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Recently documented examples of neurogenesis, the production of new br

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Re: Recently documented examples of neurogenesis, the production of new br  [#permalink]

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New post 20 Jun 2017, 11:01
ankursethi297 wrote:
What is wrong with D.
I rejected E as it stated "neuron growth in canaries that sing", which seems to alter the meaning.


souvik101990 please suggest.



Hello ankursethi297,

I would be glad to help you with this query. :)

Let's take a look at Choice D: the brain growth in mice when placed in a stimulating environment or the increase in canaries' neurons when they

The pronoun they in this choice grammatically refers to neurons, suggesting that the neurons learn new songs. Logically, they must refer to canaries'. But because canaries' appears in this choice in possessive form, the non-possessive pronoun they cannot refer to the possessive noun canaries' because possessive nouns act as an adjective.

Also, this choice seems to suggest that the brain growth in mice is placed in a stimulating environment. This meaning is certainly illogical.


Hope this helps. :-)
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Re: Recently documented examples of neurogenesis, the production of new br  [#permalink]

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New post 02 Jul 2017, 17:42
devinawilliam83 wrote:
Recently documentedc, the production of new brain cells, include the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that learn new songs.

A. the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that
B. mice whose brains grow when they are placed in a stimulating environment or canaries whose neurons increase when they
C. mice's brains that grow when they are placed in a stimulating environment or canaries' neurons that increase when they
D. the brain growth in mice when placed in a stimulating environment or the increase in canaries' neurons when they
E. brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that

Why not b?


A. the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that
Incorrect

B. mice whose brains grow when they are placed in a stimulating environment or canaries whose neurons increase when they
Mice or brains? Could be clearer so we'll put "maybe" if there's no better answer.

C. mice's brains that grow when they are placed in a stimulating environment or canaries' neurons that increase when they
Neurons don't learn new songs

D. the brain growth in mice when placed in a stimulating environment or the increase in canaries' neurons when they
Same as C

E. brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that
Best answer
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Re: Recently documented examples of neurogenesis, the production of new br  [#permalink]

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New post 20 Dec 2017, 22:47
dear GMAT Ninja
I got this wrong. But, after that I find the use of WHEN is incorrect in all the first four options. Will it be deterministic error or can we really eliminate all 4 on the basis of wrong use of WHEN.
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Re: Recently documented examples of neurogenesis, the production of new br  [#permalink]

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New post 28 Dec 2017, 06:59
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dhnjy wrote:
dear GMAT Ninja
I got this wrong. But, after that I find the use of WHEN is incorrect in all the first four options. Will it be deterministic error or can we really eliminate all 4 on the basis of wrong use of WHEN.


No, a wrong answer cannot be eliminated because of use of "when".

Option D is eliminated not because "when" is used, but because parallelism is lost.

In option D, "when placed in a stimulating environment" comprises of a participle ("placed"), whereas "when they learn new songs" comprises of a clause. D would be better if the last part were as follows: "when learning new songs" (participle instead of clause.)

Moreover "increase in Neurons IN CANARIES" in E (rather than "increase in canaries' neurons)" in D goes better with "brain growth IN MICE"

Another problem with D is that the subject pronoun "they" refers to the possessive antecedent "canaries' "
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Re: Recently documented examples of neurogenesis, the production of new br  [#permalink]

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New post 24 Jul 2018, 06:59
1
I had a theory in mind when I was solving this question.
Complex gerunds can be parallel with action nouns only, and not with simple gerunds or concrete nouns. Examples of production of brain cells qualifies as action noun, and therefore can be parallel with a complex gerund or action noun only.
Does the answer satisfy the above theory?
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Re: Recently documented examples of neurogenesis, the production of new br  [#permalink]

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New post 15 Nov 2018, 18:57
coffeeloverfreak wrote:
Source : GMATPrep Default Exam Pack

Recently documented examples of neurogenesis, the production of new brain cells, include the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that learn new songs.

(A) the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that

(B) mice whose brains grow when they are placed in a stimulating environment or canaries whose neurons increase when they

(C) mice's brains that grow when they are placed in a stimulating environment or canaries' neurons that increase when they

(D) the brain growth in mice when placed in a stimulating environment or the increase in canaries' neurons when they

(E) brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that

https://www.nytimes.com/2000/01/04/science/a-decade-of-discovery-yields-a-shock-about-the-brain.html

The new cells seen in the rat brains appear at a higher rate after challenges like intense training, injury or an infection, Dr. Raastad said. Within a few years, researchers found the cells in adult mice, guinea pigs, rabbits and monkeys. In the mid-1980's, other researchers found irrefutable evidence that new cells were born in the brains of adult canaries learning new songs and chickadees that were remembering where they had stashed their winter seeds. But researchers still did not believe that new cells were created in human brains, Dr. Raastad said.

In 1997, Dr. Elizabeth Gould, an assistant professor of neuroscience at Princeton, and colleagues showed that neurogenesis, or the birth of new cells, occurred in the hippocampuses of tree shrews and marmoset monkeys. But Dr. Rakic and others said this was not possible in humans.

In 1998, Dr. Gage demonstrated that the number of brain cells in the hippocampuses of mice raised in stimulating environments increased by 15 percent -- and that the cells were born in the ventricle zone.


A- include the brain growing is incorrect
B- when they are-they is ambiguous- mice and brains
c- again they is ambiguous
D- when placed is incorrect- it can refer to brain or mice
E-Correct
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Recently documented examples of neurogenesis, the production of new br  [#permalink]

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New post 12 Feb 2019, 13:53
I'm skeptical of the use of "when" in this problem. Formally, "when" is used as a conjunction or adverb. Informally, "when" can be used as a relative pronoun in place of "at which" or "during which" (see here).

If "when" is perceived as a conjunction, then the original sentence might read like this: "When placed in a stimulating environment, recently documented examples of neurogenesis, the production of new brain cells, include the brain growing in mice". This clearly is not what we want.

If "when" is perceived as a relative pronoun, then according to the Cambridge Dictionary it isn't fulfilling its function of replacing "at which" or "during which". And thus, it's being used in some way that most grammar authorities don't agree is acceptable even for informal usage.

These concerns are important to note, but probably not enough to eliminate the options that use "when". GMAT can sometimes use language that is more informal than most grammar authorities agree is acceptable.

A more important concern is that if we assume "when" is being used as a relative pronoun, then which noun is "when" modifying? In (A) "when" could be modifying "brain growing" or "mice". We don't know because there is no verb to tell us like there is when using "that" ("that are" in (E) indicates we are modifying "mice" and not "brain growth").

Finally, in option (E) both examples use "that" rather than one using "when" and the other using "that". This creates mild parallelism that probably isn't enough to tip the scale in favor of (E) by itself but it's a nice bonus and we can feel better about choosing (E).
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Re: Recently documented examples of neurogenesis, the production of new br  [#permalink]

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New post 22 Feb 2019, 04:14
Adding on to the discussion:

Can we not eliminate (A) & (C) by looking at the fact that the 'when' [relative clause modifier] doesn't have a 'subordinate verb'?

If you look at the first part (A/C):
The brain growing/The brain growth in mice[prep phrase]when placed [verb-ed modifier] in a stimulating environment [prep phrase] -- the when relative clause is modifying the brain growing/the brain growth but the clause doesn't have a verb, since 'placed' is a modifier
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Recently documented examples of neurogenesis, the production of new br  [#permalink]

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New post 06 Mar 2019, 11:34
we need 2 examples of the PRODUCTION of new brain cells.

B/
mice and canaries are not examples of the PRODUCTION of brain cells.

C/
mice's brains and canaries' neurons are not examples of the PRODUCTION of brain cells (rather, they are examples of the brains or brain cells themselves).

... as opposed to the correct answer
E/
brain growth and an increase in neurons absolutely ARE examples of the PRODUCTION of new brain cells.
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Re: Recently documented examples of neurogenesis, the production of new br  [#permalink]

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New post 22 Apr 2019, 03:56
In option (E), the presence of the extra 'an' does not make the two phrases parallel. Can you please shed more light on that?
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Re: Recently documented examples of neurogenesis, the production of new br  [#permalink]

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New post 22 Apr 2019, 05:10
jayarora wrote:
In option (E), the presence of the extra 'an' does not make the two phrases parallel. Can you please shed more light on that?

Hi Jay, when looking for parallelism, we should not look at word on word similarity; for example, in option E, the presence of an in one phrase does not necessitate the presence of an in the other phrase.

The structure of option E is:

...include brain growth in mice ...or an increase in neurons...

Both the bold parts are Noun-phrases, and hence parallel.
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New post 14 Aug 2019, 21:25
hi experts,

1. my doubt is can a modifier ( when placed) be parallel to clause ( when they learn ) as in option D . ( i eliminated D because of that ), can i do that.


JonShukhrat,

2.
Quote:
I had a theory in mind when I was solving this question.
Complex gerunds can be parallel with action nouns only, and not with simple gerunds or concrete nouns. Examples of production of brain cells qualifies as action noun, and therefore can be parallel with a complex gerund or action noun only.
Does the answer satisfy the above theory?


2.a)a doubt posted by a user above, i want experts to confirm the above also because, the so called action noun is outside our parallell conflict ( as that is noun which includes x or Y), . whether this should be considered as well ..





slayer1983

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Recently documented examples of neurogenesis, the production of new br   [#permalink] 14 Aug 2019, 21:25

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