期刊
JOURNAL OF NEUROSCIENCE
卷 33, 期 6, 页码 2555-2561出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.2603-12.2013
关键词
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资金
- National Institutes of Health [R01-NS069640]
- National Science Foundation [0919929]
- Medical Research Service of the Department of Veterans Affairs
- Utrish Dolphinarium
- National Science and Engineering Council of Canada
- Canadian Institutes of Health Research
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [0919929] Funding Source: National Science Foundation
On land, fur seals predominately display bilaterally synchronized electroencephalogram (EEG) activity during slow-wave sleep (SWS), similar to that observed in all terrestrial mammals. In water, however, fur seals exhibit asymmetric slow-wave sleep (ASWS), resembling the unihemispheric slow-wave sleep of odontocetes (toothed whales). The unique sleeping pattern of fur seals allows us to distinguish neuronal mechanisms mediating EEG changes from those mediating behavioral quiescence. In a prior study we found that cortical acetylcholine release is lateralized during ASWS in the northern fur seal, with greater release in the hemisphere displaying low-voltage (waking) EEG activity, linking acetylcholine release to hemispheric EEG activation (Lapierre et al. 2007). In contrast to acetylcholine, we now report that cortical serotonin release is not lateralized during ASWS. Our data demonstrate that bilaterally symmetric levels of serotonin are compatible with interhemispheric EEG asymmetry in the fur seal. We also find greatly elevated levels during eating and hosing the animals with water, suggesting that serotonin is more closely linked to bilateral variables, such as axial motor and autonomic control, than to the lateralized cortical activation manifested in asymmetrical sleep.
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