Reading ComprehensionDifficulty: Hard

PT148 S2 P4 Q23 Explanation

Brain Scans

A free, expert breakdown of this official LSAT Reading Comprehension question.

TopicsParagraph PurposeScience

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Passage

There are some basic conceptual problems hovering about the widespread use of brain scans as pictures of mental activity. As applied to medical diagnosis (for example, in diagnosing a brain tumor), a brain scan is similar in principle to an X-ray: it is a way of seeing inside the body. Its value are instantiated in localized brain regions. This premise is known as the modular theory of mind.

It may in fact be that neither mental activity, nor the physical processes that constitute it, are decomposable into independent modules. Psychologist William Uttal contends that rather than distinct entities, the various mental processes are likely to be properties of a more general mental activity that is distributed throughout the brain. It so for a reason. To cleanly separate emotion from reason-giving makes a hash of human experience.

But if this critique of the modular theory of mind is valid, how can one account for the fact that brain scans do, in fact, reveal well-defined areas that “light up” in response to various cognitive tasks? In the case of functional magnetic resonance imaging (fMRI), what you are seeing when you remains after the subtraction represents the metabolic activity associated solely with the cognitive task in question.

One immediately obvious (but usually unremarked) problem is that this method obscures the fact that the entire brain is active in both conditions. A false impression of neat functional localization is given by differential brain scans that subtract out all the distributed brain functions. This subtractive method produces striking images of the it is illustrated so well by the products of the subtractive method?

What this question is testing

Paragraph Purpose

Your task

Pin down exactly what the question asks about the passage — a detail, the author's view, the structure, or the main point — before looking at the choices.

Common trap

Answers that restate a true detail from the passage but don't answer the specific question being asked.

Winning move

Anticipate the answer in your own words from the passage, then find the choice that matches that prediction.

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

The question
23.

A central function of the final paragraph of the passage

Answer choices

  1. Wrong Objection14% picked this

    criticize the research results described in the third paragraph on the grounds that they are incompatible with the basic premise

    Wrong Objection: results vs. method Too Strong: incompatible The author criticizes the research method described in the 3rd paragraph on the grounds that it gives off a misleading impression. The author never says that any results contradict ("are incompatible with") the basic premise of the modular theory.

  2. Opposite, if anything6% picked this

    suggest that the position articulated in the first paragraph needs to be modified to accommodate the results outlined

    The author is saying that the position articulated in the first paragraph only seems plausible because of the results outlined in the third paragraph: isn't the modular theory of mind ultimately attractive because it is illustrated os well by the products (results) of the subtractive method? So the author is basically doing the opposite of saying the results in the 3rd suggest a need to modify the position in the 1st. Instead, the author is saying the results in the 3rd are sort of cherry-picked to align perfectly with the position in the 1st.

  3. Out of Scope: outdated5% picked this

    contend that the research method detailed in the third paragraph relies upon an outdated theoretical model described

    The author contends that the research method detailed in the 3rd paragraph gives off misleading results that are the primary support for the modular theory of the mind (presented in the 1st). There isn't any theoretical model described in the 2nd paragraph, let alone an "outdated one". The 2nd paragraph is where the author and Uttal express some skepticism about the modular theory from the 1st.

  4. Out of Scope: inadequacy of views12% picked this

    argue that the empirical research outlined in the third paragraph points to the inadequacy of the competing views described

    The author seems to hold the same view as Uttal, in the 2nd paragraph, so there's no reason the author in the 4th paragraph would be trying to show that her own view from the 2nd paragraph is inadequate. Nothing in the last paragraph talks about two views. It's just saying, "the subtractive method gives off misleading results, and since the modular theory is mainly attractive because of these misleading results, doesn't that tell us something (about how modular theory is probably not right)?"

  5. Correct63% picked this

    show why the type of empirical evidence discussed in the third paragraph does not defeat the argument presented

    Why this is right

    This is the closest match we get for what we wanted. The last paragraph is where the author mentions a problem with the subtractive method brain scans and then relates that back to the modular theory. The 2nd paragraph is saying ... whoa, whoa, whoa, Modular Theory, we don't think that mental life is neatly compartmentalized into different regions. The 3rd paragraph begins, "If this critique of modular is valid, then how can you account for the fact that brain scans do reveal well-defined areas that light up depending on the activity?" The 4th paragraph is saying, "We can account for it by reminding you that the subtractive method used in these brain scans is hugely misleading. By design, it will give off the false impression of neat localization." So there! Our objections from the 2nd paragraph still stand. We don't trust this modular theory, and we aren't persuaded by these brain scans that are rendered in a way that artificially makes the modular theory look more correct than it is.

    Skill tested: Paragraph Purpose · how this choice captures the passage's function is the move to repeat next time.

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