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Hypothesis 11

Extended brain growth

Round Tower, Machu Picchu, Peru
Round Tower, Machu Picchu, Peru


In humans, brain growth is limited by the width of the woman’s birth canal, through which the child must pass at birth. The selective advantage of an individual having a large brain reaches a natural limit here.

To overcome this natural limitation, evolution has found two solutions in human beings: The first solution is to prolong brain growth into the post-natal period. This solution is acquired by a further increase in effort because of the required and time-consuming care of the helpless infant.

Explanation:

Why, during the course of evolution, does the human brain simply stop growing? This question is just as fascinating as the question related to the causes of growth in previous periods. Surprisingly, it does not get discussed very much.

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