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Difficulty: HardEvaluating Intermediate Conclusions

Neuroscientist: During REM sleep, the brain actively prunes synaptic connections formed during waking hours. This pruning process prevents the neural network from becoming oversaturated with trivial sensory data. Therefore, REM sleep is essential for maintaining long-term cognitive efficiency. Some researchers argue that slow-wave sleep is more critical than REM sleep because slow-wave sleep is directly responsible for memory consolidation. However, memory consolidation is ultimately ineffective if the brain's overall processing capacity is compromised by synaptic clutter. Thus, any comprehensive medical treatment for severe cognitive fatigue must prioritize the restoration of REM sleep cycles over deep, slow-wave sleep.

Which one of the following most accurately describes the role played in the neuroscientist's argument by the claim that REM sleep is essential for maintaining long-term cognitive efficiency?

  1. It is an intermediate conclusion that is derived from the observation about synaptic pruning and that, in turn, provides support for the argument's main conclusion.Answer
  2. B
    It is the overall conclusion of the argument, which is supported by the claim that memory consolidation is ineffective when processing capacity is compromised.
  3. C
    It is a foundational premise offered in support of the argument's main conclusion, and for which no further logical justification is provided within the argument.
  4. D
    It is an inference about cognitive efficiency that relies on outside assumptions regarding how memory consolidation functions during slow-wave sleep.
  5. E
    It is a viewpoint attributed to opposing researchers that the argument's main conclusion is explicitly designed to refute.

Answer

It is an intermediate conclusion that is derived from the observation about synaptic pruning and that, in turn, provides support for the argument's main conclusion.
The target statement acts as a logical bridge in the argument's structure. The indicator word 'Therefore' signals that it is a conclusion drawn from the preceding sentences regarding synaptic pruning and neural oversaturation. However, the argument does not stop there; it utilizes this established point about cognitive efficiency to counter an opposing view and ultimately justify its main conclusion regarding medical treatments for cognitive fatigue. Thus, it perfectly fits the definition of an intermediate conclusion.

Step-by-Step Solution

1
Analyze the structure of the stimulus to isolate the main conclusion.
The main conclusion is found in the final sentence: 'Thus, any comprehensive medical treatment for severe cognitive fatigue must prioritize the restoration of REM sleep cycles over deep, slow-wave sleep.'
Identifying the main conclusion provides the structural endpoint toward which all other supporting statements point.
2
Locate the target claim in the text and determine what supports it.
The target claim begins with 'Therefore'. It is directly supported by the first two sentences, which explain the mechanism of synaptic pruning during REM sleep.
If a claim is supported by other statements in the argument, it functions as a conclusion of some kind, ruling out the possibility that it is a foundational, unsupported premise.
3
Determine the relationship between the target claim and the main conclusion.
The target claim establishes why REM sleep is vital (maintaining cognitive efficiency), which is then used alongside the rebuttal about memory consolidation to prove the main conclusion (treatments must prioritize REM sleep).
Because the target claim is supported by premises and subsequently supports the final conclusion, its precise structural role is an intermediate (or subsidiary) conclusion.

Key Concept

Evaluating Intermediate Conclusions
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Topics

Evaluating Intermediate Conclusions

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