Brain complexity: very orderly connectome (Introduction)

by David Turell , Thursday, September 17, 2020, 00:30 (1529 days ago) @ David Turell

There is lots more white matter than grey matter in the brain. It is all the connecting axons and they are surprisingly orderly:

https://mindmatters.ai/2020/09/the-human-brain-has-given-researchers-a-big-surprise/

"Scientists have long thought that white matter didn’t play an active role in the brain, but new research has shown that this is untrue and that white matter actively affects both how the brain learns and how it dysfunctions.

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"But a new study suggests that our mental circuitry is more like Manhattan’s organised grid than London’s chaotic tangle. It consists of sheets of fibres that intersect at right angles, with no diagonals anywhere to be seen.

"Van Wedeen from Massachusetts General Hospital, who led the study, says that his results came as a complete shock. “I was expecting it to be a pure mess,” he says. Instead, he found a regular criss-cross pattern like the interlocking fibres of a piece of cloth.

"Wedeen’s maps may not reveal all the details about the brain’s network, but it does show how that network is structured. “If you look at brain connections in an adult human, it’s really a massive puzzle how something so complex can emerge,” says Behrens. “If we can establish any sort of organisation, we get a clue about how these things grow. If it obeys some rules, you could start to work out how it follows those rules. You have something to hang onto.”

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"Many surprises. Scientists have been amazed to see that, instead of chaos, the connecting fibers are organized into an orderly 3D grid, where axons run up and down and left and right, minus any diagonals or tangles. Science magazine compares the brain’s 3D layout to New York City, with its streets running in two directions and buildings’ elevators running up and down. Strangely, in flat areas of the grid, the fibers overlap at precise 90 degree angles and weave together much like a fabric, the scientists say.

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"while the healthy brain is a small-world network, the schizophrenic brain is measurably less so—it can still be organized into modules, but those modules aren’t as densely connected. If small-worldness helps the brain undertake a variety of processes effectively and efficiently, its lack in the schizophrenic brain could someday help to explain the disease’s symptoms."

Comment: this strict organization reeks of design. The comment on Schizophrenia simply tells us we have to use the brain we are given and make me more sure of dualism as I view it.