Edge detection in landing budgerigars (Melopsittacus undulatus).

<h4>Background</h4>While considerable scientific effort has been devoted to studying how birds navigate over long distances, relatively little is known about how targets are detected, obstacles are avoided and smooth landings are orchestrated. Here we examine how visual features in the e...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Partha Bhagavatula, Charles Claudianos, Michael Ibbotson, Mandyam Srinivasan
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2009
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7d3dd2ab31584e4d919a2593413d10eb
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:7d3dd2ab31584e4d919a2593413d10eb
record_format	dspace
spelling	oai:doaj.org-article:7d3dd2ab31584e4d919a2593413d10eb2021-11-25T06:19:52ZEdge detection in landing budgerigars (Melopsittacus undulatus).1932-620310.1371/journal.pone.0007301https://doaj.org/article/7d3dd2ab31584e4d919a2593413d10eb2009-10-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19809500/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>While considerable scientific effort has been devoted to studying how birds navigate over long distances, relatively little is known about how targets are detected, obstacles are avoided and smooth landings are orchestrated. Here we examine how visual features in the environment, such as contrasting edges, determine where a bird will land.<h4>Methodology/principal findings</h4>Landing in budgerigars (Melopsittacus undulatus) was investigated by training them to fly from a perch to a feeder, and video-filming their landings. The feeder was placed on a grey disc that produced a contrasting edge against a uniformly blue background. We found that the birds tended to land primarily at the edge of the disc and walk to the feeder, even though the feeder was in the middle of the disc. This suggests that the birds were using the visual contrast at the boundary of the disc to target their landings. When the grey level of the disc was varied systematically, whilst keeping the blue background constant, there was one intermediate grey level at which the budgerigar's preference for the disc boundary disappeared. The budgerigars then landed randomly all over the test surface. Even though this disc is (for humans) clearly distinguishable from the blue background, it offers very little contrast against the background, in the red and green regions of the spectrum.<h4>Conclusions</h4>We conclude that budgerigars use visual edges to target and guide landings. Calculations of photoreceptor excitation reveal that edge detection in landing budgerigars is performed by a color-blind luminance channel that sums the signals from the red and green photoreceptors, or, alternatively, receives input from the red double-cones. This finding has close parallels to vision in honeybees and primates, where edge detection and motion perception are also largely color-blind.Partha BhagavatulaCharles ClaudianosMichael IbbotsonMandyam SrinivasanPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 4, Iss 10, p e7301 (2009)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Partha Bhagavatula Charles Claudianos Michael Ibbotson Mandyam Srinivasan Edge detection in landing budgerigars (Melopsittacus undulatus).
description	<h4>Background</h4>While considerable scientific effort has been devoted to studying how birds navigate over long distances, relatively little is known about how targets are detected, obstacles are avoided and smooth landings are orchestrated. Here we examine how visual features in the environment, such as contrasting edges, determine where a bird will land.<h4>Methodology/principal findings</h4>Landing in budgerigars (Melopsittacus undulatus) was investigated by training them to fly from a perch to a feeder, and video-filming their landings. The feeder was placed on a grey disc that produced a contrasting edge against a uniformly blue background. We found that the birds tended to land primarily at the edge of the disc and walk to the feeder, even though the feeder was in the middle of the disc. This suggests that the birds were using the visual contrast at the boundary of the disc to target their landings. When the grey level of the disc was varied systematically, whilst keeping the blue background constant, there was one intermediate grey level at which the budgerigar's preference for the disc boundary disappeared. The budgerigars then landed randomly all over the test surface. Even though this disc is (for humans) clearly distinguishable from the blue background, it offers very little contrast against the background, in the red and green regions of the spectrum.<h4>Conclusions</h4>We conclude that budgerigars use visual edges to target and guide landings. Calculations of photoreceptor excitation reveal that edge detection in landing budgerigars is performed by a color-blind luminance channel that sums the signals from the red and green photoreceptors, or, alternatively, receives input from the red double-cones. This finding has close parallels to vision in honeybees and primates, where edge detection and motion perception are also largely color-blind.
format	article
author	Partha Bhagavatula Charles Claudianos Michael Ibbotson Mandyam Srinivasan
author_facet	Partha Bhagavatula Charles Claudianos Michael Ibbotson Mandyam Srinivasan
author_sort	Partha Bhagavatula
title	Edge detection in landing budgerigars (Melopsittacus undulatus).
title_short	Edge detection in landing budgerigars (Melopsittacus undulatus).
title_full	Edge detection in landing budgerigars (Melopsittacus undulatus).
title_fullStr	Edge detection in landing budgerigars (Melopsittacus undulatus).
title_full_unstemmed	Edge detection in landing budgerigars (Melopsittacus undulatus).
title_sort	edge detection in landing budgerigars (melopsittacus undulatus).
publisher	Public Library of Science (PLoS)
publishDate	2009
url	https://doaj.org/article/7d3dd2ab31584e4d919a2593413d10eb
work_keys_str_mv	AT parthabhagavatula edgedetectioninlandingbudgerigarsmelopsittacusundulatus AT charlesclaudianos edgedetectioninlandingbudgerigarsmelopsittacusundulatus AT michaelibbotson edgedetectioninlandingbudgerigarsmelopsittacusundulatus AT mandyamsrinivasan edgedetectioninlandingbudgerigarsmelopsittacusundulatus
_version_	1718413809588109312

Edge detection in landing budgerigars (Melopsittacus undulatus).

Ejemplares similares