Visual acuity of budgerigars for moving targets
For a bird, it is often vital to visually detect food items, predators, or individuals from the same flock, i.e. moving stimuli of various shapes. Yet, behavioural tests of visual spatial acuity traditionally use stationary gratings as stimuli. We have behaviourally tested the ability of budgerigars...
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The Company of Biologists
2021
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oai:doaj.org-article:71d4ae215e074b219a8dc8ff3ec7dfa82021-11-28T16:01:19ZVisual acuity of budgerigars for moving targets2046-639010.1242/bio.058796https://doaj.org/article/71d4ae215e074b219a8dc8ff3ec7dfa82021-09-01T00:00:00Zhttp://bio.biologists.org/content/10/9/bio058796https://doaj.org/toc/2046-6390For a bird, it is often vital to visually detect food items, predators, or individuals from the same flock, i.e. moving stimuli of various shapes. Yet, behavioural tests of visual spatial acuity traditionally use stationary gratings as stimuli. We have behaviourally tested the ability of budgerigars (Melopsittacus undulatus) to detect a black circular target, moving semi-randomly at 1.69 degrees s−1 against a brighter background. We found a detection threshold of 0.107±0.007 degrees of the visual field for a target size corresponding to a resolution of a grating with a spatial frequency of 4.68 cycles degree−1. This detection threshold is lower than the resolution limit for gratings but similar to the threshold for stationary single objects of the same shape. We conclude that the target acuity of budgerigars for moving single targets, just as for stationary single targets, is lower than their acuity for gratings.Sandra ChaibJuliane Gaviraghi MussoiOlle LindAlmut KelberThe Company of Biologistsarticlebird visionvisual resolutiondynamic acuitytarget detectionobject detectionScienceQBiology (General)QH301-705.5ENBiology Open, Vol 10, Iss 9 (2021) |
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bird vision visual resolution dynamic acuity target detection object detection Science Q Biology (General) QH301-705.5 |
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bird vision visual resolution dynamic acuity target detection object detection Science Q Biology (General) QH301-705.5 Sandra Chaib Juliane Gaviraghi Mussoi Olle Lind Almut Kelber Visual acuity of budgerigars for moving targets |
| description |
For a bird, it is often vital to visually detect food items, predators, or individuals from the same flock, i.e. moving stimuli of various shapes. Yet, behavioural tests of visual spatial acuity traditionally use stationary gratings as stimuli. We have behaviourally tested the ability of budgerigars (Melopsittacus undulatus) to detect a black circular target, moving semi-randomly at 1.69 degrees s−1 against a brighter background. We found a detection threshold of 0.107±0.007 degrees of the visual field for a target size corresponding to a resolution of a grating with a spatial frequency of 4.68 cycles degree−1. This detection threshold is lower than the resolution limit for gratings but similar to the threshold for stationary single objects of the same shape. We conclude that the target acuity of budgerigars for moving single targets, just as for stationary single targets, is lower than their acuity for gratings. |
| format |
article |
| author |
Sandra Chaib Juliane Gaviraghi Mussoi Olle Lind Almut Kelber |
| author_facet |
Sandra Chaib Juliane Gaviraghi Mussoi Olle Lind Almut Kelber |
| author_sort |
Sandra Chaib |
| title |
Visual acuity of budgerigars for moving targets |
| title_short |
Visual acuity of budgerigars for moving targets |
| title_full |
Visual acuity of budgerigars for moving targets |
| title_fullStr |
Visual acuity of budgerigars for moving targets |
| title_full_unstemmed |
Visual acuity of budgerigars for moving targets |
| title_sort |
visual acuity of budgerigars for moving targets |
| publisher |
The Company of Biologists |
| publishDate |
2021 |
| url |
https://doaj.org/article/71d4ae215e074b219a8dc8ff3ec7dfa8 |
| work_keys_str_mv |
AT sandrachaib visualacuityofbudgerigarsformovingtargets AT julianegaviraghimussoi visualacuityofbudgerigarsformovingtargets AT ollelind visualacuityofbudgerigarsformovingtargets AT almutkelber visualacuityofbudgerigarsformovingtargets |
| _version_ |
1718407838236147712 |