Cambridge Study Reveals Five Brain Development Phases

Neuroscientists at the University of Cambridge have identified five distinct phases of structural development in the human brain, marked by key turning points at ages 9, 32, 66, and 83, according to a study published this week in Nature Communications. The research, which analyzed MRI diffusion scans from nearly 4,000 individuals aged from birth to 90, reveals how neural connections evolve over a lifetime, offering new insights into cognitive strengths and vulnerabilities at different stages.

The study mapped brain wiring by tracking water molecule movement through tissue, a method that highlights changes in connectivity between regions. Researchers, led by Dr. Alexa Mousley, a Gates Cambridge Scholar, and including Professor Duncan Astle of neuroinformatics, examined datasets from multiple neuroimaging projects. They focused on features like network efficiency, modularity, and global versus local communication to detect patterns of reorganization.

The first phase, from birth to around age 9, encompasses childhood. During this period, the brain rapidly grows gray matter, which processes information, and white matter, which transmits signals. Synapses—connections between...