The Biology of Beliefs (Book Snippet 9)

The brain’s development begins soon after conception, reaching around 90% of its adult volume by the age of six, but continues to undergo significant structural changes until the age of 21 years and more subtle processes of restructuring continue until we die. How our adult brain turns out is dependent on nearly an infinite number of variables. The two big factors determining brain development are nature (our biology) and nurture (our socio-cultural experience). Researchers continue to argue about the relative relevance of these influencing factors, but roughly speaking they each seem to account for about 50% of the variance.

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