Increase in brain weight during the preschool years is due to the:

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Quizplus · Accepted Answer

The increase in brain weight during the preschool years is primarily due to continuing myelination of nerve fibers, which leads to more efficient communication between neurons. Other factors, such as increases in cortical synaptic density and dendritic branching, are also likely to contribute, but myelination is the most significant factor. The increase in thickness of the skull is not a major contributor to brain weight changes, as it is a relatively slow process compared to neural development. The spinal cord and medulla are also not major contributors to changes in brain weight during this period.

Increase in Brain Weight During the Preschool Years Is Due