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Reicher V, Kis A, Simor P, Bódizs R, Gácsi M. Interhemispheric asymmetry during NREM sleep in the dog. Sci Rep 2021; 11:18817. [PMID: 34552141 PMCID: PMC8458274 DOI: 10.1038/s41598-021-98178-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 08/12/2021] [Indexed: 02/08/2023] Open
Abstract
Functional hemispheric asymmetry was evidenced in many species during sleep. Dogs seem to show hemispheric asymmetry during wakefulness; however, their asymmetric neural activity during sleep was not yet explored. The present study investigated interhemispheric asymmetry in family dogs using non-invasive polysomnography. EEG recordings during 3-h-long afternoon naps were carried out (N = 19) on two occasions at the same location. Hemispheric asymmetry was assessed during NREM sleep, using bilateral EEG channels. To include periods with high homeostatic sleep pressure and to reduce the variance of the time spent in NREM sleep between dogs, the first two sleep cycles were analysed. Left hemispheric predominance of slow frequency range was detected in the first sleep cycle of sleep recording 1, compared to the baseline level of zero asymmetry as well as to the first sleep cycle of sleep recording 2. Regarding the strength of hemispheric asymmetry, we found greater absolute hemispheric asymmetry in the second sleep cycle of sleep recording 1 and 2 in the frequency ranges of alpha, sigma and beta, compared to the first sleep cycle. Differences between sleep recordings and consecutive sleep cycles might be indicative of adaptation-like processes, but do not closely resemble the results described in humans.
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Affiliation(s)
- Vivien Reicher
- Department of Ethology, Institute of Biology, Eötvös Loránd University, Budapest, Hungary.
- MTA-ELTE Comparative Ethology Research Group, Budapest, Hungary.
| | - Anna Kis
- Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Péter Simor
- Institute of Psychology, Eötvös Loránd University, Budapest, Hungary
| | - Róbert Bódizs
- Institute of Behavioural Sciences, Semmelweis University, Budapest, Hungary
- National Institute of Clinical Neurosciences, Budapest, Hungary
| | - Márta Gácsi
- Department of Ethology, Institute of Biology, Eötvös Loránd University, Budapest, Hungary
- MTA-ELTE Comparative Ethology Research Group, Budapest, Hungary
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Bódizs R, Gombos F, Ujma PP, Szakadát S, Sándor P, Simor P, Pótári A, Konrad BN, Genzel L, Steiger A, Dresler M, Kovács I. The hemispheric lateralization of sleep spindles in humans. ACTA ACUST UNITED AC 2017. [DOI: 10.1556/2053.01.2017.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Róbert Bódizs
- Institute of Behavioural Sciences, Semmelweis University, Budapest, Hungary
- Department of General Psychology, Pázmány Péter Catholic University, Budapest, Hungary
- National Institute of Clinical Neurosciences, Budapest, Hungary
| | - Ferenc Gombos
- Department of General Psychology, Pázmány Péter Catholic University, Budapest, Hungary
| | - Péter P. Ujma
- Institute of Behavioural Sciences, Semmelweis University, Budapest, Hungary
- National Institute of Clinical Neurosciences, Budapest, Hungary
| | - Sára Szakadát
- Institute of Behavioural Sciences, Semmelweis University, Budapest, Hungary
| | - Piroska Sándor
- Institute of Behavioural Sciences, Semmelweis University, Budapest, Hungary
| | - Péter Simor
- Department of Cognitive Science, Budapest University of Technology and Economics, Budapest, Hungary
- Nyírő Gyula Hospital, National Institute of Psychiatry and Addictions, Budapest, Hungary
| | - Adrián Pótári
- Department of Cognitive Science, Budapest University of Technology and Economics, Budapest, Hungary
| | | | - Lisa Genzel
- Centre for Cognitive and Neural Systems, University of Edinburgh, Edinburgh, United Kingdom
| | - Axel Steiger
- Max Planck Institute of Psychiatry, Munich, Germany
| | - Martin Dresler
- Donders Institute for Brain, Cognition and Behaviour, Nijmegen, The Netherlands
- Max Planck Institute of Psychiatry, Munich, Germany
| | - Ilona Kovács
- Department of General Psychology, Pázmány Péter Catholic University, Budapest, Hungary
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