What happens in brain development after the peak of synaptic density about age 3?
a. The frequently used connections become faster and more efficient and underused connections wither away.
b. Most of the connections become faster and more efficient leading to the production of more connections.
c. About 75 percent of the synapses in the frontal cortex wither away because they are no longer used.
d. After the peak at 3, the growth rate of synapses is largely dependent on how much parents talk to their children.
Answer: A
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