HOME >> MEDICINE >> NEWS
Laser measurements reveal biological basis of distance perception

Using a laser range-finder, neurobiologists have scanned real-life scenes to gather millions of distance measurements to surfaces in each scene -- analyzing the mass of data to explain a series of long-known but little-understood quirks in how people judge distances.

The measurements reveal, for example, that the tendency of people to estimate the distance of isolated objects as being six to 12 feet away arises because that is the average distance of actual objects and surfaces in the visual scenes people encounter.

Thus, said the Duke University Medical Center neurobiologists, the findings support their theory that the visual system has evolved to make the best statistical guess about distances and other features of visual scenes, based on past experience.

The researchers, Zhiyong Yang and Dale Purves, published their findings in the June 2003 issue of "Nature Neuroscience" (online version posted May 18, 2003). Their research was supported by the National Institutes of Health and the Geller Endowment. Yang is a postdoctoral fellow and Purves is the George B. Geller Professor for Research in Neurobiology.

"All the characteristics of the visual world that we take for granted -- for example the diminution of size with distance -- are a result of perception," said Purves. "So, a question for centuries has been, 'What is the biological reason we see space in the peculiar way that we do?'"

In their past research on the perception of the geometry, color, brightness and motion, Purves and his colleagues have accumulated evidence that visual processing is not the result of logical calculations about the image that falls on the retina of the eye as such. Rather, they have shown that vision is a fundamentally empirical phenomenon, in which the connections between nerve cells in the visual system evolved as a result of the success of organisms that correctly interpreted the inherently ambiguous visual world. Such ambiguity arises because the photons
'"/>

Contact: Dennis Meredith
dennis.meredith@duke.edu
919-681-8054
Duke University
20-May-2003


Page: 1 2 3

Related medicine news :

1. Laser surgery offers advantages for voice disorders
2. Laser method identifies, counts toxic molecules
3. Laser therapy offers hope for acne sufferers
4. Beckman Laser Institute to improve breast cancer detection
5. Laser technique able to detect developing cavities
6. Laser technology helps measure pollution from NYC buses
7. Laser research yields precision breath analysis tool for asthma diagnosis (treatment)
8. Laser procedure effective in correcting nasal blockages associated with deviated septum
9. Lasers light way to 3-D imaging in Purdue lab
10. Laser heart treatment shown to be safe and effective at lowering pain associated with heart disease
11. Laser Pointer Helps Parkinsons Patients Take Next Step

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:5/29/2016)... Carolina (PRWEB) , ... May 29, 2016 , ... Whole ... wide jaw clipper that has been available via Amazon.com. This new style of ... thick nails. , The jaw opening is approximately 4mm and the actual handle is ...
(Date:5/28/2016)... , ... May 28, 2016 , ... May 26, 2016- ... Martial Arts Fighting Challenge with theme event of “K Warriors” on June 4, 2016 ... 36608. , The event is sponsored and hosted by Shaolin Institute and sanctioned ...
(Date:5/27/2016)... ... ... Two director-level employees of Horizon Blue Cross Blue Shield of New Jersey (BCBSNJ) ... The award recognizes businesswomen who excel in their fields and who have made significant ... Long-Term Services and Supports) Program at Horizon NJ Health and Theresa Ponton, Director of ...
(Date:5/27/2016)... ... May 27, 2016 , ... An educational ... by inspiring human-interest stories, courtesy of awareness-driven celebrities and thought leaders. It also ... advocates, associations and industry leaders such as Bioness. , As patients feel ...
(Date:5/27/2016)... ... 2016 , ... Each year Standard Process Inc. ... this year’s Life University winner of a $2,500 scholarship from Standard ... Awards ceremony. , Outerbridge is approaching her last quarter at Life University in ...
Breaking Medicine News(10 mins):
(Date:5/25/2016)... GERMANTOWN, Maryland , May 25, ... Therawis bedient dringenden Bedarf ... QIAGEN N.V. (NASDAQ: QGEN ; ... Lizenz- und Entwicklungsvereinbarung mit Therawis Diagnostics GmbH zur ... eingegangen zu sein. Ein erstes Projekt wird die ...
(Date:5/25/2016)... YORK , May 25, 2016  According to ... reached $381 billion in 2015.  Though these are ... plenty of opportunity for success for companies that ... in search of new growth prospects medical device ... on research and development (R&D) than do companies ...
(Date:5/25/2016)... 2016  Granger Diagnostics today announced immediate availability of ... infections. This test ensures discovery of ALL bacteria, ... test requires only a simple swab of the wound ... G. Bostwick , MD, Chief Medical Officer, described ... "We are excited to make available, for the ...
Breaking Medicine Technology:
Cached News: