Which test assesses cognitive flexibility?

• A. Tower of Hanoi
• B. Stroop
• C. Wisconsin Card Sorting
• D. Bechara's Gambling Task

Answer: (C)

Cognitive flexibility is the ability to adapt thinking and behavior when rules change or when feedback indicates the current approach isn’t effective. The Wisconsin Card Sorting Test is built to measure exactly that adaptability. In this task, you don’t get told the sorting rule upfront. You sort cards by color, shape, or number and you receive feedback on whether your choice is correct. After a while, the rule unexpectedly shifts to another dimension, and you must recognize the change, inhibit sticking with the old rule, and figure out and switch to the new rule. People who can shift smoothly show strong cognitive flexibility, while perseveration or difficulty shifting signals a specific deficit in this area.

Tower of Hanoi mainly taps planning and problem-solving with working memory, not the flexible rule-shifting aspect. The Stroop task isolates the ability to inhibit a prepotent response and manage interference, which is about inhibitory control rather than switching strategies. Bechara’s Gambling Task examines decision-making under ambiguity and reward processing, not the capacity to shift between abstract sorting rules.