Approximately how many neurons remain at birth after pruning from 28 billion to 23 billion?

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Multiple Choice

Approximately how many neurons remain at birth after pruning from 28 billion to 23 billion?

Explanation:
The idea being tested is that the brain overproduces neurons before birth and then prunes some away, leaving a smaller, efficient network. From about 28 billion neurons before pruning, roughly 23 billion remain after pruning around birth. So the count at birth after pruning is approximately 23 billion. If it were 28 billion, pruning wouldn’t have reduced the number; 15 billion would mean far more pruning than is typical; 50 billion would exceed the original production.

The idea being tested is that the brain overproduces neurons before birth and then prunes some away, leaving a smaller, efficient network. From about 28 billion neurons before pruning, roughly 23 billion remain after pruning around birth. So the count at birth after pruning is approximately 23 billion. If it were 28 billion, pruning wouldn’t have reduced the number; 15 billion would mean far more pruning than is typical; 50 billion would exceed the original production.

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