Brain Shape Found to Influence Connectivity

In a study recently published in Nature, researchers from Monash University’s Turner Institute for Brain and Mental Health provided evidence against the long-held belief that the brain’s complex network of cellular connections is the primary driver of our thoughts, feelings, and behaviors. Instead, the study reveals that the overall shape of the brain exerts a far more significant influence on brain function than previously recognized. This discovery has profound implications for researchers and life scientists studying the complexities of the human brain.

Dr. James Pang and Professor Alex Fornito’s research team employed an interdisciplinary approach, integrating physics, neuroscience, and psychology to challenge the traditional understanding of brain connectivity. By analyzing over 10,000 maps of human brain activity, the researchers uncovered a previously unappreciated relationship between brain shape and activity.

“The work opens opportunities to understand the effects of diseases like dementia and stroke by considering models of brain shape, which are far easier to deal with than models of the brain’s full array of connections,” says Dr. Pang.

Ultimately, the study found that structured patterns of brain activity are excited throughout nearly the entire brain rather than being confined to specific regions. This challenges the conventional view that activity during different tasks occurs only in isolated areas of elevated activity.

For their work, the research team used magnetic resonance imaging (MRI) to study eigenmodes, representing the brain’s natural patterns of vibration or excitation. The eigenmodes derived from brain geometry, or geometric eigenmodes, proved to be more robust indicators of brain function than the previously studied complex interregional connectivity.

Additionally, the researchers confirmed their theoretical predictions by demonstrating that the close link between brain geometry and function is driven by wave-like activity propagating throughout the brain. 

As scientists delve deeper into the mysteries of the brain, this study offers a shift in focus from complex interregional connectivity to considering the brain’s shape when studying brain activity. By embracing this new understanding, scientists can revolutionize brain mapping and gain valuable insights into brain disorders.