Activity and sleep in dolphins

Gnone, G.; Moriconi, Tiziana; Gambini, Giorgia

doi:10.1038/nature04899

Cited by 26 publications

(20 citation statements)

References 4 publications

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“…However, based on 2 additional recent studies that assessed eye closure under water [127,128], it seems likely that young cetaceans engage in unihemispheric sleep while swimming, and do so from birth for many hours a day. It has been argued [7] that even if present, this unihemispheric sleep could not be restorative, because it is interrupted every 30–60 s by breathing.…”

Section: Corollary 1: Are There Animals That Do Not Sleep?mentioning

confidence: 99%

Is Sleep Essential?

Cirelli¹,

Tononi²

2008

PLoS Biol

539

419

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Section: Corollary 1: Are There Animals That Do Not Sleep?mentioning

confidence: 99%

Is Sleep Essential?

Cirelli¹,

Tononi²

2008

PLoS Biol

539

419

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“…The authors hypothesize that constant activity could be advantageous to newborns both to avoid predation and to maintain body temperature while development ensues (Lyamin et al 2005). This research was soon followed by two additional studies reaching the opposite conclusion (Gnone et al 2006;Sekiguchi et al 2006). Dolphins exhibit unihemispheric sleep, where slow-wave electroencephalogram (EEG) patterns restricted to a single hemisphere are linked to closure of the contralateral eye (Mukhametov 1987;Lyamin et al 2002Lyamin et al , 2004.…”

Section: The Dolphin Dilemmamentioning

confidence: 99%

Sleep and Development in Genetically Tractable Model Organisms

Kayser

Biron

2016

Genetics

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Sleep is widely recognized as essential, but without a clear singular function. Inadequate sleep impairs cognition, metabolism, immune function, and many other processes. Work in genetic model systems has greatly expanded our understanding of basic sleep neurobiology as well as introduced new concepts for why we sleep. Among these is an idea with its roots in human work nearly 50 years old: sleep in early life is crucial for normal brain maturation. Nearly all known species that sleep do so more while immature, and this increased sleep coincides with a period of exuberant synaptogenesis and massive neural circuit remodeling. Adequate sleep also appears critical for normal neurodevelopmental progression. This article describes recent findings regarding molecular and circuit mechanisms of sleep, with a focus on development and the insights garnered from models amenable to detailed genetic analyses.

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“…44 Although these studies do not show electrophysiological evidence of sleep, some authors posit that unihemispheric sleep is likely 45,46 and that migratory birds must somehow sleep in flight. 44 Given our findings, subcortical structures of the brain could be in SWS, TR, or REM sleep while overt behavior indicates wakefulness.…”

Section: Broader Implications Of the Findingsmentioning

confidence: 99%

Different Simultaneous Sleep States in the Hippocampus and Neocortex

Emrick

Gross

Riley

et al. 2016

Sleep

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Study Objectives: Investigators assign sleep-waking states using brain activity collected from a single site, with the assumption that states occur at the same time throughout the brain. We sought to determine if sleep-waking states differ between two separate structures: the hippocampus and neocortex. Methods: We measured electrical signals (electroencephalograms and electromyograms) during sleep from the hippocampus and neocortex of five freely behaving adult male rats. We assigned sleep-waking states in 10-sec epochs based on standard scoring criteria across a 4-h recording, then analyzed and compared states and signals from simultaneous epochs between sites. Results: We found that the total amount of each state, assigned independently using the hippocampal and neocortical signals, was similar between the hippocampus and neocortex. However, states at simultaneous epochs were different as often as they were the same (P = 0.82). Furthermore, we found that the progression of states often flowed through asynchronous state-pairs led by the hippocampus. For example, the hippocampus progressed from transitionto-rapid eye movement sleep to rapid eye movement sleep before the neocortex more often than in synchrony with the neocortex (38.7 ± 16.2% versus 15.8 ± 5.6% mean ± standard error of the mean). Conclusions: We demonstrate that hippocampal and neocortical sleep-waking states often differ in the same epoch. Consequently, electrode location affects estimates of sleep architecture, state transition timing, and perhaps even percentage of time in sleep states. Therefore, under normal conditions, models assuming brain state homogeneity should not be applied to the sleeping or waking brain.

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Activity and sleep in dolphins

Cited by 26 publications

References 4 publications

Is Sleep Essential?

Is Sleep Essential?

Sleep and Development in Genetically Tractable Model Organisms

Different Simultaneous Sleep States in the Hippocampus and Neocortex

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