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Difficulty: Very hardDeciphering Meaning via Structural Clues and Contrast/Continuation Signals

Early cognitive scientists modeled mental processes as discrete, modular computations that operated with frictionless efficiency; nevertheless, neuroimaging studies demonstrate that working memory tasks severely tax prefrontal neural networks. Far from executing routines effortlessly, the brain expends substantial metabolic resources during complex reasoning, consuming glucose at rates that scale directly with task difficulty. Indeed, this metabolic burden reveals that executive control is an energetically constrained system rather than an uninhibited processor.

In the context of the passage, the word "tax" most nearly means:

  1. A
    levy
  2. strainAnswer
  3. C
    accuse
  4. D
    evaluate
  5. E
    invigorate

Answer

The word "tax" in this context means to strain or place heavy demands upon.
The passage establishes a direct structural contrast using the transition signal 'nevertheless' between early models of 'frictionless efficiency' and the actual operation of neural networks. The subsequent elaboration ('Far from executing routines effortlessly... expends substantial metabolic resources') and continuation signal ('Indeed, this metabolic burden...') confirm that 'tax' means to strain, burden, or demand heavy exertion from the prefrontal networks.

Step-by-Step Solution

1
Identify the target word and surrounding structural signals in the passage.
The target word "tax" appears after the pivot signal "nevertheless", which sets up a contrast with "frictionless efficiency".
Contrast signals indicate that the clause containing the target word must express an idea opposite to effortless, frictionless operation.
2
Analyze continuation signals and restatements in subsequent sentences.
The text states "Far from executing routines effortlessly, the brain expends substantial metabolic resources" and refers to "this metabolic burden".
Elaboration markers ("Far from...") and continuation markers ("Indeed...") explicitly define the effect of taxing neural networks as imposing a heavy resource demand or burden.
3
Evaluate the answer options against the derived contextual meaning.
The definition "strain" directly reflects the concept of imposing a heavy metabolic burden and demanding effort.
Choosing "strain" resolves both the contrast with frictionless efficiency and the alignment with metabolic expenditure.

Key Concept

Deciphering Vocabulary Meaning via Structural Contrast and Continuation Signals
Estimated Time:2m 0s
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Topics

Deciphering Meaning via Structural Clues and Contrast/Continuation Signals

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