Brain's Wiring: More Like the Internet Than a Pyramid?
2010 08 15
New research suggests that the distributed network of the Internet may be a better model for the human brain than a top-down hierarchy.
The brain has been mapped to the smallest fold for at least a century, but still no one knows how all the parts talk to each other.
A study in Proceedings of the National Academy of Sciences answers that question for a small area of the rat brain and in so doing takes a big step toward revealing the brain's wiring.
The network of brain connections was thought too complex to describe, but molecular biology and computing methods have improved to the point that the National Institutes of Health have announced a $30 million plan to map the human "connectome."
The study shows the power of a new method for tracing brain circuits.
USC College neuroscientists Richard H. Thompson and Larry W. Swanson used the method to trace circuits running through a "hedonic hot spot" related to food enjoyment.
The circuits showed up as patterns of circular loops, suggesting that at least in this part of the rat brain, the wiring diagram looks like a distributed network.
Neuroscientists are split between a traditional view that the brain is organized as a hierarchy, with most regions feeding into the "higher" centers of conscious thought, and a more recent model of the brain as a flat network similar to the Internet.
"We started in one place and looked at the connections. It led into a very complicated series of loops and circuits. It's not an organizational chart. There's no top and bottom to it," said Swanson, a member of the National Academy of Sciences and the Milo Don and Lucille Appleman Professor of Biological Sciences at USC College.
The circuit tracing method allows the study of incoming and outgoing signals from any two brain centers. It was invented and refined by Thompson over eight years. Thompson is a research assistant professor of biological sciences at the College.
Most other tracing studies at present focus only on one signal, in one direction, at one location.
"[We] can look at up to four links in a circuit, in the same animal at the same time. That was our technical innovation," Swanson said.
The Internet model would explain the brain's ability to overcome much local damage, Swanson said.
"You can knock out almost any single part of the Internet and the rest of it works."
Likewise, Swanson said, "There are usually alternate pathways through the nervous system. It's very hard to say that any one part is absolutely essential."
Swanson first argued for the distributed model of the brain in his acclaimed book Brain Architecture: Understanding the Basic Plan (Oxford University Press, 2003).
The PNAS study appears to support his view.
"There is an alternate model. It's not proven, but let's rethink the traditional way of regarding how the brain works," he said.
"The part of the brain you think with, the cortex, is very important, but it's certainly not the only part of the nervous system that determines our behavior."
The research described in the PNAS study was supported by the National Institute of Neurological Disorders and Stroke in the National Institutes of Health.
Map of the World Wide Web
Connect your Brain to the Internet?
Mind at Light Speed - A New Kind of Intelligence
Brain Machine Interfaces
Artificial brain "10 years away"
"We'll be able to upload our brains to a computer"
Blue Brain - Year One (Video)
The Global Brain (Video)
Neuroimaging Of Brain Shows Who Spoke To A Person And What Was Said
Magnetic field found to stimulate brain cells
An Input/Output Device for the Brain - Made of Light, Algae, and Bacteria
Latest News from our Front Page
STAGED INFECTION: Has The Ebola ‘Outbreak’ Narrative Fallen Apart?
2014 10 22
Over the past month, the ‘pandemic’ propaganda surrounding the deadly Ebola virus seemed to reach vitriolic levels – raising serious questions about the validity of this current viral outbreak…
On Monday of this week, it was reported that 48 people were released and cleared after a 21-day quarantine due to their contact with the now deceased Ebola-stricken patient Thomas Eric ...
6,000-Year-Old Temple with Possible Sacrificial Altars Discovered
2014 10 21
A 6,000-year-old temple holding humanlike figurines and sacrificed animal remains has been discovered within a massive prehistoric settlement in Ukraine.
Built before writing was invented, the temple is about 60 by 20 meters (197 by 66 feet) in size. It was a "two-story building made of wood and clay surrounded by a galleried courtyard," the upper floor divided into five ...
What happened to Journalist Serena Shim? Assassinated? Find out what happened to Serena, Press TV director calls on Turkey
2014 10 21
Press TV news director Hamid Reza Emadi says the “suspicious death,” of the news channel’s correspondent in Turkey is a tragedy for “anyone who wants to get the truth.”
Emadi made the remarks in an interview with Press TV on Sunday following Serena Shim’s death across the border from Syria’s Kurdish city of Kobani, where the ISIL terrorists and Kurdish fighters ...
Ancient Roman Nanotechnology Inspires Next-Generation Holograms for Information Storage
2014 10 21
The Lycurgus Cup, as it is known due to its depiction of a scene involving King Lycurgus of Thrace, is a 1,600-year-old jade green Roman chalice that changes colour depending on the direction of the light upon it. It baffled scientists ever since the glass chalice was acquired by the British Museum in the 1950s, as they could not work ...
Rapid Geomagnetic Reversal Possibility: Confirmed
2014 10 21
From the video: "The scientists who conducted the study are still unsure why the magnetic field is weakening, but one likely reason is the Earth’s magnetic poles are getting ready to flip, said Rune Floberghagen, the ESA’s Swarm mission manager. In fact, the data suggest magnetic north is moving toward Siberia."
Tune into Red Ice Radio:
Ben Davidson - Suspicious0bservers: Space Weather ...
|More News » |