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Human Brain Found to Operate in 11 Dimensions

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1 Human Brain Found to Operate in 11 Dimensions on Mon Jun 26, 2017 8:11 am



Human Brain Found to Operate in 11 Dimensions
June 26, 2017

“We found a world that we had never imagined, said Henry Markram, director of Blue Brain Project. “There are tens of millions of these objects even in a small speck of the brain, up through seven dimensions. In some networks, we even found structures with up to eleven dimensions.”
Swiss Scientists studying the brain using an advanced mathematical system have discovered that it operates on up to 11 different dimensions, creating multiverse-like structures. The researchers were able to uncover architectural structures that appears when the brain has to process information, before they disintegrate into nothing.
The findings suggest that when we examine brain activity with low-dimensional representations, we only get a shadow of the real activity taking place. This means we can see some information, but not the full picture. “So, in a sense our discoveries may explain why it has been so hard to understand the relation between brain structure and function,” explains Swiss scientist Karen Hess, Associate Professor in Life Sciences and Mathematics in the Schools of Life Sciences at EPFL.
Their findings, published in the journal Frontiers in Computational Neuroscience, reveals the hugely complicated processes involved in the creation of neural structures, potentially helping explain why the brain is so difficult to understand and tying together its structure with its function. The researchers focused on the neural network structures within the brain using for the first time, algebraic topology—a system used to describe networks with constantly changing spaces and structures.
The team, led by scientist Hess and colleagues at the EPFL, Switzerland, were carrying out research as part of the Blue Brain Project—an initiative to create a biologically detailed reconstruction of the human brain. Working initially on rodent brains, the team used supercomputer simulations to study the complex interactions within different regions, performing multiple tests on virtual brain tissue to find brain structures that would never appear just by chance. They then carried out the same experiments on real brain tissue to confirm their virtual findings.
“Algebraic topology is like a telescope and microscope at the same time. It can zoom into networks to find hidden structures—the trees in the forest—and see the empty spaces—the clearings—all at the same time,” study author Kathryn Hess said in a statement.
The EPFL team discovered that when they presented the virtual tissue with stimulus, groups of neurons form a clique, with up to 11 different dimensions. Each neuron connects to every other neuron in a very specific way to produce a precise geometric object. The more neurons in a clique, the higher the dimensions. The structures assembled formed enclosures for high-dimensional holes that the team have dubbed cavities. Once the brain has processed the information, the clique and cavity disappears.

The left shows a digital copy of a part of the neocortex, the most evolved part of the brain. On the right is a representation of the structures with different dimensions. The black hole in the middle symbolizes a complex of multi-dimensional spaces, or cavities. (Project Blue Brain)
“The appearance of high-dimensional cavities when the brain is processing information means that the neurons in the network react to stimuli in an extremely organized manner,” said EPFL researcher, Ran Levi.
“It is as if the brain reacts to a stimulus by building then razing a tower of multi-dimensional blocks, starting with rods (1D), then planks (2D), then cubes (3D), and then more complex geometries with 4D, 5D, etc. The progression of activity through the brain resembles a multi-dimensional sandcastle that materializes out of the sand and then disintegrates,” he said.
The findings indicate the brain processes stimuli by creating these complex cliques and cavities, so the next step will be to find out whether or not our ability to perform complicated tasks requires the creation of these multi-dimensional structures.
By using algebraic topology, Hess says, the team was able to discover “the highly organized structure hidden in the seemingly chaotic firing patterns of neurons, a structure which was invisible until we looked through this particular mathematical filter.”
“The stereotypical response pattern that we discovered indicates that the circuit always responds to stimuli by constructing a sequence of geometrical representations starting in low dimensions and adding progressively higher dimensions, until the build-up suddenly stops and then collapses: a mathematical signature for reactions to stimuli.
“In future work we intend to study the role of plasticity—the strengthening and weakening of connections in response to stimuli—with the tools of algebraic topology. Plasticity is fundamental to the mysterious process of learning, and we hope that we will be able to provide new insight into this phenomenon,” she added.
The Daily Galaxy via Newsweek, Frontiers in Computational Neuroscience, EPFL

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