Logical ReasoningDifficulty: Medium

PT115 S4 Q1 Explanation

A study comparing infant care

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

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Stimulus

A study comparing infant care revealed that the amount of stimulation babies receive affects their sleep. At six months of age, the babies in the study with a less stimulating daytime routine slept an average of two hours more per day than those with a more stimulating routine. Since sleep plays a be wise to reduce the amount of stimulation their babies receive.

What this question is testing

Weaken

Your task

Find the choice that makes the argument's conclusion less likely to be true.

Common trap

Answers that look negative but attack a claim the argument never relied on.

Winning move

Find the assumption the argument depends on, then pick the choice that undermines it.

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

The question
1.

Which one of the following statements, if true, most seriously weakens

Answer choices

  1. No Impact2% picked this

    Babies’ muscular coordination is unaffected by the amount of stimulation

    This suggests that muscular coordination in babies is unaffected by stimulation, which doesn’t address the balance between sleep and other developmental factors, nor does it challenge the conclusion on reducing stimulation.

  2. No Impact12% picked this

    Babies with less stimulating routines usually get extra sleep during

    This states that babies with less stimulating routines get more sleep during the day, which supports the study's finding and conclusion rather than challenging it.

  3. No Impact5% picked this

    Studies showed no correlation between stimulation and amount of sleep for children three years of

    This notes the lack of correlation between stimulation and sleep for older children, but the argument specifically concerns infants, making this observation irrelevant to the conclusion.

  4. No Impact2% picked this

    The babies who had a less stimulating routine gained weight at

    This claims that babies with a less stimulating routine gained weight at an average rate. It neither supports nor challenges the crucial aspect of the argument concerning developmental aspects influenced by sleep versus stimulation.

  5. Correct79% picked this

    The stimulation that babies receive helps them to

    Why this is right

    This states that stimulation aids intellectual development in babies, presenting a significant benefit of stimulation that may outweigh the sleep considerations proposed. It challenges the notion that reducing stimulation is wise by introducing a valuable aspect of stimulation beyond sleep.

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

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