Navigation Links
How the brain loses and regains consciousness
Date:3/4/2013

n that emerged during anesthesia.

In the new study, the researchers studied healthy volunteers, measuring their brain activity with an array of 64 electrodes attached to the scalp. Not only did they find patterns that appeared to correspond to what they saw in last year's study, they were also able to discern much more detail, because they gave the dose of propofol over a longer period of time and followed subjects until they came out of anesthesia.

While the subjects received propofol, the researchers monitored their responsiveness to sounds. Every four seconds, the subjects heard either a mechanical tone or a word, such as their name. The researchers measured EEG activity throughout the process, as the subjects pressed a button to indicate whether they heard the sound.

As the subjects became less responsive, distinct brain patterns appeared. Early on, when the subjects were just beginning to lose consciousness, the researchers detected an oscillation of brain activity in the low frequency (0.1 to 1 hertz) and alpha frequency (8 to 12 hertz) bands, in the frontal cortex. They also found a specific relationship between the oscillations in those two frequency bands: Alpha oscillations peaked as the low-frequency waves were at their lowest point.

When the brain reached a slightly deeper level of anesthesia, a marked transition occurred: The alpha oscillations flipped so their highest points occurred when the low frequency waves were also peaking.

The researchers believe that these alpha and low-frequency oscillations, which they also detected in last year's study, produce unconsciousness by disrupting normal communication between different brain regions. The oscillations appear to constrain the amount of information that can pass between the frontal cortex and the thalamus, which normally communicate with each other across a very broad frequency band to relay sensory information and control attention.

The oscillati
'/>"/>

Contact: Sarah McDonnell
s_mcd@mit.edu
617-827-7637
Massachusetts Institute of Technology
Source:Eurekalert

Page: 1 2 3 4

Related medicine news :

1. Very low risk of infections in advanced brain procedures
2. New chemical probe provides tool to investigate role of malignant brain tumor domains
3. Study identifies growth factor essential to the most common malignant pediatric brain tumor
4. Research: Brain cant cope with making a left-hand turn and talking on hands-free cell phone
5. UGA researchers identify brain pathway triggering impulsive eating
6. Brain-to-brain interface allows transmission of tactile and motor information between rats
7. Traumatic Brain Injury (TBI) Legal Resource For People Seeking Legal Options Unveiled at LawsuitLegal.com
8. Einstein receives $3 million to study impact of soccer heading on the brain
9. Network analysis of the brain may explain features of autism
10. Brain Connections Differ in Children With Autism
11. Scientists Pinpoint How Deep Brain Stimulation Eases OCD
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/21/2014)... OH (PRWEB) December 21, 2014 As ... men alleging heart attacks, stroke and blood clots from ... to increase, a new study shows that the male ... colon cancer. In a study published in the Proceedings ... researcher, James Amos-Landgraf examined a group of male rats ...
(Date:12/21/2014)... 21, 2014 Concept Plus, LLC. a ... headquartered in Fairfax, VA., today announced it has been ... 50 list, which ranks the fastest growing government contracting small ... to 2013. , This is the first year that Concept ... # 20 with a 95.92% compound annual growth rate. “For ...
(Date:12/20/2014)... December 21, 2014 MissyDress, a distinguished ... all prom lovers. The business has drastically cut prices ... dresses to everyone until Jan. 30, 2015. Many of ... sweetheart dresses, V-neck dresses, lace dresses, and more. , ... not there every day. Whether A-line princess prom dresses ...
(Date:12/20/2014)... Dress company LunaDress has recently announced its 2015 collection ... big discounts on all of its special occasion dresses & ... a perfect wedding gown. If you have no idea of ... LunaDress. Many different wedding dress styles and our dress experts ... enjoy the current special offer, up to 80% off," the ...
(Date:12/20/2014)... -- The holidays can be anything but joyous for ... scented candles and other allergy triggers. "The dust ... been packed away in dank basements or dusty attics ... Dr. Rachna Shah, an affiliate faculty member at Loyola ... news release. Shah, who is also an allergist ...
Breaking Medicine News(10 mins):Health News:New Low Testosterone Therapy Study Shows Male Hormone Testosterone May Contribute To Colon Cancer Reports Wright & Schulte LLC 2Health News:New Low Testosterone Therapy Study Shows Male Hormone Testosterone May Contribute To Colon Cancer Reports Wright & Schulte LLC 3Health News:New Low Testosterone Therapy Study Shows Male Hormone Testosterone May Contribute To Colon Cancer Reports Wright & Schulte LLC 4Health News:Concept Plus, LLC. Named One of Washington Technology’s Fast 50 2Health News:MissyDress: The Prices of Prom Dresses Just Reduced 2Health News:2015 Collection of Wedding Dresses from LunaDress Online on Sale Now 2Health News:Holiday Trimmings Can Trigger Allergies 2
... , LOS ANGELES, Dec. 21 Garcia Research ... US Hispanic marketing community, launched LATINOMICS(SM), The Hispanic Market Index(TM), ... political perspectives and other issues of the day within the ... survey of roughly 600 interviews was conducted, 400 by phone ...
... Mimotopes PepSets ... and Mycobacterium tuberculosis that can be targeted by new vaccines , ... Melbourne, Australia (PRWEB) December 21, 2009 -- Mimotopes Pty ... that it has been awarded a major supply agreement for the synthesis of peptide libraries ...
... ... YORK, Dec. 21 Jamie Oliver, celebrity chef and standard-bearer in the fight ... of the 2010 TED Prize, an award granting recipients $100,000 and something much ... , The host of 12 television series seen in 130 countries and bestselling ...
... , NASDAQ: CRME TSX: COM ... CRME / TSX: COM) today announced that it ... and employees (each a "restricted person") to adopt automatic securities ... Canadian and U.S. securities laws, including the guidance under Ontario ...
... , , FORT WORTH, Texas, ... Medicine (TCOM) offered a health screening for the homeless Friday, Dec. ... County. , Each Friday, 10 to 20 TCOM students from UNT ... Fort Worth,s Day Resource Center -- one of the main ...
... from Boston University School of Medicine (BUSM) have discovered a ... The study, which appears on-line in the Journal of ... in lung tissue for a lifetime after only a single ... inherited form of emphysema seen in young people due to ...
Cached Medicine News:Health News:Latinos Overwhelmingly Support Health Care Reform 2Health News:Mimotopes Awarded a Major Peptide Library Supply Agreement by La Jolla Institute for their Studies Screening Dengue and Tuberculosis Pathogens 2Health News:Mimotopes Awarded a Major Peptide Library Supply Agreement by La Jolla Institute for their Studies Screening Dengue and Tuberculosis Pathogens 3Health News:Mimotopes Awarded a Major Peptide Library Supply Agreement by La Jolla Institute for their Studies Screening Dengue and Tuberculosis Pathogens 4Health News:Jamie Oliver, Chef and International Nutrition Advocate, Named Recipient of 2010 TED Prize 2Health News:Jamie Oliver, Chef and International Nutrition Advocate, Named Recipient of 2010 TED Prize 3Health News:Jamie Oliver, Chef and International Nutrition Advocate, Named Recipient of 2010 TED Prize 4Health News:Jamie Oliver, Chef and International Nutrition Advocate, Named Recipient of 2010 TED Prize 5Health News:Jamie Oliver, Chef and International Nutrition Advocate, Named Recipient of 2010 TED Prize 6Health News:Cardiome Pharma Corp. Permitting Automatic Securities Disposition and Purchase Plans 2Health News:Cardiome Pharma Corp. Permitting Automatic Securities Disposition and Purchase Plans 3Health News:Cardiome Pharma Corp. Permitting Automatic Securities Disposition and Purchase Plans 4Health News:Cardiome Pharma Corp. Permitting Automatic Securities Disposition and Purchase Plans 5Health News:Cardiome Pharma Corp. Permitting Automatic Securities Disposition and Purchase Plans 6Health News:TCOM Students Care for Homeless at Day Resource Center 2Health News:Researchers discover gene therapy to prevent progression of emphysema 2
(Date:12/17/2014)...  Northstar Global Business Services, Inc. (OTCPink:MDIN) today ... made their final decision and has determined to ... effective December 15, 2014, and has resumed accepting ... book entry transfer services. All deposit restrictions have been ... fully "DTC Eligible", and has resumed electronic trading ...
(Date:12/17/2014)... 2014  Beamz Interactive, Inc. (OTCQB: BZIC), a ... announced that it has signed an agreement with ... of innovative prosthetic, orthotic and assistive technology products ... agreement, RSL Steeper will promote and supply the ... use within UK residential care facilities through its ...
(Date:12/17/2014)... 17, 2014  ImmunoCellular Therapeutics, Ltd. ("ImmunoCellular") (NYSE ... Trademark Office (USPTO) has issued a key patent ... immunotherapeutic vaccine targeting six tumor antigens that are ... Patent No. 8,871,211, which issued October 28, 2014, ... a dendritic cell composition comprising peptide epitopes of ...
Breaking Medicine Technology:Northstar announces that the DTC chill on MDIN has been officially lifted 2Northstar announces that the DTC chill on MDIN has been officially lifted 3Beamz Interactive, Inc. Signs UK Distribution Agreement with RSL Steeper Limited 2Beamz Interactive, Inc. Signs UK Distribution Agreement with RSL Steeper Limited 3ImmunoCellular Therapeutics Announces Issuance of Key Patent For ICT-107 Cancer Vaccine 2
... Consulting, a business unit of PAREXEL International (Nasdaq: ... serving the biopharmaceutical and medical device industries, today released ... provide key insights into emerging areas of biosimilar development. ... Consultant and Cecil Nick, B.Sc. (Hons), Vice President, Biotechnology, ...
... of Primary Astrocytes With Anti-GLAST MicroBeads -- BERGISCH GLADBACH, Germany, September 22, 2010 ... ... --> ... s = ,; var first_result; // Results are keyed by longUrl, so we need to grab the ...
Cached Medicine Technology:PAREXEL Consulting Thought Leaders Provide Insights Into U.S. Biosimilar Development and Monoclonal Biosimilars in Two New White Papers 2PAREXEL Consulting Thought Leaders Provide Insights Into U.S. Biosimilar Development and Monoclonal Biosimilars in Two New White Papers 3PAREXEL Consulting Thought Leaders Provide Insights Into U.S. Biosimilar Development and Monoclonal Biosimilars in Two New White Papers 4PAREXEL Consulting Thought Leaders Provide Insights Into U.S. Biosimilar Development and Monoclonal Biosimilars in Two New White Papers 5Direct Isolation of Primary Astrocytes With Anti-GLAST MicroBeads 2Direct Isolation of Primary Astrocytes With Anti-GLAST MicroBeads 3Direct Isolation of Primary Astrocytes With Anti-GLAST MicroBeads 4Direct Isolation of Primary Astrocytes With Anti-GLAST MicroBeads 5Direct Isolation of Primary Astrocytes With Anti-GLAST MicroBeads 6
The ISI Digi Grip has the strength needed for secure ,upper extremity traction....
The ApexPro CH is operational within the WMTS. It offers operating performance, up to 240 WMTS channels, and up to 120 hours of battery life....
... portable TeleMon companion monitor, and IntelliVue ... and monitoring solution for ambulating patients ... and SpO2. Clinicians can get access ... from the central station, monitoring cockpit, ...
ISI DuraHand is the reusable, easy to sterilize surgical hand immobilizer....
Medicine Products: