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:8/21/2014)... in the coronary arteries of chronic kidney disease patients ... according to a new study in the Journal ... ). Researchers at the Johns Hopkins Bloomberg School of ... commonly used measures of subclinical atherosclerosis in predicting the ... , Approximately 50 percent of all patients with chronic ...
(Date:8/21/2014)... 21, 2014 Pulmonary Hypertension Association ... Education Forum for PH patients and families to ... Pulmonary Hypertension Association – the country’s leading ... to prevent and cure pulmonary hypertension (PH) – ... functioning of the heart and can lead right ...
(Date:8/21/2014)... environmental source of fungal infections that have been sickening ... grows on trees. , The discovery is based on ... the summer gathering soil and tree samples from areas ... fungus named Cryptococcus gattii (CRIP-to-cock-us GAT-ee-eye). ... of species including C. gattii , causes life-threatening ...
(Date:8/21/2014)... 2014 (HealthDay News) -- Black mothers are less likely ... one possible reason why: Hospitals in neighborhoods with many ... in areas with more white residents, a U.S. government ... much less common in medical centers where the black ... Centers for Disease Control and Prevention reported Thursday. ...
(Date:8/21/2014)... (HealthDay News) -- Among seniors, dimming vision may be ... involved more than 2,500 people, aged 65 to 84, who ... two, six and eight years later. Vision loss over ... of death during the study period, the researchers reported. ... by Sharon Christ of Purdue University in West Lafayette, Ind., ...
Breaking Medicine News(10 mins):Health News:Measuring calcium buildup to predict heart disease in those with chronic kidney disease 2Health News:Pulmonary Hypertension Association Goes On the Road to Houston With an Education Forum for PH Patients and Families to Help Fight Rare Lung Disease 2Health News:Pulmonary Hypertension Association Goes On the Road to Houston With an Education Forum for PH Patients and Families to Help Fight Rare Lung Disease 3Health News:Fungus deadly to AIDS patients found to grow on trees 2Health News:Racial Disparities in Breast-Feeding May Start With Hospitals, Study Suggests 2Health News:Failing Vision Tied to Shorter Lifespans for Seniors 2
... activities and helping others is not just good for the ... other addicts become and stay sober, a researcher from Case ... review article published in the Volume 29 issue of ... of psychiatry at the School of Medicine, sheds light on ...
... , FRIDAY, Jan. 28 (HealthDay News) -- A new ... work better in people with high levels of a certain protein ... Researchers found that the drugs work the same -- at ... diabetics -- regardless of the results of a test that looks ...
... Salamon HealthDay Reporter , THURSDAY, Jan. 27 (HealthDay ... opening in his small Louisiana town, where vacant storefronts have ... an assistant professor of sociology at Southeastern Louisiana University, wasn,t ... flat-screened TVs -- one in every booth -- along with ...
... Celiac disease and Crohn,s disease share several genetic risk factors, ... hard to absorb nutrients properly, is an inherited autoimmune disease ... by gluten and other protein found in wheat and some ... disease. An international team of researchers conducted a meta-analysis ...
... type of breast cancer in older women estrogen and ... to a protein that fends off aging-related cellular damage. ... Gius, M.D., Ph.D., now shows how a deficiency in this ... develop. The findings, published in Molecular Cell , ...
... THURSDAY, Jan. 27 (HealthDay News) -- Arizona Congresswoman Gabrielle ... stunning step forward for the lawmaker who was shot ... at TIRR Memorial Hermann Hospital could last several months. ... planned to insert a valve into her breathing tube, ...
Cached Medicine News:Health News:Helping others helps alcoholics stay on the road to recovery, Case Western Reserve shows 2Health News:Helping others helps alcoholics stay on the road to recovery, Case Western Reserve shows 3Health News:Blood Protein Level May Not Influence Effectiveness of Statins 2Health News:TV: A Sneaky Part of the Food Pyramid 2Health News:TV: A Sneaky Part of the Food Pyramid 3Health News:Protein related to aging holds breast cancer clues 2Health News:Rep. Giffords' Intensive Rehab Under Way 2Health News:Rep. Giffords' Intensive Rehab Under Way 3
(Date:8/21/2014)... FAIRFAX, Va. , Aug. 21, 2014 /PRNewswire/ ... real-time quality and Manufacturing Intelligence , today ... Intelligence Conference. The event will be held Oct. ... Mile, and is designed to showcase the necessity ... use of metrics and Manufacturing Intelligence to gain ...
(Date:8/21/2014)... 21, 2014  AliveCor, Inc. announced today ... (FDA) has granted the company clearance for ... the most common form of cardiac arrhythmia. ... if patients are experiencing AFib through real-time ... phone based AliveCor® Heart Monitor, so physicians ...
(Date:8/21/2014)...  The board of directors of VirtualScopics, Inc. (NASDAQ: ... trial imaging solutions, today announced that James Groff ... immediately.  Mr. Groff has held the role of acting ... in January 2006 as an accounting manager and was ... the board of VirtualScopics asked Jim to assume the ...
Breaking Medicine Technology:InfinityQS to Host Manufacturing Intelligence Conference in Chicago 2AliveCor Receives First FDA Clearance to Detect a Serious Heart Condition in an ECG on a Mobile Device 2VirtualScopics, Inc. Names James Groff Chief Financial Officer 2VirtualScopics, Inc. Names James Groff Chief Financial Officer 3VirtualScopics, Inc. Names James Groff Chief Financial Officer 4
... Pharmaceuticals, Inc. (Nasdaq: TRBN ) today announced financial ... Sept. 30, 2009. , (Logo: http://www.newscom.com/cgi-bin/prnh/20090320/TRUBIONLOGO ) , ... , Revenue for the third quarter and ... and $12.8 million, respectively, compared with $3.8 million and ...
... SADDLE RIVER, N.J., Nov. 5 PDI, Inc. (Nasdaq: PDII), ... to U.S. pharmaceutical companies, today reported financial and operational results ... Commenting on today,s announcement, Nancy Lurker, Chief Executive Officer of ... were lower than last year by approximately 14%. Higher ...
Cached Medicine Technology:Trubion Pharmaceuticals, Inc. Reports Third Quarter and Nine Months 2009 Financial Results 2Trubion Pharmaceuticals, Inc. Reports Third Quarter and Nine Months 2009 Financial Results 3Trubion Pharmaceuticals, Inc. Reports Third Quarter and Nine Months 2009 Financial Results 4Trubion Pharmaceuticals, Inc. Reports Third Quarter and Nine Months 2009 Financial Results 5Trubion Pharmaceuticals, Inc. Reports Third Quarter and Nine Months 2009 Financial Results 6Trubion Pharmaceuticals, Inc. Reports Third Quarter and Nine Months 2009 Financial Results 7PDI Reports 2009 Third Quarter Financial Results 2PDI Reports 2009 Third Quarter Financial Results 3PDI Reports 2009 Third Quarter Financial Results 4PDI Reports 2009 Third Quarter Financial Results 5PDI Reports 2009 Third Quarter Financial Results 6PDI Reports 2009 Third Quarter Financial Results 7PDI Reports 2009 Third Quarter Financial Results 8PDI Reports 2009 Third Quarter Financial Results 9PDI Reports 2009 Third Quarter Financial Results 10PDI Reports 2009 Third Quarter Financial Results 11
Extremely wide blade opening. Excellent bio and MRI compatibility. Lot number on each clip. Long reliable history. Fenestrated large type 1/1 (mm), opening width 8.0 mm and length 7.5 mm....
Extremely wide blade opening. Excellent bio and MRI compatibility. Lot number on each clip. Long reliable history. Fenestrated large type 1/1 (mm), opening width 7.0 mm and length 10 mm....
Extremely wide blade opening. Excellent bio and MRI compatibility. Lot number on each clip. Long reliable history. Large type 1/1 (mm), opening width 10.0 mm and length 10 mm....
Extremely wide blade opening. Excellent bio and MRI compatibility. Lot number on each clip. Long reliable history. Large type 1/1 (mm), opening width 8.0 mm and length 9 mm....
Medicine Products: