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Circadian Regulation of Visually Evoked Potentials in the Domestic Pigeon, Columba livia

Wu, Wen-Qi; McGoogan, J M and Cassone, V M (2000) In Journal of Biological Rhythms 15(4). p.317-328
Abstract
The avian circadian and visual systems are integrally related and together influence many aspects of birds' behavior and physiology. Certainly, light cycles and their visual perception are the major zeitgebers for circadian rhythms, but do circadian rhythms affect vision? To assess whether visual func-tion is regulated on a circadian basis, flash-evoked electroretinograms (ERGs) and vision-evoked potentials (VEPs) from the optic tectum (TeO) were recorded simultaneously in domestic pigeons at different circadian phases in a light-dark regime (LD) and in constant darkness (DD), while feeding activity was measured to determine circadian phase. In both LD and DD, the amplitudes of ERG b-waves were higher during the day than at night and... (More)
The avian circadian and visual systems are integrally related and together influence many aspects of birds' behavior and physiology. Certainly, light cycles and their visual perception are the major zeitgebers for circadian rhythms, but do circadian rhythms affect vision? To assess whether visual func-tion is regulated on a circadian basis, flash-evoked electroretinograms (ERGs) and vision-evoked potentials (VEPs) from the optic tectum (TeO) were recorded simultaneously in domestic pigeons at different circadian phases in a light-dark regime (LD) and in constant darkness (DD), while feeding activity was measured to determine circadian phase. In both LD and DD, the amplitudes of ERG b-waves were higher during the day than at night and latencies of a- and b-waves were longer at night. The median effective intensity for ERGa-wave was margin-ally higher during the day than during the night, indicating greater sensitivity at night, but this rhythm did not persist in DD. The amplitudes of TeO VEPs were also greater during the day, and latencies were greater at night in LD and DD. Together, the data indicate that a circadian clock regulates pigeon visual function at several integrative levels. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Journal of Biological Rhythms
volume
15
issue
4
pages
317 - 328
publisher
SAGE Publications
ISSN
1552-4531
DOI
10.1177/074873000129001422
language
English
LU publication?
no
id
8422d79c-7ba4-493e-90a4-14a606de19f2 (old id 149638)
date added to LUP
2007-06-27 14:47:42
date last changed
2016-04-16 04:34:55
@article{8422d79c-7ba4-493e-90a4-14a606de19f2,
  abstract     = {The avian circadian and visual systems are integrally related and together influence many aspects of birds' behavior and physiology. Certainly, light cycles and their visual perception are the major zeitgebers for circadian rhythms, but do circadian rhythms affect vision? To assess whether visual func-tion is regulated on a circadian basis, flash-evoked electroretinograms (ERGs) and vision-evoked potentials (VEPs) from the optic tectum (TeO) were recorded simultaneously in domestic pigeons at different circadian phases in a light-dark regime (LD) and in constant darkness (DD), while feeding activity was measured to determine circadian phase. In both LD and DD, the amplitudes of ERG b-waves were higher during the day than at night and latencies of a- and b-waves were longer at night. The median effective intensity for ERGa-wave was margin-ally higher during the day than during the night, indicating greater sensitivity at night, but this rhythm did not persist in DD. The amplitudes of TeO VEPs were also greater during the day, and latencies were greater at night in LD and DD. Together, the data indicate that a circadian clock regulates pigeon visual function at several integrative levels.},
  author       = {Wu, Wen-Qi and McGoogan, J M and Cassone, V M},
  issn         = {1552-4531},
  language     = {eng},
  number       = {4},
  pages        = {317--328},
  publisher    = {SAGE Publications},
  series       = {Journal of Biological Rhythms},
  title        = {Circadian Regulation of Visually Evoked Potentials in the Domestic Pigeon, <i>Columba livia</i>},
  url          = {http://dx.doi.org/10.1177/074873000129001422},
  volume       = {15},
  year         = {2000},
}