The kind of thoughts that keep a person from falling asleep can arise in either half of the brain. Therefore, a pers...

Mansi on August 13, 2015

Help

Can you please diagram and explain this

6 Replies

Melody on September 2, 2015

This passage does not contain any Sufficient & Necessary statements. So there is nothing to diagram. Since we are faced with an argument, we must first break it down.

Conclusion: a person being prevented from sleeping solely by such thoughts would be able to fall asleep by closing the eyes and counting sheep

Why? We are told that the kind of thoughts that keep a person from falling asleep can arise in either half of the brain. Further we are told that the activity of closing ones eyes and counting sheep fully occupies the left half of the brain with counting and the right half of the brain with imagining sheep, thereby excluding the sleep-preventing thoughts.

Answer choice (C) states: "Thoughts of sheep would not keep the person awake at that time."

We are told that imagining sheep will occupy the right half of the brain, while counting them will occupy the left half of the brain because that will prevent the kind of thoughts that keep a person from falling asleep. However, if - for some reason - the thought of sheep was the exact thought keeping a person awake, then the act of picturing sheep will not exclude sleep-preventing thoughts, i.e. thinking of sheep will only continue to keep the person awake.

Thus, answer choice (C) is the correct answer.

Hope that clears things up! Please let us know if you have any other questions.

Amiracle on November 23, 2015

Why could it not be D?

Mehran on November 24, 2015

Thank you for your question, @sojiman.

This is a Strengthen with Necessary Premise question. This means that the correct answer, once identified and negated, would make the argument in the stimulus fall apart. Answer choice (C), if negated, reads "thoughts of sheep might keep the person awake."

Let's look at answer choice (D): "thoughts of sheep would induce sleep in the person whenever those thoughts arose." Negate that: "thoughts of sheep would not necessarily induce sleep in the person whenever those thoughts arose." That does not make the argument fall apart, since it's still possible such thoughts could induce sleep, right?

Another way to eliminate (D) is to consider the scope of the conclusion. This argument is specifically about those times when a person cannot sleep at night. Answer choice (D) is much broader--it's talks about "whenever." That's not necessary to strengthen the argument in the stimulus.

Hope this helps! Please let us know if you have any additional questions.

Amanda on March 31, 2018

I thought we are doing Must Be True questions. What is a strengthen w/Necessary Premise doing here?

Rebecca on September 21, 2018

Hello! I've gone ahead and read all of the explanations but I'm still a bit lost. (D) initially seemed like the most reasonable answer even though "whenever" is much broader than what the passage discusses. Thank you

Mehran on September 21, 2018

@sojiman @Rebeccas-Alvarado the problem with (D) is that it is not necessarily true. We are not talking about "thoughts of sheep", we are talking about counting sheep.

Additionally, nothing in the stimulus supports this notion that any time a person thinks about sheep, sleep will be induced.

Hope that helps! Please let us know if you have any other questions.