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Answer: Corpus callosum
Why: The corpus callosum contains over 200 million axonal projections, facilitating rapid communication between hemispheres.
Answer: Pupil dilation
Why: Pupil dilation is a direct, physiological marker of the mental effort and cognitive load a person is currently experiencing.
Answer: Prefrontal cortex
Why: In 1848 an iron rod shot through railroad foreman Phineas Gage's left frontal lobe; he survived, but friends said he was 'no longer Gage'.
Answer: Forgetting curve
Why: Ebbinghaus tested his recall using thousands of nonsense syllables like 'WID' and 'ZOF' to avoid preexisting associations.
Answer: Training rapid filtering
Why: Action games force players to rapidly filter out distractions, sharpening peripheral vision and target-tracking abilities.
Answer: Thicker anterior cingulate
Why: Postmortem work found superagers pack unusually dense von Economo neurons into that cingulate region, alongside very few Alzheimer-type tangles.