Complete the text with the most logical and precise word.

Answer:Although the pathways of the human brain have long been considered highly rigid and unchangeable once adulthood is reached, recent neuroscientific discoveries have demonstrated that the adult brain retains a surprising degree of 【plasticity】, continually reorganizing its structure in response to learning and experience.

Answer

plasticity (or flexibility, malleability, adaptability)

The correct answer must mean the quality of being adaptable or able to change. The passage sets up a contrast between the historical view that brain pathways are 'rigid and unchangeable' and new discoveries showing that the brain 'continually reorganizes.' Therefore, a word like 'plasticity', 'flexibility', or 'malleability' precisely completes the text by denoting this capacity for change.

Step-by-Step Solution

Analyze the context of the sentence to identify the contrast being set up.

The sentence begins with the concession 'Although the pathways of the human brain have long been considered highly rigid and unchangeable,' which signals a contrast with the new discovery described in the main clause.

Understanding the transition word 'Although' is crucial to identifying that the missing word must mean the opposite of 'rigid' and 'unchangeable'.

Examine the clue provided at the end of the sentence to find a precise definition of the missing word.

The sentence ends by describing the brain as 'continually reorganizing its structure in response to learning and experience.'

This phrase directly defines the ability of the brain to change, adapt, or reorganize.

Select a high-utility academic noun that means the quality of being able to change, adapt, or be shaped.

The noun 'plasticity' (specifically 'neuroplasticity' in science contexts), 'flexibility', 'malleability', or 'adaptability' fits both grammatically and semantically.

These words directly oppose 'rigidity' and denote the capacity for change and reorganization.

Key Concept

Identifying a word that fits the context based on structural contrast and definition clues.

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