Navigation Links
JPEG for the mind: How the brain compresses visual information
Date:2/10/2011

Most of us are familiar with the idea of image compression in computers. File extensions like ".jpg" or ".png" signify that millions of pixel values have been compressed into a more efficient format, reducing file size by a factor of 10 or more with little or no apparent change in image quality. The full set of original pixel values would occupy too much space in computer memory and take too long to transmit across networks.

The brain is faced with a similar problem. The images captured by light-sensitive cells in the retina are on the order of a megapixel. The brain does not have the transmission or memory capacity to deal with a lifetime of megapixel images. Instead, the brain must select out only the most vital information for understanding the visual world.

In today's online issue of Current Biology, a Johns Hopkins team led by neuroscientists Ed Connor and Kechen Zhang describes what appears to be the next step in understanding how the brain compresses visual information down to the essentials.

They found that cells in area "V4," a midlevel stage in the primate brain's object vision pathway, are highly selective for image regions containing acute curvature. Experiments by doctoral student Eric Carlson showed that V4 cells are very responsive to sharply curved or angled edges, and much less responsive to flat edges or shallow curves.

To understand how selectivity for acute curvature might help with compression of visual information, co-author Russell Rasquinha (now at University of Toronto) created a computer model of hundreds of V4-like cells, training them on thousands of natural object images. After training, each image evoked responses from a large proportion of the virtual V4 cells -- the opposite of a compressed format. And, somewhat surprisingly, these virtual V4 cells responded mostly to flat edges and shallow curvatures, just the opposite of what was observed for real V4 cells.

The results w
'/>"/>

Contact: Lisa DeNike
Lde@jhu.edu
443-287-9960
Johns Hopkins University
Source:Eurekalert  

Page: 1 2

Related medicine news :

1. What makes fructose fattening? OHSU researchers find some answers in the brain
2. Gestures May Help the Brain See
3. Study Links Brain Molecule to Risk of Major Depression
4. Major step taken toward an open and shared digital brain atlasing framework
5. Schizophrenia Drugs May Spur Subtle Brain Tissue Loss
6. Allergies Linked to Lower Brain Cancer Rate in Study
7. Brains need love, too
8. Electrical Stimulation of the Brain May Spark Insight
9. Targeted particle fools brains guardian to reach tumors
10. Brain scans predict likely success when it comes to quitting smoking
11. Brain pacemakers: A long-lasting solution in the fight against depression
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
JPEG for the mind:  How the brain compresses visual information
(Date:12/21/2014)... December 21, 2014 AlignLife of Norton ... need while at the same time helping people get their ... non-profit community-based organization committed to serving those persons in Muskegon ... needs to improve the quality of life. Dr. Michael Rykse ... impact in the local community and he knew he found ...
(Date:12/21/2014)... December 21, 2014 Serious Buyer, Andrew ... 1967 Jm Morrison and the Doors International Ballroom at ... would also be the only time that Morrison's mother ... on Nov. 25, 1967. According to Hawley, “This would ... did play the Alexandria Roller Rink earlier that year ...
(Date:12/21/2014)... Parker & Sons, Inc. a market leader ... other similar home contractor services announces a record number ... expert contracting services. The company is considered by many ... Arizona for well over 40 years. Parker and Sons ... quality customer service to the residents and business owners ...
(Date:12/21/2014)... Over the past 39 years, NES ... of emergency departments across the nation, from quality of ... translated into an innovative suite of tools, systems, and ... enhance the patient experience. , NES Health, a ... management services for hospitals, announced the development and launch ...
(Date:12/21/2014)... (PRWEB) December 21, 2014 SCI ... of the issues and systemic barriers for disabled athletes ... Paratriathlon Champion. Scheidies has a condition called juvenile macular ... He describes how he adapted his athletic ambitions to ... his success in triathlon to pioneer the way for ...
Breaking Medicine News(10 mins):Health News:AlignLife of Norton Shores Makes a Brighter Christmas for Kids in Muskegon 2Health News:Parker & Sons Announces Record Number Of Favorable Reviews In 2014 With Regard To Its Expert Contracting Services 2Health News:Parker & Sons Announces Record Number Of Favorable Reviews In 2014 With Regard To Its Expert Contracting Services 3Health News:NES Health Launches Stipend Program for Emergency Physicians in Training to Financially Assist Emergency Department Doctors While They Learn 2Health News:Disability in Sports on SCI TV with Triathlon World Champ Aaron Scheidies 2Health News:Disability in Sports on SCI TV with Triathlon World Champ Aaron Scheidies 3
... researchers have found that a radical prostatectomy can be ... which run counter the// conventional practice of generally avoiding ... on age, are available today in Urology. ... as well as safer forms of anesthesia and less-invasive ...
... Medical Association (AMA) has said that the scheme proposed to ... ,In July, a scheme was made public by the Council ... by December; this was thought to be need of the ... foreign doctor and the death of 17 patients., ...
... it initially helps in inducing slumber, says a new study.// ... of the night and overall less deep sleep, reported the ... Conroy and other researchers at the University of Michigan examined ... drinking habits and its impact on their sleep. ...
... psychologists have observed an alarming trend in the kids, even those ... like teenagers. The physical and// behavioral changes which marks the teenage ... age of 8 to 12; so the sobriquet ‘tweens’, seems to ... a fancy to own expensive items like cell phones and iPods. ...
... NASA aims to help people control their brain waves. ... ameliorating a wide range of// ailments. NASA developed this training ... later this technique was introduced in Korea in 2003. ... Medical Center adopted this technique, but now it is being ...
... a new study about alcoholism and published the results ... Research.// The study highlighted 3 main points: ... leads to poor-quality sleep later in the night. ... lead to alcoholism. ,· Inaccurate sleep perceptions among ...
Cached Medicine News:Health News:Octogenarians Are Not Too Old for Cancer Surgery 2Health News:Tune Your Brain To Fight Disorders 2Health News:Alcohol Dependence For Sleep Perceptions May Result In Alcoholism 2Health News:Alcohol Dependence For Sleep Perceptions May Result In Alcoholism 3
(Date:12/19/2014)... Dec. 18, 2014 Capnia, Inc. (NASDAQ: ... of medical diagnostics based on its proprietary Sensalyze™ ... today announced financial results for the third quarter ... "Following the completion of our initial public ... maximize the recently initiated CoSense® commercial launch," said ...
(Date:12/19/2014)... -- Since last month,s FBI shutdown of online drug ... leading online black market for illegal drugs - Evolution ... of drugs and other illegal items.  New numbers from ... in lowering the numbers of drugs and illegal items ... August. But some new sites that have emerged as ...
(Date:12/19/2014)... separating membrane market has witnessed robust development with the ... as a later starter. In 2012, the size of ... billion, with the proportion worldwide soaring to 16.3%. It is ... will continue its growth rate by around 20% in the ... to roughly RMB25 billion. An integrated membrane industrial ...
Breaking Medicine Technology:Capnia Reports Third Quarter 2014 Financial Results 2Capnia Reports Third Quarter 2014 Financial Results 3Capnia Reports Third Quarter 2014 Financial Results 4Capnia Reports Third Quarter 2014 Financial Results 5Capnia Reports Third Quarter 2014 Financial Results 6Capnia Reports Third Quarter 2014 Financial Results 7Capnia Reports Third Quarter 2014 Financial Results 8Post Silk Road - Another Online Drug Den Now Dominates the DarkNet 2Post Silk Road - Another Online Drug Den Now Dominates the DarkNet 3Separation Membranes Market (Company, Country & Application) Research Reports for Global and Chinese Regions 2Separation Membranes Market (Company, Country & Application) Research Reports for Global and Chinese Regions 3
... American Medical Systems® (AMS) (Nasdaq: ... and therapies for male and female pelvic health, today ... Program (STEP) in Europe. The program is designed to ... about solutions for the treatment of erectile dysfunction (ED) ...
... CHICAGO, Jan. 14, 2011   The Cleveland Clinic and ... support the Clinic,s effort to become a clinically integrated ... together the Cleveland Clinic Hospitals, physicians, and more than ... Cleveland Clinic, through its Community Physician Partnership (CPP), recognized ...
Cached Medicine Technology:American Medical Systems Launches STEP Patient Education Program in Europe 2American Medical Systems Launches STEP Patient Education Program in Europe 3Valence Health Selected by Cleveland Clinic to Support Clinical Integration Program 2
New!...
...
Mendez Multi-Purpose LASIK Forceps. To enter, dissect, elevate and smooth the flap. Combined features of Spatula, Dissector and Forceps, Titanium...
The CGPL capsulotomy contact glass was designed by Riquin, Fankhauser et al. for the dissection of opacified posterior lens capsules and membranes in the pupillary and retropupillary space with the Y...
Medicine Products: