Logical ReasoningDifficulty: Hard

PT129 S1 Q18 Explanation

Asked by researchers to sort objects

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

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Stimulus

Asked by researchers to sort objects by shape, most toddlers in a large study had no trouble doing so. When subsequently told to sort by color, the toddlers seemed to have difficulty following the new rule and almost invariably persisted with their first approach. The researchers suggest such failures to adapt to new rules, yet is slow to mature, continuing to develop right into adolescence.

What this question is testing

Most Supported

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
18.

Which one of the following is most supported by the

Answer choices

  1. Unsupported Comparison / Opposite9% picked this

    Toddlers unable to sort objects by color tend to have a less developed prefrontal cortex than other children

    According to these researchers, almost all toddlers would be likely to have an undeveloped prefrontal cortex, not just these ones in the study who couldn’t follow the second rule. The toddlers who couldn't follow the second rule aren't considered the atypical. They are presented as though they are behaving typically for children of that age.

  2. Too Strong: "only"3% picked this

    Only adolescents and adults can solve problems that require adapting to

    “Only” is overly restrictive. If there is a toddler or even like an 8 year old (not yet an adolescent) who can solve a problem that requires adapting to new rules, it doesn’t contradict anything in this paragraph. Even the language of “almost invariably” in the second sentence suggests that some toddlers were able to follow the new rule.

  3. Correct53% picked this

    Certain kinds of behavior on the part of toddlers may not

    Why this is right

    This tortured phrasing allows us to reinforce the Causal Difference-Maker. How come the toddlers in the study seemed to disobey the new rule? Were they willfully trying to resist what the researchers asked them to do? No, according to the researchers, the toddlers just had difficulty following the new rule because of their stage of brain development. The toddlers are disobeying the new rule, but not because they’re choosing willfully to do so, rather because their brains aren’t letting them follow the new rule.

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

  4. Trap2% picked this

    The maturing of the prefrontal cortex is more important than upbringing in causing the development

    Unsupported Comparison "more important" / Out of Scope: “upbringing” We have no information about the influence of upbringing on adaptive behavior. We know that failures to adapt are often caused by an immature cortex, but they might be even more often caused by certain types of upbringing.

  5. Too Strong33% picked this

    Skill at adapting to new situations is roughly proportional to the level of development of

    Too Strong: “roughly proportional” / Out of Scope: “skill” “new situations” Even though it says “roughly”, saying that “A is proportional to B” is a very strong stepladder connection: more development of prefrontal, more skill at adapting to new situations. We don’t have grounds to infer that sort of relationship. It could be more of a binary off/on type thing; once the prefrontal cortex reaches a certain level of development, people have the ability to adapt. That would not be proportional. That would just mean there’s a minimum threshold before an ability is possible. Also, it’s drifting too much to conflate whether the toddlers were able to adapt to a new rule with their skill at adapting to new situations.

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