Unihemispheric slow wave sleep and the state of the eyes in a white whale
We recorded electroencephalogram (EEG) and simultaneously documented the state of both eyelids during sleep and wakefulness in a sub-adult male white whale over a 4-day-period. We showed that the white whale was the fifth species of Cetaceans, which exhibits unihemispheric slow wave sleep. We found...
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ftpubmed:oai:pubmedcentral.nih.gov:8788623 2023-05-15T18:44:02+02:00 Unihemispheric slow wave sleep and the state of the eyes in a white whale Lyamin, O.I. Mukhametov, L.M. Siegel, J.M. Nazarenko, E.A. Polyakova, I.G. Shpak, O.V. 2002-02-01 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8788623/ http://www.ncbi.nlm.nih.gov/pubmed/11809503 https://doi.org/10.1016/s0166-4328(01)00346-1 en eng http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8788623/ http://www.ncbi.nlm.nih.gov/pubmed/11809503 http://dx.doi.org/10.1016/s0166-4328(01)00346-1 Behav Brain Res Article Text 2002 ftpubmed https://doi.org/10.1016/s0166-4328(01)00346-1 2022-01-30T01:41:54Z We recorded electroencephalogram (EEG) and simultaneously documented the state of both eyelids during sleep and wakefulness in a sub-adult male white whale over a 4-day-period. We showed that the white whale was the fifth species of Cetaceans, which exhibits unihemispheric slow wave sleep. We found that the eye contralateral to the sleeping hemisphere in this whale was usually closed (right eye, 52% of the total sleep time in the contralateral hemisphere; left eye, 40%) or in an intermediate state (31 and 46%, respectively) while the ipsilateral eye was typically open (89 and 80%). Episodes of bilateral eye closure in this whale occupied less than 2% of the observation time and were usually recorded during waking (49% of the bilateral eye closure time) or low amplitude sleep (48%) and rarely in high amplitude sleep (3%). In spite of the evident overall relationship between the sleeping hemisphere and eye state, EEG and eye position in this whale could be independent over short time periods (less than 1 min). Therefore, eye state alone may not accurately reflect sleep state in Cetaceans. Our data support the idea that unihemispheric sleep allows Cetaceans to monitor the environment. Text White whale PubMed Central (PMC) Behavioural Brain Research 129 1-2 125 129 |
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Article Lyamin, O.I. Mukhametov, L.M. Siegel, J.M. Nazarenko, E.A. Polyakova, I.G. Shpak, O.V. Unihemispheric slow wave sleep and the state of the eyes in a white whale |
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We recorded electroencephalogram (EEG) and simultaneously documented the state of both eyelids during sleep and wakefulness in a sub-adult male white whale over a 4-day-period. We showed that the white whale was the fifth species of Cetaceans, which exhibits unihemispheric slow wave sleep. We found that the eye contralateral to the sleeping hemisphere in this whale was usually closed (right eye, 52% of the total sleep time in the contralateral hemisphere; left eye, 40%) or in an intermediate state (31 and 46%, respectively) while the ipsilateral eye was typically open (89 and 80%). Episodes of bilateral eye closure in this whale occupied less than 2% of the observation time and were usually recorded during waking (49% of the bilateral eye closure time) or low amplitude sleep (48%) and rarely in high amplitude sleep (3%). In spite of the evident overall relationship between the sleeping hemisphere and eye state, EEG and eye position in this whale could be independent over short time periods (less than 1 min). Therefore, eye state alone may not accurately reflect sleep state in Cetaceans. Our data support the idea that unihemispheric sleep allows Cetaceans to monitor the environment. |
format |
Text |
author |
Lyamin, O.I. Mukhametov, L.M. Siegel, J.M. Nazarenko, E.A. Polyakova, I.G. Shpak, O.V. |
author_facet |
Lyamin, O.I. Mukhametov, L.M. Siegel, J.M. Nazarenko, E.A. Polyakova, I.G. Shpak, O.V. |
author_sort |
Lyamin, O.I. |
title |
Unihemispheric slow wave sleep and the state of the eyes in a white whale |
title_short |
Unihemispheric slow wave sleep and the state of the eyes in a white whale |
title_full |
Unihemispheric slow wave sleep and the state of the eyes in a white whale |
title_fullStr |
Unihemispheric slow wave sleep and the state of the eyes in a white whale |
title_full_unstemmed |
Unihemispheric slow wave sleep and the state of the eyes in a white whale |
title_sort |
unihemispheric slow wave sleep and the state of the eyes in a white whale |
publishDate |
2002 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8788623/ http://www.ncbi.nlm.nih.gov/pubmed/11809503 https://doi.org/10.1016/s0166-4328(01)00346-1 |
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White whale |
genre_facet |
White whale |
op_source |
Behav Brain Res |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8788623/ http://www.ncbi.nlm.nih.gov/pubmed/11809503 http://dx.doi.org/10.1016/s0166-4328(01)00346-1 |
op_doi |
https://doi.org/10.1016/s0166-4328(01)00346-1 |
container_title |
Behavioural Brain Research |
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129 |
container_issue |
1-2 |
container_start_page |
125 |
op_container_end_page |
129 |
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1766234605915996160 |