期刊
BIOLOGY OPEN
卷 10, 期 9, 页码 -出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/bio.058796
关键词
Bird vision; Visual resolution; Dynamic acuity; Target detection; Object detection
类别
资金
- Swedish Research Council [2016-03298_3]
- Swedish Research Council [2016-03298] Funding Source: Swedish Research Council
The study found that the target acuity of budgerigars for moving single targets is lower than their acuity for gratings, similar to their acuity for stationary single objects.
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.
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