HOME >> BIOLOGY >> NEWS
In a world of distortion, archer fish learn to judge absolute size of aerial prey

Anyone who has looked at the aerial world during an underwater dive will have marvelled at the distortions in apparent size, shape, and position of aerial objects. In a new study, researchers have shown that archer fish can learn to cope with these strongly viewpoint-dependent distortions, and this ability enables the fish to precisely judge from any underwater viewpoint the absolute size of their aerial prey. The work is reported by Stefan Schuster, now at the University of Erlangen-Nuremburg, and colleagues at the University of Freiburg.

Many animals are able to judge the absolute size of visual objects, a skill that becomes especially useful for tasks such as selecting prey. The ability to judge absolute size, however, requires that the visual system be able to perform a critical correction to account for distance between the eye and the viewed object: dramatic differences in the size of the actual retinal image occur as the distance between viewer and object changes. A situation in which this corrective requirement is especially challenging arises for animals that need to judge the size of aerial prey from an underwater vantage point. Here, as the study of Schuster and colleagues shows, the complex optical situation arising from distance and refraction requires precise understanding of the relationship between an object's apparent size and the fish's relative position to the object.

In the experiments reported by the researchers, archer fish viewed a set of eight disks at various heights above the water surface from various horizontal distances and selected one of the disks as a shooting target based only on its absolute size. Although nave fish often selected disks that would be too large to be swallowed, all could eventually learn to judge absolute size with great precision; in doing so, they perfectly accounted for the complex optical situation posed by their underwater viewpoint. In a series of experiments, the researchers showed that the f
'"/>

Contact: Heidi Hardman
hhardman@cell.com
617-397-2879
Cell Press
6-Sep-2004


Page: 1 2

Related biology news :

1. DuPont scientist named one of the worlds top young innovators by MITs Technology Review Magazine
2. Health of worlds sea lions the focus of Wakefield Symposium
3. Laboratory grows world record length carbon nanotube
4. Improved nutrition could reduce malaria burden worldwide
5. Study shows how consensus is attained in a noisy world
6. MSU group reviews Berkeley venture into brave new science funding world
7. From science fiction to reality: Nanomedicine brings fresh hope to the medical world
8. New world record magnet for chemical and biomedical research
9. Growing new breed of vaccine-producing plants to fight human diseases worldwide
10. Scientists describe the worlds smallest, lightest fish
11. Songbirds escaped from Australasia, conquered rest of world

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: world distortion archer fish learn judge absolute size aerial prey

(Date:2/10/2015)... 2015  Alere Inc. (NYSE: ALR), a global ... for the quarter ended December 31, 2014. ... of Alere said, "We made substantial progress in ... global leader in rapid diagnostics and delivering against ... divestiture in early January enabled us to substantially ...
(Date:2/5/2015)... PARK, N.C. , Feb. 5, 2015  Marken ... specialist logistics company and has launched a new marketing ... Clinical Logistics Organization (CLO).  The new campaign focuses on ... on patient, protocol and shipments. The first ... , aligns Marken,s priorities with its client,s priorities. ...
(Date:2/5/2015)... Jan. 27, 2015   Marvin Test ... deployed, innovative test solutions for military, aerospace, ... of its TS-323 GENASYS Test Platform ... (LMSSC). GENASYS is a high-performance PXI-based system ... applications that require performance functional testing. GENASYS ...
Breaking Biology News(10 mins):Alere Inc. Announces Fourth Quarter 2014 Results 2Alere Inc. Announces Fourth Quarter 2014 Results 3Alere Inc. Announces Fourth Quarter 2014 Results 4Alere Inc. Announces Fourth Quarter 2014 Results 5Alere Inc. Announces Fourth Quarter 2014 Results 6Alere Inc. Announces Fourth Quarter 2014 Results 7Alere Inc. Announces Fourth Quarter 2014 Results 8Alere Inc. Announces Fourth Quarter 2014 Results 9Alere Inc. Announces Fourth Quarter 2014 Results 10Alere Inc. Announces Fourth Quarter 2014 Results 11Alere Inc. Announces Fourth Quarter 2014 Results 12Alere Inc. Announces Fourth Quarter 2014 Results 13Alere Inc. Announces Fourth Quarter 2014 Results 14Alere Inc. Announces Fourth Quarter 2014 Results 15Alere Inc. Announces Fourth Quarter 2014 Results 16Alere Inc. Announces Fourth Quarter 2014 Results 17Alere Inc. Announces Fourth Quarter 2014 Results 18Alere Inc. Announces Fourth Quarter 2014 Results 19Alere Inc. Announces Fourth Quarter 2014 Results 20Alere Inc. Announces Fourth Quarter 2014 Results 21Alere Inc. Announces Fourth Quarter 2014 Results 22Alere Inc. Announces Fourth Quarter 2014 Results 23Alere Inc. Announces Fourth Quarter 2014 Results 24Alere Inc. Announces Fourth Quarter 2014 Results 25Alere Inc. Announces Fourth Quarter 2014 Results 26Alere Inc. Announces Fourth Quarter 2014 Results 27Alere Inc. Announces Fourth Quarter 2014 Results 28Alere Inc. Announces Fourth Quarter 2014 Results 29Alere Inc. Announces Fourth Quarter 2014 Results 30Alere Inc. Announces Fourth Quarter 2014 Results 31Alere Inc. Announces Fourth Quarter 2014 Results 32Alere Inc. Announces Fourth Quarter 2014 Results 33Alere Inc. Announces Fourth Quarter 2014 Results 34Alere Inc. Announces Fourth Quarter 2014 Results 35Alere Inc. Announces Fourth Quarter 2014 Results 36
(Date:2/27/2015)... Nova Scotia (PRWEB) February 27, 2015 ... been made aware of a fraudulent press release disseminated ... purporting to be from Immunovaccine. This press release states ... Gilead Science, Inc. The press release did not ... the information contained within the press release. Please ...
(Date:2/27/2015)... 2015 Research and Markets ( http://www.researchandmarkets.com/research/p2ddnr/global_market ) ... of Trypsin" report to their offering. , ... providing comprehensive data on Trypsin globally and regionally ( ... North America , Latin America ... Trypsin This report focuses on three primary areas; ...
(Date:2/27/2015)... -- Pfenex Inc. (NYSE MKT: PFNX), a clinical-stage biotechnology company ... that it will be presenting at CALBIO 2015 at ... at 3pm PST. Patrick Lucy, chief business officer of ... state of the biosimilar industry landscape entitled The ... more information on CALBIO 2015 and The Evolving ...
(Date:2/27/2015)... PureTech , a science and technology R&D company focused  ... in the healthcare sector, announced today the appointment of ... the Board of Directors of Sanofi, to its Board ... pleasure to know Chris for many years and I ... more closely now," said Dr. Robert Langer , ...
Breaking Biology Technology:Immunovaccine Disclaims Hoax Press Release 2Global Market Report of Trypsin 2014-2018 2Christopher Viehbacher, former CEO of Sanofi, Joins PureTech's Board of Directors 2Christopher Viehbacher, former CEO of Sanofi, Joins PureTech's Board of Directors 3Christopher Viehbacher, former CEO of Sanofi, Joins PureTech's Board of Directors 4
Cached News: