Logical ReasoningDifficulty: Medium

PT149 S3 Q13 ExplanationScience cannot adequately explain

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

TopicsSufficient Assumption

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Stimulus

Science cannot adequately explain emotional phenomena such as feeling frustrated, falling in love, or being moved by a painting. Since they cannot be explained by physics, must not be physical phenomena.

What this question is testing

Sufficient Assumption

Your task

Find the assumption that, if added, guarantees the conclusion follows.

Common trap

Answers that only partly bridge the gap, leaving the conclusion unproven.

Winning move

Identify the new term in the conclusion and pick the choice that links it to the evidence.

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

The question
13.

The conclusion follows logically if which one of the following

Answer choices, explained

  1. Illegal Reversal17% picked this

    Whatever is not a physical phenomenon cannot be explained

    The word whatever is a sufficient indicator, because it refers to a universal, a categorical statement. Whatever, whenever, whoever, wherever, etc. would all be sufficient indicators. So this answer says: If not a physical ? can't be explained phenomena by science We'd love to have the reversal of that, because that could be a correct answer. But this is nothing. Any time an answer puts the Conclusion into the trigger, it's wrong. The conclusion always has to match the right side, the Outcome, of the conditional.

  2. Unrelated to Goal0% picked this

    Nothing that can be felt by only one subject can be

    This isn't providing any proving mechanism with the words (or idea) "not physical phenomena", so it's functionally hopeless. We will only be able to derive that something is not a physical phenomena if we find an answer that defines some necessary trait of physical phenomena.

  3. Unrelated to Goal1% picked this

    Physics, chemistry, and neurophysiology have similar

    This isn't providing any proving mechanism with the words (or idea) "not physical phenomena", so it's functionally hopeless. We will only be able to derive that something is not a physical phenomena if we find an answer that defines some necessary trait of physical phenomena.

  4. If-Conclusion5% picked this

    Whatever is not a physical phenomenon is an

    The word whatever is a sufficient indicator, because it refers to a universal, a categorical statement. Whatever, whenever, whoever, wherever, etc. would all be sufficient indicators. So this answer says: If not a physical ? then an emotional phenomena phenomena We'd love to have the reversal of that, because that could be a correct answer. But this is nothing. Any time an answer puts the Conclusion into the trigger, it's wrong. The conclusion always has to match the right side, the Outcome, of the conditional.

  5. Correct76% picked this

    Every physical phenomenon can be explained by physics, chemistry,

    Why this is right

    Like most correct answers on Sufficient Assumption, we have to contrapose it to understand why it works. As stated, the universal word every would mean the rule looks like this: Physical ? can be explained by phys, phenomenon chem, or neurophysiology The contrapositive perfectly matches the move from the premise (Since) to the conclusion. cannot be explained by phys, ? not physical chem, or neurophysiology phenomenon We know that human emotions can't be explained by Phys / Chem / Neuro, and so according to this rule, human emotions are not physical phenomena.

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

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