Jones is studying brain changes during adolescence. In looking at MRIs of people age 12 and people age 18, he should expect that the 12-year-olds will have ______ gray matter and _______ white matter in their brains, compared to the 18-year-olds.
A) more; more
B) less; less
C) more; less
D) less; more

Question

Quizplus · Accepted Answer

MRI studies show that the volume of gray matter increases in childhood, peaking in girls at about age 9½ and in boys at about age 10½. After these peaks, the volume of gray matter decreases up to adulthood, leveling off at about age 25. The volume of white matter increases, perhaps up to age 40.

Jones Is Studying Brain Changes During Adolescence