Navigation Links
Deep sleep short-circuits brain's grid of connectivity

In the human brain, cells talk to one another through the routine exchange of electrical signals. But when people fall into a deep sleep, the higher regions of the brain - regions that during waking hours are a bustling grid of neural dialogue - apparently lose their ability to communicate effectively, causing consciousness to fade.

Writing today (Sept. 30) in the journal Science, a team of researchers led by University of Wisconsin-Madison professor of psychiatry Giulio Tononi reports that the fading of consciousness during dreamless sleep seems to occur as the different regions of the cerebral cortex that mediate perception, thought and action become functionally disconnected.

Tononi and his team observed the disconnect when brief, magnetically generated pulses of electricity were directed to specific regions of the brain. The pulses stimulated an electrochemical response from the targeted cells, which, when the subject was awake, rippled across the brain, traveling along networks of nerve fibers to different cerebral destinations. But when the subject was in deep sleep, the same response was quickly extinguished and did not travel beyond the stimulated cells.

When consciousness fades, according to Tononi, "the brain breaks down into little islands that can't talk to one another."

The new findings are important because they provide the first direct clues about how the brain alters the state of consciousness during sleep. Consciousness is a scientifically murky realm as little research has been conducted on how the brain sustains and alters the various states of mind. Tononi, one of the few scientists exploring the frontiers of consciousness, has theorized that conscious thought depends on the brain's ability to integrate information.

"Sleep is the most familiar alteration of consciousness," he says. "It happens every night to all of us. Every night, when you fall into deep sleep, your consciousness usually fades."

Ind
'"/>

Source:University of Wisconsin-Madison


Page: 1 2 3

Related biology news :

1. Wisconsin researchers identify sleep gene
2. Brain-mapping technique aids understanding of sleep, wakefulness
3. Newly discovered protein an important tool for sleeping sickness research
4. Compound might defeat African sleeping sickness, clinical trial beginning this month
5. Flies on speed offer insight into the roles of dopamine in sleep and arousal
6. Asleep in the deep: Model helps assess ocean-injection strategy for combating greenhouse effect
7. Waking a sleeping virus
8. Morning grogginess more debilitating than sleep deprivation, according to CU-Boulder study
9. Losing sleep undoes the rejuvenating effects new learning has on the brain
10. A large step forward in the fight against African sleeping sickness
11. Serotonin, acting in a specific brain region, promotes sleep in fruit flies
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Deep sleep short circuits brain grid connectivity

(Date:7/23/2014)... around the world by 2050, according to one of ... Change (IPCC), may be advantageous to the physiology and ... of forage plants such as Stylosanthes capitata Vogel ... countries such as Brazil., The conclusion is from a ... Biology at the Ribeiro Preto Faculty of Philosophy, Sciences ...
(Date:7/23/2014)... MA -- What do mollusks, starfish, and corals ... habitat, they are all calcifiersorganisms that use calcium ... and shells for stability and protection. , The ... published by the Marine Biological Laboratory, addresses the ... changes worldwide. , As atmospheric carbon dioxide rises, ...
(Date:7/23/2014)... 23, 2014   MedNet Solutions , a ... study management systems, is pleased to announce that ... sciences industry executive with over 25 years of ... Clareece will be responsible for MedNet,s day-to-day operating ... and quality product/service delivery.  "We ...
Breaking Biology News(10 mins):An increase in temperature by 2050 may be advantageous to the growth of forage plants 2An increase in temperature by 2050 may be advantageous to the growth of forage plants 3An increase in temperature by 2050 may be advantageous to the growth of forage plants 4Calcification in changing oceans explored in special issue of The Biological Bulletin 2MedNet Appoints Clareece West As Chief Operating Officer 2
... and New South Wales have put aside their competitive ... project, as announced by Innovation Minister Gavin Jennings and ... today. Scientists from the Monash Institute of ... will compare two different methods of creating patient-specific stem ...
... the recipients of the 2007 National Medal of Science, ... will receive the medals at a White House ceremony ... of Science laureates have contributed to American science with ... of the National Science Foundation (NSF). "Their legacies have ...
... Dogs suffering from lymphoma will be able to receive ... counterparts, as North Carolina State University becomes the first ... transplants in a clinical setting. Dr. Steven Suter, ... Veterinary Medicine, received three leukophoresis machines donated by the ...
Cached Biology News:Stem cell research puts interstate rivalry on hold 2White House announces 2007 National Medal of Science laureates 2NC State first university in nation to offer canine bone marrow transplants 2
(Date:7/22/2014)... Piscataway, NJ (PR Web) July 21, 2014 (PRWEB) ... Jersey Center for Biomaterials, at Rutgers University. ... exchange information and ideas across the full spectrum ... focusing on selected research and development topics that ... application. Activities have been programmed to:, ...
(Date:7/22/2014)... the National Institute of Standards and Technology (NIST) ... a new design for an atomic clock that ... a microcomb. , The microcomb clock, featured on ... new journal Optica ,* is the first ... its accurate conversion of optical frequencies to lower ...
(Date:7/22/2014)... DALLAS , July 22, 2014   ... replacement therapy using natural, bio-identical hormone pellets, today ... , MD to the company.   Dr. Rouzier is ... training physician.      Dr. Rouzier was ... at UCLA and is a board certified emergency ...
(Date:7/22/2014)... Automated cell culture systems are instruments that ... They allow production of optimum cells at a large ... discovery and industries and biopharmaceutical companies. Cell culture automation ... cryobanking, cell-based assays, and cellular expression systems as they ... the Global Cell Culture market will grow ...
Breaking Biology Technology:The 2014 NJ Symposium on Biomaterials Science Earns Society for Biomaterials Endorsement 2'Comb on a chip' powers new NIST/Caltech atomic clock design 2Dr. Neal Rouzier Joins BioTE Medical 2Dr. Neal Rouzier Joins BioTE Medical 3Global Cell Culture Market to Grow at 10.27% CAGR by 2018 Forecasts a New Research Report ReportsnReports.com 2Global Cell Culture Market to Grow at 10.27% CAGR by 2018 Forecasts a New Research Report ReportsnReports.com 3Global Cell Culture Market to Grow at 10.27% CAGR by 2018 Forecasts a New Research Report ReportsnReports.com 4
... Amylin Pharmaceuticals,Inc. (Nasdaq: AMLN ) will be ... Point on Wednesday, June 11, 2008 at 1:20,p.m. PT. ... Pharmaceuticals, will be providing a corporate overview., The ... will be made,available following the event. The Web cast ...
... 5 Telik, Inc.,(Nasdaq: TELK ) announced that ... Annual Needham & Company Biotechnology and Medical,Technology Conference in ... 10:00,a.m. Eastern time (7:00 a.m. Pacific time). A live ... the Telik website, http://www.telik.com ., Telik, Inc. of ...
... Boston Scientific,Corporation (NYSE: BSX ) is scheduled ... being held June 9-12 in Dana Point,CA., Jim ... presentation which will be followed by a 25-minute question ... 8:00 a.m.,PT., A live webcast of Mr. Tobin,s ...
Cached Biology Technology:
... pump is a dedicated cuff pump for small ... replaces manual inflation and can be used for ... mouse and rat; from single up to multi-channel ... pump has adjustable cut-off pressure in 50 mmHg ...
... space and organize gloves, safety glasses, ... are the perfect benchtop storage bins ... processing and manufacturing. Clear static-dissipative PVC ... they attract. Open-slot design for easy ...
... These handy dispensers save space ... hats, and other garb. They are ... small parts used in labs, processing ... static charges and the particles they ...
... Measurement of light production by luciferase-cDNA transfected ... valuable technique in the development of reporter ... used as an indicator for the transcription ... luciferase enzyme is due to advantages such ...
Biology Products: