Human brains grow and develop at different rates compared to other species. At approximately what age does the human brain reach 95% of the adult size?

Question

BlackTom AI · Accepted Answer

Question focus: determining when the human brain reaches about 95% of its adult size relative to other species and developmental benchmarks.
Option a: 'a. 6 months to 1 year' This range represents early infancy, a period of rapid growth but far from the 95% adult brain size milestone. At this stage the brain is growing quickly, yet still well below the 95% mark, which occurs later.
Option b: 'b. 6-7 years' This choice aligns with the established developmental literature indicating that by around 6 to 7 years of age, the human brain has reached roughly 95% of its adult size. During early childhood, synaptic pruning and maturation proceed, and gross brain volume approaches adult proportions, making this the most plausible date range for the 95% milestone.
Option c: 'c. 3-4 years' While significant brain growth occurs in this window, it is generally before the brain attains 95% of adult size. The 3- to 4-year period corresponds to substantial development, but the 95% threshold is typically not reached yet.
Option d: 'd. 13-15 years' This adolescence window involves continued brain maturation and refinement, including synaptic pruning and myelination changes, but by this stage the brain has already surpassed the 95% size benchmark well before adolescence and continues more with structure refinement than mass increase.
In summary, option b most accurately reflects the typical point at which the human brain attains about 95% of its adult size, while the other options either denote earlier phases with significantly smaller brain volumes or later periods where size plateau effects have already occurred.

DEV3022 S2 2025 Quiz 1

Human brains grow and develop at different rates compared to other species. At approximately what age does the human brain reach 95% of the adult size?

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