Logical ReasoningDifficulty: Medium

PT140 S1 Q14 Explanation

Some philosophers explain visual

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

TopicsParallel

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Stimulus

Some philosophers explain visual perception by suggesting that when we visually perceive an object, a mental image of that object forms in our mind. However, this hypothesis cannot be correct, since it would require an inner self visually perceiving the newly formed mental image; this would in turn require that the inner and so on. But such an infinite regress is absurd.

What this question is testing

Parallel

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
14.

Which one of the following arguments is most similar in its pattern of reasoning to

Answer choices

  1. Weak Premise Match7% picked this

    According to some linguists, many of the world's languages can be traced back to a common source known as Inda-European. However, Inda-European cannot be

    This does have a rebuttal conclusion, and it does have an "implications of logic" beginning to its evidence. However, instead of saying "If Inda-European were the first language, then there would be an absurd chain of requirements", it says "If it were first, there would be an unlikely consequence that we have overwhelming evidence against."

  2. Weak Premise Match4% picked this

    The claim that any scientific theory is adequate as long as it agrees with all the empirical data cannot be correct. For there are

    There is a rebuttal conclusion, but the evidence doesn't follow an "implications of logic" trajectory; meaning, it never says "if that view were true, then A would be true" or "but that view requires A". The argument is implicitly arguing with the implications of the claim, but the implications lead to a contradiction, not absurdity (the infinite regress of mental images and inner viewers wasn't a contradiction, it was just a silly thought that isn't likely to be true).

  3. Correct78% picked this

    Some historians claim that no theory is ever genuinely new; no matter how clever a theory is, there is always a precedent theory that

    Why this is right

    This has the rebuttal conclusion, and evidence saying that the implications of the view we're rejecting would be an infinite regress that is absurd. If every theory has a theory that it borrowed heavily from, then how do you ever explain "the 1st theory". If visual perception is really just a mental image forming in our mind, and then we have to visually perceive that mental image, then how does it ever end?

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

  4. Trap8% picked this

    Some engineers define a structure's foundation as that part of the structure that supports the rest of the structure. This definition is unfortunate, however,

    Bad Conclusion/Premise Match Word Trap: absurd This conclusion isn't quite a rebuttal; it's not saying "this definition is untrue / incorrect". It's saying the definition is unfortunate. And the evidence doesn't have anything to do with, "if it were true, it would lead to an infinite loop". It's more like, "this definition gives off a misleading impression".

  5. Bad Premise Match3% picked this

    Some people claim that the first library was the library of Alexandria, which for many centuries contained the largest collection of books in the

    This argument does reject a claim in its conclusion, but its evidence does not sound like, "If the claim were true, an absurd infinite loop would result". Instead, the evidence says, "This claim is not accurate. We know things that make it inaccurate."

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