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American Focus > Blog > Tech and Science > Mapping the structure of the brain doesn’t fully explain its function
Tech and Science

Mapping the structure of the brain doesn’t fully explain its function

Last updated: September 29, 2025 4:49 am
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Mind

A recent comparison of two maps from a nematode worm—the connectome, which outlines neuron connections, and a map of neural signal paths—has unveiled surprising discrepancies, indicating that the brain’s structure alone may not fully elucidate its function.

By Karmela Padavic-Callaghan

The human brain features trillions of connections critical for its functions.

Sherbrooke Connectivity Imaging Lab/Connect Images/Alamy

Researchers aim to unravel the mysteries of brain function through comprehensive mapping of its structure. However, a recent study indicates that understanding the brain is far more intricate than merely acquiring a wiring diagram, or connectome.

Sophisticated research from Sophie Dvali and her team at Princeton University examined the connectome of the nematode worm Caenorhabditis elegans, comparing it against the neural activity observed when specific neurons were stimulated. This study was feasible due to the simplicity of the worm’s nervous system, comprised of approximately 300 neurons.

The nematode’s brain structure is simpler compared to humans, with just around 300 neurons highlighted here in green.

Heiti Paves / Alamy Stock Photo

By treating the connectome and neural signal data as mathematical networks, the researchers aimed to assess the correlation between neuron connectivity and signal exchange. Surprisingly, they found that high-density connections did not consistently correspond with active signal exchange.

Dvali noted that while some neuron groups responsible for specific actions—like feeding and backward movement—showed a strong correlation between connection density and signal exchange, this pattern did not universally apply. The analysis revealed significant discrepancies, prompting the conclusion that a brain’s connectome alone cannot fully predict its behavioral output.

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Team member Andrew Leifer highlighted that signaling between neurons might not always follow the most direct paths, and sometimes neurons could communicate in ways not captured by their physical connections. “While we often rely on the connectome in our research, the sheer number of connections sometimes necessitates more comprehensive information,” he stated.

Critically, Albert-LászlĂł Barabási of Northeastern University remarked on the ongoing debate regarding the limitations of connectomic data, emphasizing the current study’s endeavor to explore the interplay between structure and function.

Moving forward, the researchers plan to expand their analysis to understand how signals propagate through the connectome with simultaneous neuron stimulations. They also aim to explore more complex organisms such as the fruit fly larva, which boasts the most comprehensive whole-brain connectome documented to date. “We are currently witnessing a revolution in brain mapping,” Barabási concluded.

TAGGED:braindoesntExplainFullyfunctionMappingStructure
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