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:7/26/2017)... ... July 26, 2017 , ... The Amnesty Rally 2017 will be ... Park at 3313 Bernstein Park Drive in Monroe (adjacent to the Louisiana Purchase Gardens ... help reduce gun violence throughout Monroe. Citizens can turn in unregistered, illegally-held and imitation ...
(Date:7/26/2017)... ... 26, 2017 , ... BioPlus Specialty Pharmacy (BioPlus), ... of the HCV Treatment Path app (version 4.4.0) to keep health care providers ... All of the latest HCV medications are included in this app, including Vosevi™ ...
(Date:7/25/2017)... (PRWEB) , ... July 25, 2017 , ... “Now Hiring!” ... St. Louis, Missouri. The company has achieved record-breaking sales for over 30 consecutive ... the next 12 months. , The upcoming year offers excitement and growth at HDIS, ...
(Date:7/25/2017)... Florida (PRWEB) , ... July 25, 2017 , ... ... Jennifer Haller, to the sales department joining as Regional Account Manager for the ... with contracted customers in the liquidation of their obsolete medical assets. , Jennifer ...
(Date:7/25/2017)... ... July 25, 2017 , ... SureVest Insurance Group, a locally ... across North Carolina, is launching a charity event in conjunction with the Triangle ... ongoing fight against bladder cancer. , The Bladder Cancer Advocacy Network (BCAN) operates ...
Breaking Medicine News(10 mins):
(Date:7/12/2017)...  Eli Lilly and Company (NYSE: LLY ) ... resolve pending patent litigation in the U.S. District Court for ... the Cialis ® (tadalafil) unit dose patent. This patent ... part of the agreement, Cialis exclusivity is now expected to ... "The unit dose patent for Cialis is valid and infringed ...
(Date:7/11/2017)... , July 11, 2017  Sysmex America, Inc., ... diagnostic testing equipment as well as middleware information ... way to make quality assurance easier and more ... is well known for the innovation that it ... Monitor elevates quality assurance processes to a new ...
(Date:7/10/2017)... , July 10, 2017 The Institute for ... methods, is the recipient of a VITROCELL® inhalation exposure ... International Science Consortium. The device, which is designed to ... expose human lung cells to airborne test materials in ... use the VITROCELL® system for testing combustible tobacco products, ...
Breaking Medicine Technology:
Cached News: