Final answer:
The myelination of axons in the brain does not stop during middle childhood. Myelination continues throughout childhood and adolescence, increasing the speed of nerve impulse transmission.
Step-by-step explanation:
The myelination of axons in the brain does not stop during middle childhood. In fact, myelination continues throughout childhood and adolescence. Myelination is the process of forming a protective layer of myelin around the axons, which increases the speed of nerve impulse transmission. While the myelination process is more rapid during early childhood, it does not completely stop during middle childhood.
For example, the white matter in the cerebrum, which consists of myelinated axons, continues to increase during childhood and adolescence. MRI images of the brains of people from 5 to 20 years of age show the development of white matter during this period.
Therefore, it is not accurate to say that myelination of axons in the brain stops during middle childhood.