Logical ReasoningDifficulty: Hard

PT149 S1 Q20 ExplanationComputer modeling of reasoning tasks

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsPrinciple-Strengthen

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Stimulus

Computer modeling of reasoning tasks is far easier than computer modeling of other cognitive tasks, such as the processing of sense images. Computers can defeat chess champions, but cannot see. So, it appears that we understand much better than we understand our senses.

What this question is testing

Principle-Strengthen

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
20.

Which one of the following principles, if valid, most helps to justify

Answer choices, explained

  1. Unrelated to Goal8% picked this

    The degree of difficulty of constructing computer models of cognitive tasks is a good index of the degree of

    Since this answer has no language that would allow you to use this rule and judge which thing we understand better, it's of no use to us.

  2. Weak Evidence/Conclusion Match23% picked this

    The better we understand a computer’s ability to perform a type of task, the better we will understand our

    This is tempting. It's definitely sounding related to our conclusion language. This rule would allow us to say "we understand our ability to perform task X better than we understand our ability to perform task Y". The conclusion was not about tasks as much as capabilities / capacities, so it's actually not a great match for the conclusion. Also, the evidence half of this answer is talking about how well we "understand a computer's ability to perform a task". That doesn't really match with our evidence, which never once mentions understanding. Our evidence was only saying "modeling X on a computer is much easier", not "we understand how computers are able to perform X better".

  3. Unrelated to Goal1% picked this

    A computer’s defeat of a chess champion should count as an indication that the computer

    Since this answer has no language that would allow you to use this rule and judge which thing we understand better, it's of no use to us.

  4. Correct65% picked this

    The less difficult it is to construct a computer model of a process the better

    Why this is right

    This is similar to (B), but it has a better match for our Evidence language and our Conclusion language. The argument was thinking Since computer modeling analytical tasks is far easier than computer modeling sensory tasks, we can conclude that we understand analytical processes better than sensory processes. This answer is saying, "The easier it is to construct computer models of X, the better we understand X", so this gives us a great bridge from the launching pad in the first sentence to the landing zone in the conclusion.

    Skill tested: Principle-Strengthen · how this choice captures the argument's function is the move to repeat next time.

  5. Unrelated to Goal3% picked this

    We should not underestimate the usefulness of computer modeling to the study

    Since this answer has no language that would allow you to use this rule and judge which thing we understand better, it's of no use to us.

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