Navigation Links
The world is full of darkness, reflected in the physiology of the human retina, Penn researchers say
Date:10/5/2010

PHILADELPHIA - Physicists and neuroscientists from the University of Pennsylvania have linked the cell structure of the retina to the light and dark contrasts of the natural world, demonstrating the likelihood that the neural pathways humans use for seeing are adapted to best capture the world around us.

Researchers found that retinal ganglion cells that see darkness are more numerous and cluster closer together than those that see light, corresponding to the fact that the natural world contains more dark spots than light. Now physicists, and not just pessimists, see the world for the dark place it is.

The results suggest that the brain's separation of retinal circuitry into off and on mosaics that separately process dark and bright spots allows for structural adaptation to the natural scenes humans must see.

The team took the study a step further by constructing artificial images that matched the characteristics of the natural world and by testing what sorts of off and on mosaics best represented information from these images. According to the authors, the total flow of information peaked for mosaics with more densely clustered off cells, as in the human retina, suggesting that human vision has evolved to efficiently represent visual information in the natural world.

Researchers looked at the physiology of the retinal ganglion cells whose job it is to respond to a dark spot on a brighter background, simply called off cells, wondering why the brain would have clusters of off cells and not an even distribution across the retina. In addition to being more numerous and branching together in dense, bushy clusters, they also have smaller dendritic fields than the cells responsible for seeing light spots. By branching together more densely in clusters, they collect more synapses per visual angle. Thus, researchers concluded that the retina devotes more resources to processing dark contrasts, a natural capability reflected i
'/>"/>

Contact: Jordan Reese
jreese@upenn.edu
215-573-6604
University of Pennsylvania
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. BIO-key(R) International To Exhibit at Oracle OpenWorld
2. World leaders in infectious diseases convene to discuss emerging global viruses
3. Researchers document worlds mammals in crisis
4. Complete Genomics launches, becomes worlds first large-scale human genome sequencing company
5. Europe rallies behind nanotechnology to wean world from fossil fuels
6. Smithsonian perspective: Biodiversity in a warmer world
7. Take advantage of reduced pre-registration rates for the IOF World Congress on Osteoporosis
8. World Food Day brings attention to food security around the globe
9. Fitness in a changing world
10. Researchers uncover worlds oldest fossil impression of a flying insect
11. Providing toilets, safe water is top route to reducing world poverty: UN University
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
The world is full of darkness, reflected in the physiology of the human retina, Penn researchers say
(Date:11/18/2014)... , Nov. 17, 2014 The Parenteral Drug ... U.S. regulatory agencies will speak and at least seven more ... Conference at the Omni Shoreham Hotel in Washington ... once again to have significant support from the regulatory agencies ... Europe in our effort to help advance ...
(Date:11/11/2014)... Nov. 11, 2014  Forensicon, Inc., a ... pleased to announce the promotion of Yaniv Schiff ... Digital Forensics. In Schiff,s new role as Director, he ... of digital forensics examiners and provide leadership within the ... - http://photos.prnewswire.com/prnh/20141110/157719 Schiff joined ...
(Date:11/7/2014)... , November 6, 2014 Leading ... for better mobile security revolutionizing online transactions.  Companies in focus ... Holdings Ltd. (NYSE: BABA ), Google Inc. (NASDAQ: ... ), eBay Inc. (NASDAQ: EBAY ) and MasterCard ... NXTD and NXTDW), a biometric authentication company focused on ...
Breaking Biology News(10 mins):FDA's Janet Woodcock, EMA's Emer Cooke Headline PDA Quality Metrics Conference 2Yaniv Schiff Promoted to Director of Digital Forensics at Forensicon, Inc. 2Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 2Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 3Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 4Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 5Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 6
... wrong place to protect vulnerable coral reefs from the effects ... Now the team led jointly by Newcastle University and ... action is needed to prevent the collapse of this important ... PLoS ONE , is the largest study of its ...
... science" breakthrough by Queen,s University researchers into regulating a ... will help prevent heart attacks and strokes. ... the study focuses on the effects of Viagra ... to treat pulmonary hypertension. The team,s findings will ...
... in the Olympics, but scientists have raced cane toads in ... to invade Melbourne, Adelaide or Hobart and are unlikely to ... According to research by Dr Michael Kearney, from the ... from Australia and the USA, the cane toad,s march will ...
Cached Biology News:No-take zones offer no boost for bleached reefs 2Study points to potential new use for Viagra 2Racing cane toads reveals they get cold feet on Southern Australia invasion 2Racing cane toads reveals they get cold feet on Southern Australia invasion 3
(Date:11/22/2014)... Frederick, MD (PRWEB) November 21, 2014 ... sample management solutions provider, has released Limfinity® version ... more installation projects of Limfinity® than ever in ... majority configuration and minority framework enhancement. Limfinity® version ... goes far above and beyond bug fixes! , ...
(Date:11/22/2014)... , November 21, 2014   ... als Chief Commercial Officer zu KLOX    ... Unternehmensentwicklung und Chief Financial Officer bestellt    ... der Vermarktung seines jüngst zugelassenen Behandlungssystems zur Wundheilung zu ... bzw. das "Unternehmen") ist sehr erfreut, die folgenden personellen ...
(Date:11/21/2014)... (PRWEB) November 20, 2014 Author Matthew ... Walk to the Other Side” published as a ... Finalist in the “Fiction: Short Story” category of the ... Keen, President and CEO of USA Book News, said ... and independent publishers, including Simon & Schuster, Penguin, John ...
(Date:11/21/2014)... CA (PRWEB) November 21, 2014 Why ... that makes Albert Einstein so instantly recognizable? Why have ... physicist, mathematician, astronomer and author Hilton Ratcliffe seeks out ... have nothing at all to do with science. In ... Harbor Publishing , November 21, 2014), Ratcliffe puts it ...
Breaking Biology Technology:RURO Announces Limfinity® version 5.1.4 2KLOX Technologies meldet Neubesetzung von Führungspositionen 2KLOX Technologies meldet Neubesetzung von Führungspositionen 3KLOX Technologies meldet Neubesetzung von Führungspositionen 4KLOX Technologies meldet Neubesetzung von Führungspositionen 5Mystic Ink 's Short Story Collection “A Short Walk to the Other Side” Honoring Ray Bradbury Praised As Award-Winning Finalist In USA Best Book Awards 2Mystic Ink 's Short Story Collection “A Short Walk to the Other Side” Honoring Ray Bradbury Praised As Award-Winning Finalist In USA Best Book Awards 3Mystic Ink 's Short Story Collection “A Short Walk to the Other Side” Honoring Ray Bradbury Praised As Award-Winning Finalist In USA Best Book Awards 4“Stephen Hawking Smoked My Socks” Sparks Controversy in Science World 2“Stephen Hawking Smoked My Socks” Sparks Controversy in Science World 3“Stephen Hawking Smoked My Socks” Sparks Controversy in Science World 4
... Mass., Aug. 6 Repligen Corporation (Nasdaq: RGEN ) ... June 30, 2009. Total revenue for the quarter was $5,061,000 ... fiscal year 2009. The prior year results were favorably impacted ... royalties on the U.S. sales of Orencia(R) prior to the April ...
... RICHLAND, Wash. -- To use hydrogen as a clean energy ... molecule, rather than compressing the gas into a tank. A ... out of a molecule requires a catalyst. Now, researchers reveal ... step toward designing catalysts for use in hydrogen energy applications ...
... Exciton Technologies Inc. today announced that the Company ... and Drug Administration (FDA) to market exSALT(TM) SD7 ... coating technology utilizing silver oxysalts as the active ... effort and a strong belief in our product," ...
Cached Biology Technology:Repligen Reports First Quarter Fiscal Year 2010 Financial Results 2Repligen Reports First Quarter Fiscal Year 2010 Financial Results 3Repligen Reports First Quarter Fiscal Year 2010 Financial Results 4Repligen Reports First Quarter Fiscal Year 2010 Financial Results 5Repligen Reports First Quarter Fiscal Year 2010 Financial Results 6Repligen Reports First Quarter Fiscal Year 2010 Financial Results 7New clues about a hydrogen fuel catalyst 2New clues about a hydrogen fuel catalyst 3Exciton Technologies receives FDA approval to market exSALT(TM) 2Exciton Technologies receives FDA approval to market exSALT(TM) 3
... Mouse polyclonal antibody raised ... Immunogen: ... 646 a.a) partial recombinant protein ... Accession Number: NM_006842 ...
Mouse monoclonal antibody to UGT2B10 - UDP glucuronosyltransferase 2 family, polypeptide B10...
... kit is a sample preparation kit for ... removal of detergents, phenolic compounds, salts, and ... dilute samples. The kit procedure involves a ... tissue or cells, plant leaves, E. coli, ...
... Factor XIII in both reduced and non-reduced ... XIII B-chain or human Factor XII. Factor XIII ... composed of two subunits. Factor XIII-A is the ... 160kDa. Factor XIII is present in plasma as ...
Biology Products: