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Stimulus motion improves spatial contrast sensitivity in budgerigars (Melopsittacus undulatus).

Haller, Nicola LU ; Lind, Olle LU ; Steinlechner, Stephan and Kelber, Almut LU (2014) In Vision Research 102. p.19-25
Abstract
Birds are generally thought to have excellent vision with high spatial resolution. However, spatial contrast sensitivity of birds for stationary targets is low compared to other animals with similar acuity, such as mammals. For fast flying animals body stability and coordination are highly important, and visual motion cues are known to be relevant for flight control. We have tested five budgerigars (Melopsittacus undulatus) in behavioural discrimination experiments to determine whether or not stimulus motion improves contrast sensitivity. The birds were trained to distinguish between a homogenous grey field and sine-wave gratings of spatial frequencies between 0.48 and 6.5 cycles/degree, and Michelson contrasts between 0.7% and 99%. The... (More)
Birds are generally thought to have excellent vision with high spatial resolution. However, spatial contrast sensitivity of birds for stationary targets is low compared to other animals with similar acuity, such as mammals. For fast flying animals body stability and coordination are highly important, and visual motion cues are known to be relevant for flight control. We have tested five budgerigars (Melopsittacus undulatus) in behavioural discrimination experiments to determine whether or not stimulus motion improves contrast sensitivity. The birds were trained to distinguish between a homogenous grey field and sine-wave gratings of spatial frequencies between 0.48 and 6.5 cycles/degree, and Michelson contrasts between 0.7% and 99%. The gratings were either stationary or drifting with velocities between 0.9 and 13 degrees/s. Budgerigars were able to discriminate patterns of lower contrast from grey when the gratings were drifting, and the improvement in sensitivity was strongest at lower spatial frequencies and higher drift velocities. Our findings indicate that motion cues can have positive effects on visual perception of birds. This is similar to earlier results on human vision. Contrast sensitivity, tested solely with stationary stimuli, underestimates the sensory capacity of budgerigars flying through their natural environments. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bird vision Budgerigar Spatial contrast sensitivity Motion vision Motion perception
in
Vision Research
volume
102
pages
19 - 25
publisher
Elsevier
external identifiers
  • pmid:25072853
  • wos:000341338900003
  • scopus:84905670302
ISSN
1878-5646
DOI
10.1016/j.visres.2014.07.007
language
English
LU publication?
yes
id
5a0b9956-1e2d-4dab-9868-61846caa87b0 (old id 4581036)
date added to LUP
2014-09-09 15:49:39
date last changed
2017-10-01 03:03:59
@article{5a0b9956-1e2d-4dab-9868-61846caa87b0,
  abstract     = {Birds are generally thought to have excellent vision with high spatial resolution. However, spatial contrast sensitivity of birds for stationary targets is low compared to other animals with similar acuity, such as mammals. For fast flying animals body stability and coordination are highly important, and visual motion cues are known to be relevant for flight control. We have tested five budgerigars (Melopsittacus undulatus) in behavioural discrimination experiments to determine whether or not stimulus motion improves contrast sensitivity. The birds were trained to distinguish between a homogenous grey field and sine-wave gratings of spatial frequencies between 0.48 and 6.5 cycles/degree, and Michelson contrasts between 0.7% and 99%. The gratings were either stationary or drifting with velocities between 0.9 and 13 degrees/s. Budgerigars were able to discriminate patterns of lower contrast from grey when the gratings were drifting, and the improvement in sensitivity was strongest at lower spatial frequencies and higher drift velocities. Our findings indicate that motion cues can have positive effects on visual perception of birds. This is similar to earlier results on human vision. Contrast sensitivity, tested solely with stationary stimuli, underestimates the sensory capacity of budgerigars flying through their natural environments.},
  author       = {Haller, Nicola and Lind, Olle and Steinlechner, Stephan and Kelber, Almut},
  issn         = {1878-5646},
  keyword      = {Bird vision Budgerigar Spatial contrast sensitivity Motion vision Motion perception},
  language     = {eng},
  pages        = {19--25},
  publisher    = {Elsevier},
  series       = {Vision Research},
  title        = {Stimulus motion improves spatial contrast sensitivity in budgerigars (Melopsittacus undulatus).},
  url          = {http://dx.doi.org/10.1016/j.visres.2014.07.007},
  volume       = {102},
  year         = {2014},
}