Navigation Links
Direct recording shows brain signal persists even in dreamless sleep
Date:9/30/2008

many years exploring the upper levels of the brain's functional architecture. In these studies, researchers typically ask volunteers to perform specific mental tasks as their brains are scanned using functional magnetic resonance imaging (fMRI). Such "goal-oriented" tasks might include looking for or studying a visual stimulus, moving an arm or leg, reading a word or listening for a sound. As the subjects perform these tasks, the scans reveal increases in blood flow to different parts of the brain, which researchers take as indications that the brain areas are contributing to the mental task.

In the past decade, though, scientists have realized that deeper structures underlie goal-oriented mental processes. These underlying brain processes continue to occur even when subjects aren't consciously using their brain to do anything, and the energies that the brain puts into them seem to be much greater than those used for goal-oriented tasks.

"The brain consumes a tremendous amount of the body's energy resourcesit's only 2 percent of body weight, but it uses about 20 percent of the energy we take in," says Raichle. "When we started to ask where all those resources were being spent, we found that the goal-oriented tasks we had studied previously only accounted for a tiny portion of that energy budget. The rest appears to go into activities and processes that maintain a state of readiness in the brain."

To explore this deeper level of the brain's functional architecture, Raichle and others have been using fMRI to conduct detailed analyses of brain activity in subjects asked to do nothing. However, a nagging question has dogged those and other fMRI studies: Scientists assumed that increased blood flow to a part of the brain indicates that part has contributed to a mental task, but they wanted more direct evidence linking increased blood flow to stepped-up activity in brain cells.

In the new study, He and her colleagues took fMRI scans o
'/>"/>

Contact: Michael C. Purdy
purdym@msnotes.wustl.edu
314-286-0122
Washington University School of Medicine
Source:Eurekalert

Page: 1 2 3

Related medicine news :

1. Direct Anesthetic Infusion Helps Colorectal Cancer Patients
2. AUDIO from Medialink and Commit Lozenge: Wanna Quit Smoking With Therapeutic Nicotine? Just Follow the Directions
3. National Association of Subrogation Professionals (NASP), the Largest Insurance Subrogation Association in the World - Announced Today that Leslie Wiernik has Joined the Organization as Director of Education
4. HealthInsuranceFinders.com Launches Video Contest for Young Directors
5. Arrow International Urges Shareholders To Vote for Approval of the $45.50 Teleflex Inc. Merger and for the Current Board of Directors
6. Coalition for Pulmonary Fibrosis Launches Aggressive Ad Campaign Directed at United States Congress
7. Zimmer Holdings Offer and ORTHOsoft Directors Circular Mailed to Shareholders
8. Glass Lewis Recommends Arrow Shareholders Vote on the White Proxy Card for Merger With Teleflex and for Current Board of Directors at Arrow Annual Meeting
9. STERIS Corporation Board of Directors Names Walter M. Rosebrough Jr. President and Chief Executive Officer
10. Fitness Champion Natalie Waples to be Spokesperson for Natural Nutrition International Direct Marketing Campaign
11. Nick Childs Joins Grey New York as Director of Content Development
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/2/2014)... become an increasing concern to health officials both in ... Department of Health and Mental Hygiene, the number of ... the number of such deaths in 2000. Much of ... in nonmedical prescription opioid (PO) use among teens and ... youth who transitioned from POs to heroin. , ...
(Date:9/2/2014)... Two Kansas State University biochemists have discovered a family ... Staphylococcus aureus , a pathogenic bacterium that can ... , Brian Geisbrecht, professor of biochemistry and molecular biophysics, ... S. aureus , which is the cause of increasing ... journal Proceedings of the National Academy of Sciences ...
(Date:9/2/2014)... that a mother,s eating habits prior to pregnancy, during ... her offspring and their propensity for developing weight problems, ... this phenomenon were unclear. According to new research published ... FASEB Journal F , scientists using an animal model ... an offspring,s risk of future obesity. This link hinges ...
(Date:9/2/2014)... Many people believe that marijuana is not addictive, but ... people are able to obtain and consume cannabis legally ... are less likely to perceive it as addictive or ... General Hospital,s Center for Addiction Medicine, said in a ... use can have significant consequences, and we know that ...
(Date:9/2/2014)... HMP Communications Holdings , LLC, a leader ... the acquisition of Nutrition411.com , a vibrant news ... who integrate diet and nutrition into patient consultations. , ... , Late-breaking news related to nutrition and disease ... oncology, renal disease, wound care, and pediatrics , ...
Breaking Medicine News(10 mins):Health News:NYC teens and young adults who abuse prescription at high risk for overdose 2Health News:NYC teens and young adults who abuse prescription at high risk for overdose 3Health News:Biochemists find new treatment options for staph infections, inflammatory diseases 2Health News:How genes link a mother's diet to the risk of obesity in her offspring 2Health News:'Pot Addiction' May Be Real, Study Suggests 2Health News:HMP Communications Holdings, LLC, Acquires Nutrition411.com 2
... converts to Masimo SET pulse oximetry and leverages ... ... capabilities, IRVINE, Calif., Feb. 13 Masimo, the inventor,of Pulse ... of UCSF Medical Center,s,system-wide implementation of Masimo SET pulse oximetry and ...
... SEATTLE, Feb. 13 An intriguing new offering ... Climb to Fight,Breast Cancer(R) benefiting Fred Hutchinson Cancer Research ... international slate of peaks to,include two expeditions to central ... (17,343 feet). Both trips will be led by,professional guides ...
... Underwriters, Inc. (Darwin) (NYSE: DR ) ... Specialty Product Network Insurance,Services, Inc. (ASPN)., ... the announced arrangement, ASPN,s nationwide team of ... intended to spread the,word about Darwin,s unique ...
... been able to eradicate the virus from infected individuals who ... HIV in hideouts known as viral reservoirs. One important reservoir ... due to the large number of HIV target cells that ... largely contained in lymph nodes and patches of lymphocytes that ...
... TOWN, W.V., Feb. 13 ReBuilder Medical,Technologies, ... of the art,electronic devices for diabetic peripheral ... up 89% over last year, details,are available ... ., (Logo: http://www.newscom.com/cgi-bin/prnh/20061128/REBUILDERLOGO ), ...
... results need to be replicated in larger study, experts ... drug originally designed to combat cancer that is now ... arthritis and lupus might also work against a common ... in the Feb. 14 issue of the New ...
Cached Medicine News:Health News:The University of California at San Francisco Medical Center Pioneers System-wide Adoption of Masimo Rainbow SET Technology 2Health News:The University of California at San Francisco Medical Center Pioneers System-wide Adoption of Masimo Rainbow SET Technology 3Health News:The University of California at San Francisco Medical Center Pioneers System-wide Adoption of Masimo Rainbow SET Technology 4Health News:The University of California at San Francisco Medical Center Pioneers System-wide Adoption of Masimo Rainbow SET Technology 5Health News:Climb to Fight Breast Cancer Offers Peaks for Every Skill Level 2Health News:Darwin Enters into Marketing Partnership with Agency Specialty Product Network 2Health News:HIV persists in the gut despite long-term HIV therapy 2Health News:ReBuilder Medical Technologies, Inc. Announces 2007 Sales Nearly Doubled Sales in 2006 2Health News:Cancer Drug Works Against MS in Early Trial 2Health News:Cancer Drug Works Against MS in Early Trial 3
(Date:9/2/2014)... 2, 2014  EMD Serono, Inc., a subsidiary of ... today that Drew Young has joined the ... this capacity, he will be responsible for leading the ... including future products.   Bringing more than 20 ... sales efforts at pharmaceutical and biotech companies, Mr. Young ...
(Date:9/2/2014)... 2014  Cyberonics, Inc. (NASDAQ: CYBX ... study.  Results of the study presented by a ... cardiology congress and concurrently published by the ... Therapy (ART) in patients with moderate to severe ... safe, improves the heart,s ability to pump blood, ...
(Date:9/2/2014)... , Sept. 2, 2014 ResMed (NYSE: ... 150 devices in the United States ... portable, lightweight, and user-friendly life support ventilators. ... mobility and ease of use for patients suffering from ... adult and childhood respiratory disorders. The U.S. launch comes ...
Breaking Medicine Technology:EMD Serono Appoints Drew Young to Senior Vice President, Neurology and Immunology 2EMD Serono Appoints Drew Young to Senior Vice President, Neurology and Immunology 3EMD Serono Appoints Drew Young to Senior Vice President, Neurology and Immunology 4ANTHEM-HF Shows Autonomic Regulation Therapy Is Safe And Improves Heart Function In Patients With Chronic Heart Failure 2ANTHEM-HF Shows Autonomic Regulation Therapy Is Safe And Improves Heart Function In Patients With Chronic Heart Failure 3ANTHEM-HF Shows Autonomic Regulation Therapy Is Safe And Improves Heart Function In Patients With Chronic Heart Failure 4ANTHEM-HF Shows Autonomic Regulation Therapy Is Safe And Improves Heart Function In Patients With Chronic Heart Failure 5ResMed's Revolutionary Life Support Ventilation Platform -- Astral 100 and 150 Devices Now Available in the U.S. 2ResMed's Revolutionary Life Support Ventilation Platform -- Astral 100 and 150 Devices Now Available in the U.S. 3
... Formation in ... Animals, Hearts, SUNRISE, ... of myoblasts modified to express,stromal derived factor-1(alpha) protein (SDF-1) into the ... were recently,presented at two scientific meetings -- the International Society for,Magnetic ...
... Enrollment Program Speeds Oncology Patient Accrual, ... Research Management,Organization (RMO), has contracted with five ... management services for their,clinical trials using the ... the following disease indications: follicular Non-Hodgkin,s,Lymphoma, Metastatic ...
Cached Medicine Technology:Bioheart Reports Promising Results From SDF-1 Modified MyoCell(R) Therapy in Heart Failure Study 2Bioheart Reports Promising Results From SDF-1 Modified MyoCell(R) Therapy in Heart Failure Study 3Bioheart Reports Promising Results From SDF-1 Modified MyoCell(R) Therapy in Heart Failure Study 4Bioheart Reports Promising Results From SDF-1 Modified MyoCell(R) Therapy in Heart Failure Study 5Bioheart Reports Promising Results From SDF-1 Modified MyoCell(R) Therapy in Heart Failure Study 6Pharmatech, Inc. Contracts for Five New Just-in-Time Clinical Trials 2
... DXC-990 camera is a 3 chip 1/2 inch color ... and a high s/n ratio. It offers picture contrast ... and knee control. The user can choose automatic exposure ... The Sony DXC-990 camera is a bayonet mount and ...
Sony DSR-20MD is the right choice If you need digital recording capability. It accepts both s-video and composite inputs....
... image management. Mediscan is an advanced ... derived from extensive experience with clinicians. ... organize, and distribute high quality images, ... effort. Can be connected to flexible ...
For continuous intracranial monitoring of pressure, oxygen and temperature of the brain...
Medicine Products: