Research reportUnihemispheric slow wave sleep and the state of the eyes in a white whale
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Acknowledgements
The study was supported by Utrish Dolphinarium Ltd. and the Medical Research Service of the Veterans Administration, USPHS grant NS32819. The authors thank E. Rozanova for veterinary support and two anonymous reviewers whose comments improved the final version of the manuscript.
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2019, Handbook of Behavioral NeuroscienceCitation Excerpt :The remaining time was occupied by episodes of both hemispheres displaying either (1) different forms of EEG synchronization (high-voltage EEG of maximal amplitude in one hemisphere and low-voltage EEG in the other) or (2) low-voltage EEG in both hemispheres; these states represent asymmetrical SWS (ASWS, 4%–15% of the total SWS time in different animals) or low-voltage bilateral SWS (BSWS, 7%–22%), respectively. High-voltage BSWS was never recorded in studied cetaceans under normal conditions (Lyamin, Manger, et al., 2008; Mukhametov, 1987; Mukhametov et al., 1997; Mukhametov & Polyakova, 1981), except for instances of several seconds of BSWS in a beluga (< 0.2% of TST; Lyamin, Mukhametov, Siegel, et al., 2002). In bottlenose dolphins, uninterrupted episodes of USWS lasted 4–132 min (on average 42 + 2 min), and the number of episodes ranged between 2 and 12 per day (5 + 1; Mukhametov et al., 1997, Lyamin, Mukhametov, & Siegel, 2004).
Silent porpoise: potential sleeping behaviour identified in wild harbour porpoises
2017, Animal Behaviour