Navigation Links
Duke team explains a longtime visual puzzler in new way
Date:10/13/2008

Durham, N.C. A team of neuroscientists at Duke University Medical Center has suggested an entirely new way to explain a puzzling visual phenomenon called the flash-lag effect.

Experts have debated for the past 100 years about why -- when a flash of light is presented in alignment with a moving object -- the flash is perceived to lag behind the position of the object.

"The point of this paper was to present a completely different way of thinking about how this effect can and should be explained," said Dale Purves, M.D., professor of neurobiology and director of the Duke Center for Cognitive Neuroscience. "We decided to look at the effect empirically, based on another visual problem, called the inverse optics problem, which is that the image on your retina can't be directly, logically related to what is happening in the world."

Objects moving at many different speeds and in different directions in the real world can generate the same speed on your retina, Purves said.

The Duke scientists asked how it is that humans routinely make correct behavioral choices in the world "when we can't know from the information on our retinas what is actually out there," Purves said.

"The solution lies in humans accumulating, over millions of years of trial-and-error, the information that derives from seeing a speed on the retina and making a move in response, which either works or doesn't," Purves said. "You ultimately die or you survive based on the success of what you do in the world, and if you do survive, the improvements in visual circuitry that allowed this success are passed on to the next generation. This is standard evolutionary thinking. Eventually, you end up with a system that can make the link between what is really in the world and what is recorded on your retina."

The study was published in PNAS Early Edition online on October 13.

Other explanations of the flash-lag effect have included the
'/>"/>

Contact: Mary Jane Gore
mary.gore@duke.edu
919-660-1309
Duke University Medical Center
Source:Eurekalert

Page: 1 2

Related biology news :

1. Research explains link between cholesterol and heart disease
2. Prehistoric aesthetics explains snail biogeography puzzle
3. New research explains link between smoking and SIDS
4. Professors video series explains all facets of Earth
5. Genetic breakthrough explains dangerously high blood glucose levels
6. Mechanism explains link between apolipoprotein E and Alzheimers disease
7. UGA researchers discover mechanism that explains how cancer enzyme winds up on ends of chromosomes
8. Brains timing linked with timescales of the natural visual world
9. The human brain: Detective of auditory and visual change
10. Researchers visualize complex pigment mixtures in living cells
11. Visual technology enables brain to learn in new ways
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/15/2014)... , Oct. 15, 2014 Sandata Technologies, ... home and community-based care, today announced it released ... Sandata,s Santrax® Electronic Visit Verification™ Solution (EVV™)  for ... a home health company founded in 1996 and ... . The study details the ...
(Date:10/15/2014)... linked increased resistance to bacterial pneumonia in female mice ... estrogen. , Females are naturally more resistant to respiratory ... has shown that increased resistance to bacterial pneumonia in ... synthase 3 (NOS3). They also show that this enzyme ... sex hormone estrogen. , The team, lead by Professor ...
(Date:10/14/2014)... Cancer Research shows SIRT6—a protein known to ... the development of skin cancers by turning on an ... skin cells. , Previously considered protective, SIRT6 is part ... help regulate genomic stability and prevent some of the ... damage, which can lead to cancer. This study, in ...
Breaking Biology News(10 mins):Sandata Announces Case Study with Quality Care Services, Inc. 2Two-faced gene: SIRT6 prevents some cancers but promotes sun-induced skin cancer 2
... Mass. Joshua Kritzer, assistant professor in the School ... University, has been awarded one of 33 NIH Director,s ... awarded by the National Institutes of Health. The ... to support unusually creative new investigators with highly innovative ...
... -- November 12, 2010 --Canadian biologist Chris Wood was ... Science. The Award was presented by Dr. Philip Campbell, ... for Graduate Studies annual meeting in Toronto earlier this ... Royal Society of Canada, is a professor in the ...
... Powdery mildew is a fungus that infects both crop and ... cause immense crop loss. Despite decades of intense research, little ... to invade the host,s epidermal cells. A European research group ... of Zurich, now published a study in Science ...
Cached Biology News:Tufts University chemist earns prestigious award for promising research on drug development 2Nature honors outstanding faculty mentor 2Fertility or powdery mildew resistance? 2Fertility or powdery mildew resistance? 3
(Date:10/25/2014)... According to new market research ... Types (Colocation, Enterprise, Telecom), by Design Types (Electrical, ... 2, Tier 3, Tier 4) - Global Forecast ... the Data Center Construction Market into various segments ... This research report also identifies the factors driving ...
(Date:10/25/2014)... 2014 SonaCare Medical, LLC, leader ... technology, announced that its Board of Directors has ... Officer, President and member of the Board effective ... take-on expanded responsibilities within the company, including further ... overseeing commercialization, manufacturing and finance. , Dr. ...
(Date:10/25/2014)... Biopharmaceuticals, Inc. (OTCBB: RGRX) ("the Company" or "RegeneRx") today ... on Thymosins in Health and Disease in ... beta 4 (TB4) linked with rhodamine (a fluorescent tracer ... rodent model of stroke, it was visualized outside of ... tissue of the brain).   The leakage of TB4 in ...
(Date:10/22/2014)... -- Research and Markets has announced ... Market (Product types, Application, Technology, End User and ... Demand, Insights, Analysis, Research, Report, Opportunities, Segmentation and ... offering. This new report titled, ... and Geography) Global Size, Industry Analysis, Trends, Opportunities, ...
Breaking Biology Technology:Data Center Construction Market Worth $22.73 Billion by 2019 - New Report by MarketsandMarkets 2Data Center Construction Market Worth $22.73 Billion by 2019 - New Report by MarketsandMarkets 3Data Center Construction Market Worth $22.73 Billion by 2019 - New Report by MarketsandMarkets 4SonaCare Medical Board of Directors Appoints Dr. Mark Carol as CEO and President 2SonaCare Medical Board of Directors Appoints Dr. Mark Carol as CEO and President 3Researchers Report Thymosin Beta 4 Crosses Blood-Brain Barrier In Animal Stroke Model 2Global DNA Diagnostics Market (Product types, Application, Technology, End User and Geography) - Forecast to 2020 2Global DNA Diagnostics Market (Product types, Application, Technology, End User and Geography) - Forecast to 2020 3
... recent report that probably went unnoticed outside the academic ... released figures that show why the rest of us ... for scientific research. The numbers demonstrate that investment in ... it's about creating jobs for the 21st century economy. ...
... Technical College would like to see more women going into ... women in IT careers has declined from a high of 41 ... And at MATC, enrollment of women in IT programs has dropped ... IT Expo at the college on Wednesday was Patricia Prime, ...
... . and Imaxio S.A. (Saint-Beauzire, France) have ... manufacture and sell OverExpress bacterial cells for ... retain the right to license the use of OverExpress ... cells to commercial licensees. No license will be required ...
Cached Biology Technology:Tapping hidden assets: Wisconsin researchers who can create jobs 2Tapping hidden assets: Wisconsin researchers who can create jobs 3Tapping hidden assets: Wisconsin researchers who can create jobs 4MATC seeks to turn around falling tech enrollment among women 2Lucigen Corp. enters global licensing agreement 2
Whole blood is collected from mice (Swiss Webster, 8-10 weeks old,either sex) and processed within 45 minutes of collection. The complement is then filtered and pooled on ice, bottled and stored at -...
... incorporating the sophisticated DirectDrive architecture and ... Varian NMR System is undeniably the ... Varian NMR System features parallel controllers ... providing pulse sequence programming power with ...
... Anti-HMGN2/HMG-17 Immunogen : Recombinant ... pH7.4, 5mg/ml BSA, 0.15M NaCl, ... addition of glycerol to 30% ... immunoblot on acid extracts of ...
Luminometers...
Biology Products: