Evolutionary Brain Development

Evolutionary brain development theories have changed as scientists better understand brain structure, chemistry, and function. An outmoded theory, called the Triune Theory, prevailed through the 20^th century. A more useful and plausible theory of how the brain works integrates accurate knowledge of the brain, suggesting the brain was first necessary for basic adaptation, survival, and propagation. From there, interdependent brain networks evolved to increase adaptation, survival, and propagation. The modern brain uses interoceptive and exteroceptive information to predict future conditions and needs — enabling optimal adaptation to constantly changing internal/external environments.