Logical ReasoningDifficulty: Medium

PT124 S1 Q24 Explanation

People perceive color by means

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

TopicsParadox

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Stimulus

People perceive color by means of certain photopigments in the retina that are sensitive to certain wavelengths of light. People who are color­ blind are unable to distinguish between red and green, for example, due to an absence of certain photopigments. What is difficult to explain, however, is that in a study shades of red that the majority of the subjects were able to distinguish.

What this question is testing

Paradox

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
24.

Each of the following, if true, helps to explain the result of the study

Answer choices

  1. Possible Explanation5% picked this

    People with abnormally low concentrations of the photopigments for perceiving red can perceive fewer shades of red than

    This is an alternative to the absence of certain photopigments. It suggests that abnormally low concentrations of the photopigments for perceiving red are the issue.

  2. Possible Explanation7% picked this

    Questions that ask subjects to distinguish between different shades of the same color are difficult to

    This is an alternative to the absence of certain photopigments. It suggests that the study's ability to ask clear questions is the issue.

  3. Possible Explanation5% picked this

    Some people are uninterested in fine gradations of color and fail to notice or report differences they

    This is an alternative to the absence of certain photopigments. It suggests that people sometimes simply fail to notice or report the difference between fine gradations of color.

  4. Correct79% picked this

    Some people are unable to distinguish red from green due to an absence in the retina of the

    Why this is right

    This is about distinguishing red from green. What needs to be explained is why people failed to distinguish between different shades of red.

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

  5. Possible Explanation4% picked this

    Some people fail to report distinctions between certain shades of red because they lack the

    This is an alternative to the absence of certain photopigments. It suggests that vocabulary is the issue.

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