Evolution of Brain Regulation Preceded the Development of the Central Nervous System
Scientists have made a groundbreaking discovery that suggests the brain’s regulatory mechanisms existed long before the evolution of the central nervous system. The findings, published in the journal Nature Communications, suggest that primitive primitive organisms had an innate capacity to regulate their body functions, even without the sophisticated structure of a central nervous system. This suggests that the evolution of the brain was driven by the need to regulate body functions, rather than the other way around.
source: Phys.org