You are hereArgument: recent study of eighteen rhesus monkeys provides clues as to the effects of birth order on an individual's levels of stimulation. The study showed that in stimulating situations (such as an encounter with an unfamiliar monkey), firstborn infant

Argument: recent study of eighteen rhesus monkeys provides clues as to the effects of birth order on an individual's levels of stimulation. The study showed that in stimulating situations (such as an encounter with an unfamiliar monkey), firstborn infant


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By sheepfei199184 - Posted on 20 April 2012

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Argument: recent study of eighteen rhesus monkeys provides clues as to the effects of birth order on an individual's levels of stimulation. The study showed that in stimulating situations (such as an encounter with an unfamiliar monkey), firstborn infant monkeys produce upto twice as much of the hormone cortisol, which primes the body for increased activity levels, as do their younger siblings. Firstborn humans also produce relatively high levels of cortisol in stimulating situations (such as the return of a parent after an absence). The study also found that during pregnancy, first-time mother monkeys had higher levels of cortisol than did those who had had several offspring.

The author of the letter introduction a investigate result which perhaps reveal impact of birth order on an individual's levels of stimulation. To support the claim, the author cites three examples about the firstborn infant,firstborn humans and first-time mother monkey sequentially to prove that a positive relationship may be exists with birth order and the level of the hormone cortiso. Close scrutiny of each of the evidence, however, none of them is credible.

First at all, as for the first example, producing twice as much of the hormone cortisol doesn't indicate that there is a relation with birth order and the level of hormone,perhaps it may be caused by other factors such as gender:as I know,monkeys of different gender will have different level of hormone even if they share the same circumstance. According to it,there is a flaw in the research that it doesn't remind gender and so that they can't rule out a following situation that all the first infant monkeys in experiment are female who will actually secrete more hormones. Even if they are not first infant,they can also produce the highest level of hormones. In short, the factors that have impact on the level of stimulation may be monkey's gender rather than birth order.

Second, about the firstborn humans, the experiment is also not credible.It's entirely possible that the firstborn infant doesn't have playmates at home, so parents are their only friends. After a period time doesn't see their parents, they will be so excited and then produce more hormones when parents come home. On the contrast, as for the later born infant, they use to play with their sisters or brothers,so maybe they don't mind whether their parents are at home or not.

Third, about the last experiment, the author assume unfairly that first-time mother monkeys who have higher levels of hormone will delivery an infant monkey that also have relatively more hormone. However, the author use no evidence to support the assumption.Lacking such evidence it is equally possible that the hormone level of mothers don't influence the offspring's. Thus, the author 's claim is not credible.

In sum, all these three examples can't attest the relationship with birth order and the level of hormone of cortiso.The results from the experiments may be influent by other factors,such as gender. So to strength the claim, the author should rule out all other possible factors.

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essayE-rater's picture

Sentence: However, the author use no evidence to support the assumption.Lacking such evidence it is equally possible that the hormone level of mothers don't influence the offspring's. Thus, the author 's claim is not credible.
Description: The fragment author use no is rare
Suggestion: Possible agreement error: Replace use with verb, past tense

Sentence: To support the claim, the author cites three examples about the firstborn infant,firstborn humans and first-time mother monkey sequentially to prove that a positive relationship may be exists with birth order and the level of the hormone cortiso.
Error: cortiso Suggestion: No alternate word
Error: firstborn Suggestion: first born
Error: first-time Suggestion: first time

Sentence: Second, about the firstborn humans, the experiment is also not credible.It's entirely possible that the firstborn infant doesn't have playmates at home, so parents are their only friends.
Error: doesn't Suggestion: does not
Error: firstborn Suggestion: first born

Attribute Value Ideal
Score: 3.0 out of 6
Category: Satisfactory Excellent
No. of Grammatical Errors: 1 2
No. of Spelling Errors: 3 2
No. of Sentences: 14 15
No. of Words: 413 350
No. of Characters: 1970 1500
No. of Different Words: 179 200
Fourth Root of Number of Words: 4.508 4.7
Average Word Length: 4.77 4.6
Word Length SD: 2.439 2.4
No. of Words greater than 5 chars: 142 100
No. of Words greater than 6 chars: 100 80
No. of Words greater than 7 chars: 60 40
No. of Words greater than 8 chars: 30 20
Use of Passive Voice (%): 0 0
Avg. Sentence Length: 29.5 21.0
Sentence Length SD: 12.844 7.5
Use of Discourse Markers (%): 0.929 0.12
Sentence-Text Coherence: 0.384 0.35
Sentence-Para Coherence: 0.646 0.50
Sentence-Sentence Coherence: 0.106 0.07
Number of Paragraphs: 5 5