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:1/22/2015)... over 20 years, Dr. David Cruz of Cruz Chiropractic Care ... just about every type of injury that can result from car ... twenty-plus years, the team at Doctors on Liens has ... doctor. With the combined breadth of experience between the ...
(Date:1/22/2015)... La Jolla, Calif. (PRWEB) January 22, 2015 ... and Assemblymembers Susan Bonilla (D-Concord) and Kristin Olsen ... (CHI) for their leadership in advancing biotechnology, biomedical ... Mitchell, Bonilla and Olsen each received the “2014 ...
(Date:1/22/2015)... Payday lending practices in four southern states ... distress to the states that permit them, according to ... on Race and Wealth. , While they generate hundreds ... at the same time substantially depress economic activity, according ...
(Date:1/22/2015)... 22, 2015 Compare-autoinsurance.org has released a new blog ... an auto insurance policy . , Some types of ... should check the newly released blog post to see if their ... dangerously damaged vehicles are some of the cars that cannot be ...
(Date:12/26/2014)... December 26, 2014 The US represents the ... report. In 2013, GlobalData’s forecast estimates that sales of branded ... market due to the high incidence of the disease, high ... 5EU, Japan, and China. Increased sales of CRC therapies over ...
Breaking Medicine News(10 mins):Health News:Industry Leading Chiropractor in Oceanside Joins the Doctors on Liens Network 2Health News:California Biomedical Community Honors Senator Holly Mitchell, Assemblymembers Susan Bonilla & Kristin Olsen 2Health News:California Biomedical Community Honors Senator Holly Mitchell, Assemblymembers Susan Bonilla & Kristin Olsen 3Health News:Howard University Spotlights the Economic Impact of Payday Lending in Southern States 2Health News:Some Vehicles Cannot Be Covered By An Auto Insurance Policy! 2Health News:US Colorectal Cancer Drug Market Analysis and Forecast to 2023 Report Available at ReportsnReports.com 2Health News:US Colorectal Cancer Drug Market Analysis and Forecast to 2023 Report Available at ReportsnReports.com 3Health News:US Colorectal Cancer Drug Market Analysis and Forecast to 2023 Report Available at ReportsnReports.com 4
... shorter life for men, study finds , , FRIDAY, March 14 ... live longer, but may harm older men, U.S. research ... Case Western Reserve University followed 1,000 seniors in three Florida ... that women with higher levels of anxiety at the start ...
... with Elected Officials, WASHINGTON, March 14 Nyle ... April 1 to meet with,congressional leaders and gain their ... for epilepsy public health,programs and more research toward a ... young people with epilepsy participating in Kids,Speak Up!, a ...
... Visit Washington, D.C., and Meet With Elected Officials, ... travel to Washington, D.C., this April 1 to meet ... the,Americans with Disabilities Act, support for epilepsy public health,programs ... Soeby, 10, is one of 50 young people with ...
... to Visit Washington, D.C., and,Meet with Elected Officials, ... and Nicklaus Schliesmann of Holmen will travel to ... leaders and gain their,support for restoration of the ... programs and more research toward a cure for,epilepsy., ...
... Visit Washington, D.C., and Meet with,Elected Officials, WASHINGTON, ... of San Antonio will travel to Washington, D.C.,this April ... support for,restoration of the Americans with Disabilities Act, support ... cure for epilepsy., Eubank and Fitzhugh, both 14, ...
... Inc. (Nasdaq: BDMS ), operators of PERFECT ... Company,s board of directors,has declared a quarterly cash ... The dividend is payable April 11, 2008, to ... Management Services, Inc. acquires, develops, and manages,geographically dense ...
Cached Medicine News:Health News:Anxiety Helps Elderly Women Live Longer 2Health News:Florida Youth Named National Epilepsy Spokesperson 2Health News:Arizona Youth Named National Epilepsy Spokesperson 2Health News:Wisconsin Youths Named National Epilepsy Spokespersons 2Health News:Texas Youths Named National Epilepsy Spokespersons 2
(Date:1/23/2015)... Jan. 23, 2015  Mallinckrodt plc (NYSE: MNK ... approved a share repurchase program. The open-ended authorization permits ... Mallinckrodt plc ordinary shares. "Funding additional ... priorities as we continue to pursue a range of ...
(Date:1/23/2015)... CHENGDU, China , Jan. 23, 2015 Tianyin ... pharmaceutical company that specializes in the development and sale ... branded generics and active pharmaceutical ingredients (API) today announced ... Facility (JCM) API operation. 1. Following the ...
(Date:1/22/2015)... UPI ), a medical device company that develops, ... dysfunctions, today reported financial results for the fiscal 2015 ... for the Company,s Urgent ®  PC Neuromodulation System grew ... as compared to $3.9 million in the third quarter ...
Breaking Medicine Technology:Mallinckrodt plc Announces Share Repurchase Program 2Mallinckrodt plc Announces Share Repurchase Program 3Mallinckrodt plc Announces Share Repurchase Program 4TPI's JCM Updates on Import Registration for International Clients 2TPI's JCM Updates on Import Registration for International Clients 3TPI's JCM Updates on Import Registration for International Clients 4Uroplasty Reports Record Revenue in Fiscal Third Quarter 2Uroplasty Reports Record Revenue in Fiscal Third Quarter 3Uroplasty Reports Record Revenue in Fiscal Third Quarter 4Uroplasty Reports Record Revenue in Fiscal Third Quarter 5Uroplasty Reports Record Revenue in Fiscal Third Quarter 6Uroplasty Reports Record Revenue in Fiscal Third Quarter 7Uroplasty Reports Record Revenue in Fiscal Third Quarter 8Uroplasty Reports Record Revenue in Fiscal Third Quarter 9Uroplasty Reports Record Revenue in Fiscal Third Quarter 10Uroplasty Reports Record Revenue in Fiscal Third Quarter 11Uroplasty Reports Record Revenue in Fiscal Third Quarter 12Uroplasty Reports Record Revenue in Fiscal Third Quarter 13Uroplasty Reports Record Revenue in Fiscal Third Quarter 14Uroplasty Reports Record Revenue in Fiscal Third Quarter 15Uroplasty Reports Record Revenue in Fiscal Third Quarter 16Uroplasty Reports Record Revenue in Fiscal Third Quarter 17Uroplasty Reports Record Revenue in Fiscal Third Quarter 18
... Soligenix, Inc. (OTCBB: SNGX) (Soligenix or the Company), ... for the second quarter of 2011. ... approximately $406,000 as compared to $445,000 for the second ... primarily a result of completion in April 2011 of ...
... LONDON, August 12, 2011 5 modules - ... Pharma IQ is delighted to announce that the Stability Testing Online Training ... industry agendas. ,The secret behind the Stability testing ... Dr. Manuel Zahn, is its user-friendly format which allows flexible and ...
Cached Medicine Technology:Soligenix Reports Second Quarter 2011 Financial Results and Reviews Accomplishments 2Soligenix Reports Second Quarter 2011 Financial Results and Reviews Accomplishments 3Soligenix Reports Second Quarter 2011 Financial Results and Reviews Accomplishments 4Soligenix Reports Second Quarter 2011 Financial Results and Reviews Accomplishments 5Stability Testing Course is Taking the Online Training Format by Storm! 2
... a national reference laboratory and a worldwide ... ARUP offers an extensive test menu of ... clinical and anatomic pathology. Owned by the ... more than half of the nation's university ...
... ARUP Laboratories is a national reference ... laboratory research and development. ARUP offers an ... unique medical tests in clinical and anatomic ... ARUP Laboratories' clients include more than half ...
... is a national reference laboratory and a ... development. ARUP offers an extensive test menu ... in clinical and anatomic pathology. Owned by ... include more than half of the nation's ...
... is a national reference laboratory and a ... development. ARUP offers an extensive test menu ... in clinical and anatomic pathology. Owned by ... include more than half of the nation's ...
Medicine Products: