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Difficulty: MediumNecessary Assumption

Cognitive Scientist: In a recent study, subjects trained on an artificial language demonstrated significant improvement in detecting syntactically invalid sentence structures only when they were permitted to enter slow-wave sleep within four hours of instruction. Neurological monitoring during this sleep phase revealed a marked increase in synchronous electrical activity between the prefrontal cortex and the striatum, an interaction absent during both wakeful rest and other sleep stages. Therefore, the long-term consolidation of abstract grammatical rules depends upon synchronous prefrontal-striatal communication during slow-wave sleep.

Which one of the following is an assumption required by the cognitive scientist's argument?

  1. A
    Synchronous electrical firing between the prefrontal cortex and the striatum occurs whenever a human learner acquires any form of abstract conceptual knowledge.
  2. B
    Any individual who enters slow-wave sleep within four hours of language instruction will successfully consolidate abstract grammatical rules.
  3. The subjects' improved ability to detect invalid sentences was not solely attributable to their memorization of specific word combinations encountered during training.Answer
  4. D
    Synchronous neural communication between the prefrontal cortex and the striatum during wakeful rest is incapable of supporting non-linguistic cognitive tasks.
  5. E
    Slow-wave sleep is the only period during which the brain is capable of recovering from the cognitive fatigue induced by intensive study.

Answer

The subjects' improved ability to detect invalid sentences was not solely attributable to their memorization of specific word combinations encountered during training.
The conclusion claims that the observed neural activity consolidates 'abstract grammatical rules.' However, the evidence only shows that subjects became better at identifying invalid sentences. For the conclusion to hold, the test performance must reflect genuine rule acquisition rather than mere rote memorization of the surface-level word strings presented during training. If the performance was entirely due to memorizing specific word pairs, then abstract rule consolidation was never demonstrated, causing the argument to fail.

Step-by-Step Solution

1
Isolate the premises and conclusion of the argument.
Premise 1: Subjects improved at detecting syntactically invalid sentences only if they entered slow-wave sleep within four hours of training. Premise 2: Synchronous prefrontal-striatal communication increased during this sleep stage and did not occur during wakeful rest or other sleep stages. Conclusion: Consolidating abstract grammatical rules depends upon synchronous prefrontal-striatal communication during slow-wave sleep.
Deconstructing the argument structure reveals the conceptual leap between the observed experimental data and the final claim.
2
Identify the unstated logical gap between the evidence and the conclusion.
The premises measure 'detecting syntactically invalid sentences,' but the conclusion claims the consolidation of 'abstract grammatical rules.' The author assumes that detecting invalid sentences actually reflects rule consolidation rather than simple superficial recall of verbatim word sequences.
Necessary assumption questions often bridge a shift in scope between a specific test metric and a generalized conceptual conclusion.
3
Apply the Negation Test to verify necessity.
Negating the statement yields: 'The subjects' improved ability to detect invalid sentences was solely attributable to their memorization of specific word combinations encountered during training.' If true, the experiment tested rote lexical memory rather than abstract grammatical rules, directly refuting the conclusion that abstract rule consolidation was observed.
A required assumption, when logically negated, must fatally undermine the validity of the conclusion.

Key Concept

Necessary Assumption Identification via the Negation Technique
Estimated Time:1m 15s
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Topics

Necessary Assumption

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