Logical ReasoningDifficulty: Hard

PT148 S3 Q12 Explanation

Humans' emotional tendencies are

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

TopicsNecessary Assumption

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Stimulus

Humans' emotional tendencies are essentially unchanged from those of the earliest members of our species. Accordingly, although technology makes possible a wider range of individual and societal choices than generally unable to choose more wisely.

What this question is testing

Necessary Assumption

Your task

Find the assumption the argument requires in order for its conclusion to hold.

Common trap

Answers that would help the argument but aren't strictly required (sufficient, not necessary).

Winning move

Negate each choice — the right one breaks the argument when negated.

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

The question
12.

The argument depends on assuming which one of

Answer choices

  1. Too Strong: no significant changes6% picked this

    Humans have undergone no significant changes since the origin of

    Just because our emotional tendencies haven't changed doesn't mean the author is assuming NOTHING has changed.

  2. Out of Scope9% picked this

    Humans who make wise choices are generally in control of

    Out of Scope: in control of emotions We never discuss being "in control" of our emotions. The author isn't revealing her opinion on how wise we were, or how wise we are. She's just saying, "since emotional tendencies haven't changed, ability to choose wisely hasn't changed".

  3. Out of Scope3% picked this

    Human history cannot make humans any wiser unless humans are emotionally disposed to heed the

    Out of Scope: disposed to heed lessons Nothing in this argument is talking about whether or not humans have the emotional disposition to take to heart the lessons of history. We aren't talking about learning from history's lessons at all.

  4. Too Strong: choose on emotions alone26% picked this

    Regardless of the range of choices available to humans, they choose on the basis of

    The author has not committed herself to this crazy-extreme idea that every human chooses on the basis of emotions alone. She's just saying "whatever influence/tendencies emotions had for early humans is similar to what they have today", and then concluding "our ability to choose wisely must have stayed the same". All this assumes is that "ability to make wise choices is affected by / dependent on our emotional tendencies in some way". It doesn't assume that all humans make every decision based only on emotions.

  5. Correct56% picked this

    Humans would now be able to make wiser choices than in centuries past only if an essential change had taken

    Why this is right

    When Necessary Assumption answers are in conditional form, we can just diagram them and figure out whether they match the argument core: only if = right side Humans able to make → essential change took wiser choices place in emotional dispositions Since we always compare these conditionals to the argument in "IF Premise, THEN Conclusion" form, we'll need to contrapose this so that we can get the right side of the arrow to be talking about whether humans are able to make wiser choices (since that was the Conclusion.) Contrapositive: no essential change humans won't be able to humans' emotional → to make wiser choices dispositions than in centuries past Does that match the argument? Yes, perfectly! The left side matches the premise, and the right side matches the conclusion.

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

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