One type of structural change in the brain has to do with changes in the levels of gray and white matter in the brain. Which of the following statements is true?

One type of structural change in the brain has to do with changes in the levels of gray and white matter in the brain. Which of the following statements is true?

• A. Gray matter decreases while white matter increases.
• B. Gray matter increases while white matter decreases.
• C. Both gray matter and white matter decrease.
• D. Both gray matter and white matter increase.

Answer: (A)

The statement that gray matter decreases while white matter increases accurately reflects observed trends in brain development. As individuals age, particularly through adolescence into early adulthood, there is a trend of gray matter volume (which consists mainly of neuronal cell bodies and is associated with processing and cognition) decreasing due to synaptic pruning and maturation processes. In contrast, white matter (which consists primarily of myelinated axons and facilitates communication between different brain regions) tends to increase during this period. This increase in white matter is associated with improved cognitive functions and processing speed as neural connections become more efficient through myelination.

Understanding these changes is crucial in the context of human development, particularly in the realms of cognitive and emotional growth, as well as how these changes impact learning and behavior during critical developmental stages.