Astronauts who experience weightlessness frequently get motion sickness. The astronauts see their own motion relative to passing objects, but while the astronauts are weightless their inner ears indicate that their bodies are not moving. The astronauts’ experience is best explained by the hypothesis that conflicting information received by the brain about the body’s motion causes motion sickness.

Summarize Argument: Phenomenon-Hypothesis
The author concludes that motion sickness is caused by the brain receiving conflicting information about the body’s motion.

Notable Assumptions
The author assumes that conflicting information rather than some other phenomenon that astronauts experience in space is responsible for motion sickness. This same phenomenon of conflicting information should thus be applicable on earth, as well.

A
During rough voyages ship passengers in cabins providing a view of the water are less likely to get motion sickness than are passengers in cabins providing no view.
If the passengers can’t see the water, then they wouldn’t be receiving conflicting information. Since these passengers are less likely to get motion sickness, it would seem the cause really is conflicting information.
B
Many people who are experienced airplane passengers occasionally get motion sickness.
We don’t care about occasional motion sickness. Besides, we have no idea if planes feature the same “conflicting information” phenomenon as space shuttles.
C
Some automobile passengers whose inner ears indicate that they are moving and who have a clear view of the objects they are passing get motion sickness.
The author never says conflicting information is the only way motion sickness occurs. It’s simply the explanation for how motion sickness occurs for austronauts.
D
People who have aisle seats in trains or airplanes are as likely to get motion sickness as are people who have window seats.
This would seem to strengthen the author’s argument, but we have no idea if people who sit in window seats are looking out the windows and getting conflicting information. (A) closes that ambiguity.
E
Some astronauts do not get motion sickness even after being in orbit for several days.
The author never says all astronauts get motion sickness. She simply explains what probably causes motion sickness for astronauts.

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The government has spent heavily to clean groundwater contaminated by toxic chemical spills. Yet not even one spill site has been completely cleaned, and industrial accidents are spilling more toxic chemicals annually than are being cleaned up. More of the government’s budget should be redirected to preventing spills. Since prevention is far more effective than cleanup, it makes little sense that the entire annual budget for prevention is less than the amount spent annually on one typical cleanup site.

Summarize Argument
The author thinks that the government should spend more on preventing chemical spills, rather than focusing primarily on cleaning them up. Why should we believe this? First, the current strategy is slow and is not keeping up with new spills; this shows us that something needs to change. Second, the author tells us that prevention is more effective than cleanup; this indicates what the change should be. Finally, we learn that the current annual spending on prevention is less than even one cleanup site costs per year; this highlights the urgency of the situation. All together, everything in the argument leads to the conclusion that we should spend more on prevention rather than cleanup.

Identify Argument Part
The claim about how the government’s budget should be redirected is the main conclusion of the argument.

A
It represents an unsupported speculation.
The proposal of redirecting the budget is not unsupported; in fact, everything else in the argument supports it.
B
It both supports another claim in the argument and is supported by others.
The proposal of redirecting the budget does not support anything else in the argument. It receives support, but it’s the main conclusion, so the support ends there.
C
It is the claim that the argument as a whole is structured to support.
This correctly describes that the proposal of redirecting the budget is the author’s main conclusion, and is supported by everything else in the argument.
D
It is a presupposition on which the argument is explicitly based.
The author never makes an explicit presupposition, so this wouldn’t be true of any part of the argument. Also, the claim about redirecting the budget is supported by other claims, not assumed (or presupposed).
E
It presents an objection to another proposal mentioned in the argument.
There is no other proposal mentioned in the argument. The author is arguing for a change from the current policy, but there are no competing views about what the change should be.

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Which one of the following is most strongly supported by the information above?

This is a Most Strongly Supported question.

Computers perform actions that are closer to thinking than anything nonhuman animals do.

Think about developments in artificial intelligence – ChatGPT and other AI systems can write poetry, analyze business strategies, diagnose medical conditions, and more. These are examples of computers doing things that are closer to thinking than anything animals do. (I’m just going to drop “nonhuman” when referring to animals. I like the LSAT’s reminder that humans are animals, but for the sake of brevity, humans are humans and animals are animals in this explanation.)

But computers do not have volitional powers, although some nonhuman animals do.

But computers don’t have volitional powers – the ability to make one’s own choices. ChatGPT isn’t making choices when it responds to you – it’s simply doing as it’s programmed to do. Some animals do make choices, however.

Let’s put what we know together:

Computers are closer to thinking than animals are, and they don’t have volitional powers.

Animals are further away from thinking than computers, and some of them do have volitional powers.

This stimulus doesn’t lend itself to a strong prediction before the answers, so let’s just dive in and find the right answer via process of elimination.

Correct Answer Choice (A) Having volitional powers need not involve thinking.

This answer is strongly supported by the example of some animals. We know that some animals have volitional powers. But we also know that no animal engages in thinking. How do we know this? Because animals are further away from thinking than computers. And computers don’t even do thinking. There’s a divide in the world between thinking and not-thinking – both computers and animals are on the not-thinking side. Computers are just “closer to thinking” than animals.

So if some animals have volitional powers, but they don’t do thinking, that means volitional powers don’t need to involve thinking. In other words, it’s possible to have volitional powers without doing thinking.

Answer Choice (B) Things that are not animals do not have volitional powers.

We know that computers don’t have volitional powers. So some things that are not animals do not have volitional powers: computers. But we don’t know whether there’s anything else out there that lacks volitional powers. So we can’t say that “things that are not animals” don’t have volitional powers – we don’t know about the whole set of those things. We only know about computers. Maybe one-celled bacteria have volitional powers? Maybe plants have volitional powers? It sounds weird, I know. But we don’t have anything in the stimulus to suggest that bacteria or plants don’t have volitional power.

This is a tempting answer if you interpret (B) as “Some things that are not animals do not have volitional powers.” But this statement actually should be read with an implicit “all” before it: “All things that are not animals do not have volitional powers.” Unfortunately there isn’t a universal rule about when you should interpret a plural subject like “things” to begin with an implicit “all” – it depends on context. But the vast majority of the time, you should add an implicit “all” before a plural subject rather than an implicit “some.”

“Judges convicted of fraud will be removed from office.” This means all of those judges will be removed.

“Philosophical theories that go against common sense are difficult to understand.” This means all of those kinds of philosophical theories are difficult to understand.

Answer Choice (C) Computers possess none of the attributes of living things.

The correct version of (C) could go something like this: Computers lack some of the attributes of living things. Namely, volitional powers. But we cannot hastily generalize to the conclusion that computers lack all of the attributes of living things. Besides, that’s patently false. Computers are tangible; exist in the world; and are made of atoms. Those are attributes of living things as well.

Answer Choice (D) It is necessary to have volitional powers in order to think.

(D) is an odd answer. Based on the stimulus, we can infer that it is not necessary to have volitional powers in order to perform actions that are close-ish to thinking. That’s computers. No volitional powers but close-ish to thinking. How did that get twisted into: it is necessary to have volitional powers in order to think?

Unclear. But (D) is likely trying to bait you based on what you probably think in real life. “Humans think…and they have volitional powers. So maybe you need volitional powers to think?” This line of reasoning is flawed in several ways. First, the stimulus doesn’t tell us that humans think. Second, it doesn’t tell us that humans have volitional powers. And third, the stimulus doesn’t suggest that anything is necessary for thinking. We happen to know about certain things that don’t think – computers and animals. But we have no idea whether lack of volitional powers have anything to do with why those things don’t think.

Answer Choice (E) Computers will never be able to think as human beings do.

We don’t know what will happen in the future based on this stimulus. In our current world, computers don’t think. But they might be able to think as humans do in the future.


116 comments

Marianne is a professional chess player who hums audibly while playing her matches, thereby distracting her opponents. When ordered by chess officials to cease humming or else be disqualified from professional chess, Marianne protested the order. She argued that since she was unaware of her humming, her humming was involuntary and that therefore she should not be held responsible for it.

Summarize Argument
Marianne claims that she should not be held responsible for her humming, which distracts other players during chess matches. Marianne supports this conclusion by explaining that she was unaware of her humming, and her humming is therefore involuntary.

Notable Assumptions
Marianne assumes that professional chess players should not be held responsible for involuntary behavior, even when it distracts their opponents.
Marianne also assumes that she should not be held responsible for future humming, even though she has now been made aware of the fact that she hums. In other words, she assumes that nothing will change regarding the involuntary nature of her humming.

A
The officials of chess have little or no authority to control the behavior of its professional players outside of matches.
This does not weaken Marianne’s argument, because the chess officials aren’t trying to control her behavior outside of chess matches. The argument is limited to Marianne’s habit of humming during matches, so this claim is just irrelevant.
B
Many of the customs of amateur chess matches are not observed by professional chess players.
This does not weaken Marianne’s argument. The customs of amateur chess matches have nothing to do with the argument, which is disputing whether a rule about professional chess should be enforced against involuntary behavior. This claim is irrelevant.
C
Not all of a person’s involuntary actions are actions of which that person is unaware.
This does not weaken Marianne’s argument, because she is only concerned with a particular involuntary action, humming, of which she is unaware. Saying that people are aware of some involuntary actions has no bearing on the argument.
D
A person who hums involuntarily can easily learn to notice it and can thereby come to control it.
This weakens the argument by targeting Marianne’s assumption that her habit of humming will necessarily remain involuntary. If Marianne can easily learn to recognize and control her humming, then her reasons for asking not to be held responsible disappear.
E
Not all of Marianne’s opponents are distracted by her humming during chess matches.
This does not weaken Marianne’s argument, which is based on the involuntary nature of her humming, not whether the humming truly impacts her opponents. This has no bearing on the actual substance of Marianne’s argument.

92 comments