large number of children of this kind other than 25 ones were conceived in other seasons. Therefore, drawing a conclusion based on such a small sample would not be justified.
Additionally, a correlation between M and infants'shyness does not necessarily indicates that the former is the cause of the later. The author apparently overlooks some other factors that may also account for children's shyness. For instance, those teenagers characterized as shy were actually influenced by their growing environment rather M, or perhaps there are other chemicals instead of M that would affect brain functions and led to the timidity. Without ruling out these possible factors, the author cannot conclude so hastily that M is the cause of the shyness.(总结地很好,句子也很漂亮)
Finally, the fact that more than half of these children identifying themselves as shy proves nothing about bolstering this conclusion, because in this sample consisted of 25 teenagers, the term "more than half" can possibly mean, for example, 13 out of 25, which would render any conclusion based upon it invalid. Unless the author assures me that this scenario is unlikely, she or he cannot confidently draw any conclusion.(这一段还可以攻击的是样本太少了或作者没有提供正常青少年的羞涩比例,说不定正常青少年也有一半多羞涩)
As it stands, this argument is not well reasoned. To better support its conclusion, the author should provide more substantial evidence to prove that these studies are dependable. For example, perhaps the sample should be enlarged ; besides,factors other than M should not be neglected. |