Navigation Links
Brain scans show why we always have room for dessert

"Instead of using a bell and meat powder, which is what Pavlov originally used, researchers used visual pictures of little intrinsic significance and coupled those to food smells," said Dr. Jay Gottfried of Imaging Neuroscience at University //College London.

Gottfried was trying to explain what he calls the "restaurant phenomenon."

You sit down to your eight-course meal for your birthday and you have gone though all the appetizers and entrees and just as you feel you can't fit one more thing in your tummy, then they bring the dessert menu or the dessert cart rolls by and suddenly you discover you have room for the chocolate fondant. This is specific satiation -- you are full of one thing but not another.

The phenomenon may help explain why diets fail, but it also sheds light on how the brain works. Gottfried, said he wanted to find out how the brain learns and wanted to look for brain regions that showed decreased activity going from pre- to post-feeding .

Live brain scans The 13 volunteers underwent functional magnetic resonance imaging -- a way of looking at brain activity "live" -- while doing what they thought were simple computer tasks. Gottfried and colleagues showed them abstract, computer-generated images while at the same time wafting their way the odors of either vanilla ice cream or peanut butter.

"At various points before, during and after scanning we asked them to give us pleasantness ratings for the smells," Gottfried said. Unconsciously, the volunteers began to associate the images with the smells. Then they fed them either peanut butter or ice cream.

They imaged the brains again and found strong emotional responses to the smells got weaker after the volunteers ate the corresponding food.

A person's response to the peanut butter odor changed after eating some peanut butter, but a vanilla smell made the brain light up again. Eventually, the abstract picture associated with vanil la evoked the responses, but again they weakened after the volunteers ate. Gottfried said specific brain circuits are involved in this process. The researchers found heavy involvement of the amygdala -- the area of the brain best known for processing emotions -- and the orbitofrontal cortex.

Something must tell the brain when to respond and when not to, and this does not necessarily stop at food. Whether we are talking about food or sex or even things on the aversive scale such as dangers and threats and predators, the brain also needs to know how to update ... and modulate these associations so you don't get stuck in a rut.

Related medicine news :

1. Use of Cellular Phones associated with Increased risk of Brain Tumors
2. Brain death – How to cope with it
3. “Brain fingerprinting”- The new lie detectr
4. Nasal Spray Could Take Drugs Direct to Brain.
5. Virus Combats Brain Tumour
6. Nasal Spray Could Take Drugs Directly to Brain
7. Control of anger disorder connected to Brain Dysfunction
8. High Levels of Protein Linked to Brain Shrinkage
9. Brain damage affects artistic skill
10. Brain cells protected by new compounds
11. Brain changes observed in people with sleep apnoea
Post Your Comments:

(Date:11/30/2015)... ... 2015 , ... The recently published 32nd Annual Report of ... that in 2014, someone called a poison center about every 11 seconds. America’s ... human exposure cases. , The American Association of Poison Control Centers (AAPCC) maintains ...
(Date:11/30/2015)... ... November 30, 2015 , ... The Foundation for Breast ... and prevention—is joining forces with the award-winning creator and writer of Downton Abbey ... 7, 2015 at the Union League of Philadelphia. , The benefit, titled ...
(Date:11/30/2015)... , ... November 30, 2015 , ... ... magazine, quoted Michael Hansen, Ph.D., a senior scientist at Consumer Reports as supporting ... so for a child’s exposure limits. , The original Nov 2015 CR story ...
(Date:11/30/2015)... ... November 30, 2015 , ... An inventor from Charlottesville, Va., is concerned about ... baby had high blood pressure due to loud noises," she said, "so I decided ... noise pollution as well as radio waves and microwaves." , The baby BABY MUFF ...
(Date:11/30/2015)... CHICAGO (PRWEB) , ... November ... ... introduced two new additions to its industry-leading suite of automated breast density ... of North America (RSNA) meeting, November 29-December 4, 2015 (South Hall booth ...
Breaking Medicine News(10 mins):
(Date:11/30/2015)... VIEW, Calif. , Nov. 30, 2015 ... been the norm in U.S. medical imaging ... The increasingly popular accountable care payer-provider contracts ... models and, in their wake, alter provider-vendor ... quality-based payments will push forward new purchasing ...
(Date:11/30/2015)... and SAN DIEGO , ... Pharmaceuticals, Inc. (NASDAQ: ARNA ) today announced that ... for filing the New Drug Application (NDA) for an ... release formulation will offer patients a chronic weight management ... ® ) is currently approved as an adjunct to ...
(Date:11/30/2015)... and ST. LOUIS , Nov. 30, ... ESRX ) today announced an early renewal of ... began in 1999, will now extend through at least ... After evaluating pharmacy benefit manager capabilities during a ... Scripts continues to offer the best health plan integration ...
Breaking Medicine Technology: