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Eleőd H, Gácsi M, Bunford N, Kis A. Event-related potentials indicate differential neural reactivity to species and valence information in vocal stimuli in sleeping dogs. Sci Rep 2023; 13:14518. [PMID: 37666838 PMCID: PMC10477275 DOI: 10.1038/s41598-023-40851-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 08/16/2023] [Indexed: 09/06/2023] Open
Abstract
Dogs live in a complex social environment where they regularly interact with conspecific and heterospecific partners. Awake dogs are able to process a variety of information based on vocalisations emitted by dogs and humans. Whether dogs are also able to process such information while asleep, is unknown. In the current explorative study, we investigated in N = 13 family dogs, neural response to conspecific and human emotional vocalisations. Data were recorded while dogs were asleep, using a fully non-invasive event-related potential (ERP) paradigm. A species (between 250-450 and 600-800 ms after stimulus onset) and a species by valence interaction (between 550 to 650 ms after stimulus onset) effect was observed during drowsiness. A valence (750-850 ms after stimulus onset) and a species x valence interaction (between 200 to 300 ms and 450 to 650 ms after stimulus onset) effect was also observed during non-REM specific at the Cz electrode. Although further research is needed, these results not only suggest that dogs neurally differentiate between differently valenced con- and heterospecific vocalisations, but they also provide the first evidence of complex vocal processing during sleep in dogs. Assessment and detection of ERPs during sleep in dogs appear feasible.
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Affiliation(s)
- Huba Eleőd
- Department of Ethology, ELTE Eötvös Loránd University, Budapest, Hungary.
- Doctoral School of Biology, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary.
| | - Márta Gácsi
- Department of Ethology, ELTE Eötvös Loránd University, Budapest, Hungary
- ELKH-ELTE Comparative Ethology Research Group, Budapest, Hungary
| | - Nóra Bunford
- ELKH-ELTE Comparative Ethology Research Group, Budapest, Hungary
- Research Centre for Natural Sciences, Institute of Cognitive Neuroscience and Psychology, Clinical and Developmental Neuropsychology Research Group, Budapest, Hungary
| | - Anna Kis
- Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Budapest, Hungary, Budapest, Hungary
- ELTE-ELKH NAP Comparative Ethology Research group, Budapest, Hungary
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Carreiro C, Reicher V, Kis A, Gácsi M. Owner-rated hyperactivity/impulsivity is associated with sleep efficiency in family dogs: a non-invasive EEG study. Sci Rep 2023; 13:1291. [PMID: 36690703 PMCID: PMC9870861 DOI: 10.1038/s41598-023-28263-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 01/16/2023] [Indexed: 01/25/2023] Open
Abstract
Subjective sleep disturbances are reported by humans with attention-deficit/hyperactivity disorder (ADHD). However, no consistent objective findings related to sleep disturbances led to the removal of sleep problems from ADHD diagnostic criteria. Dogs have been used as a model for human ADHD with questionnaires validated for this purpose. Also, their sleep physiology can be measured by non-invasive methods similarly to humans. In the current study, we recorded spontaneous sleep EEG in family dogs during a laboratory session. We analyzed the association of sleep macrostructure and deep sleep (NREM) slow-wave activity (SWA) with a validated owner-rated ADHD questionnaire, assessing inattention (IA), hyperactivity/impulsivity (H/I) and total (T) scores. Higher H/I and T were associated with lower sleep efficiency and longer time awake after initial drowsiness and NREM. IA showed no associations with sleep variables. Further, no association was found between ADHD scores and SWA. Our results are in line with human studies in which poor sleep quality reported by ADHD subjects is associated with some objective EEG macrostructural parameters. This suggests that natural variation in dogs' H/I is useful to gain a deeper insight of ADHD neural mechanisms.
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Affiliation(s)
- Cecília Carreiro
- Doctoral School of Biology, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary.
- Department of Ethology, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary.
| | - Vivien Reicher
- Doctoral School of Biology, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- MTA-ELTE Comparative Ethology Research Group, Budapest, Hungary
| | - Anna Kis
- Department of Ethology, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Márta Gácsi
- Department of Ethology, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- MTA-ELTE Comparative Ethology Research Group, Budapest, Hungary
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Mondino A, Catanzariti M, Mateos DM, Khan M, Ludwig C, Kis A, Gruen ME, Olby NJ. Sleep and cognition in aging dogs. A polysomnographic study. Front Vet Sci 2023; 10:1151266. [PMID: 37187924 PMCID: PMC10175583 DOI: 10.3389/fvets.2023.1151266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 03/17/2023] [Indexed: 05/17/2023] Open
Abstract
Introduction Sleep is fundamental for cognitive homeostasis, especially in senior populations since clearance of amyloid beta (key in the pathophysiology of Alzheimer's disease) occurs during sleep. Some electroencephalographic characteristics of sleep and wakefulness have been considered a hallmark of dementia. Owners of dogs with canine cognitive dysfunction syndrome (a canine analog to Alzheimer's disease) report that their dogs suffer from difficulty sleeping. The aim of this study was to quantify age-related changes in the sleep-wakefulness cycle macrostructure and electroencephalographic features in senior dogs and to correlate them with their cognitive performance. Methods We performed polysomnographic recordings in 28 senior dogs during a 2 h afternoon nap. Percentage of time spent in wakefulness, drowsiness, NREM, and REM sleep, as well as latency to the three sleep states were calculated. Spectral power, coherence, and Lempel Ziv Complexity of the brain oscillations were estimated. Finally, cognitive performance was evaluated by means of the Canine Dementia Scale Questionnaire and a battery of cognitive tests. Correlations between age, cognitive performance and sleep-wakefulness cycle macrostructure and electroencephalographic features were calculated. Results Dogs with higher dementia scores and with worse performance in a problem-solving task spent less time in NREM and REM sleep. Additionally, quantitative electroencephalographic analyses showed differences in dogs associated with age or cognitive performance, some of them reflecting shallower sleep in more affected dogs. Discussion Polysomnographic recordings in dogs can detect sleep-wakefulness cycle changes associated with dementia. Further studies should evaluate polysomnography's potential clinical use to monitor the progression of canine cognitive dysfunction syndrome.
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Affiliation(s)
- Alejandra Mondino
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, United States
| | - Magaly Catanzariti
- Instituto de Matemática Aplicada del Litoral, Consejo Nacional de Investigaciones Científicas y Técninas, Universidad Nacional del Litoral, Santa Fe, Argentina
| | - Diego Martin Mateos
- Instituto de Matemática Aplicada del Litoral, Consejo Nacional de Investigaciones Científicas y Técninas, Universidad Nacional del Litoral, Santa Fe, Argentina
- Physics Department, Universidad Autónoma de Entre Ríos (UADER), Oro Verde, Entre Ríos, Argentina
| | - Michael Khan
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, United States
| | - Claire Ludwig
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, United States
| | - Anna Kis
- Research Centre for Natural Sciences, Institute of Cognitive Neuroscience and Psychology, Budapest, Hungary
| | - Margaret E. Gruen
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, United States
| | - Natasha J. Olby
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, United States
- *Correspondence: Natasha J. Olby
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Bálint A, Eleőd H, Magyari L, Kis A, Gácsi M. Differences in dogs' event-related potentials in response to human and dog vocal stimuli; a non-invasive study. ROYAL SOCIETY OPEN SCIENCE 2022; 9:211769. [PMID: 35401994 PMCID: PMC8984299 DOI: 10.1098/rsos.211769] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 01/31/2022] [Indexed: 05/03/2023]
Abstract
Recent advances in the field of canine neuro-cognition allow for the non-invasive research of brain mechanisms in family dogs. Considering the striking similarities between dog's and human (infant)'s socio-cognition at the behavioural level, both similarities and differences in neural background can be of particular relevance. The current study investigates brain responses of n = 17 family dogs to human and conspecific emotional vocalizations using a fully non-invasive event-related potential (ERP) paradigm. We found that similarly to humans, dogs show a differential ERP response depending on the species of the caller, demonstrated by a more positive ERP response to human vocalizations compared to dog vocalizations in a time window between 250 and 650 ms after stimulus onset. A later time window between 800 and 900 ms also revealed a valence-sensitive ERP response in interaction with the species of the caller. Our results are, to our knowledge, the first ERP evidence to show the species sensitivity of vocal neural processing in dogs along with indications of valence sensitive processes in later post-stimulus time periods.
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Affiliation(s)
- Anna Bálint
- MTA-ELTE Comparative Ethology Research Group, Budapest, Hungary
- Department of Ethology, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Huba Eleőd
- Department of Ethology, ELTE Eötvös Loránd University, Budapest, Hungary
- Doctoral School of Biology, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Lilla Magyari
- MTA-ELTE ‘Lendület’ Neuroethology of Communication Research Group, Hungarian Academy of Sciences, ELTE Eötvös Loránd University, Budapest, Hungary
- Department of Social Studies, University of Stavanger, Stavanger, Norway
| | - Anna Kis
- Department of Ethology, ELTE Eötvös Loránd University, Budapest, Hungary
- Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences,Budapest, Hungary
| | - Márta Gácsi
- MTA-ELTE Comparative Ethology Research Group, Budapest, Hungary
- Department of Ethology, ELTE Eötvös Loránd University, Budapest, Hungary
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Li M, Cui J, Xu B, Wei Y, Fu C, Lv X, Xiong L, Qin D. Sleep Disturbances and Depression Are Co-morbid Conditions: Insights From Animal Models, Especially Non-human Primate Model. Front Psychiatry 2021; 12:827541. [PMID: 35145441 PMCID: PMC8821160 DOI: 10.3389/fpsyt.2021.827541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 12/31/2021] [Indexed: 02/05/2023] Open
Abstract
The incidence rates of depression are increasing year by year. As one of the main clinical manifestations of depression, sleep disorder is often the first complication. This complication may increase the severity of depression and lead to poor prognosis in patients. In the past decades, there have been many methods used to evaluate sleep disorders, such as polysomnography and electroencephalogram, actigraphy, and videography. A large number of rodents and non-human primate models have reproduced the symptoms of depression, which also show sleep disorders. The purpose of this review is to examine and discuss the relationship between sleep disorders and depression. To this end, we evaluated the prevalence, clinical features, phenotypic analysis, and pathophysiological brain mechanisms of depression-related sleep disturbances. We also emphasized the current situation, significance, and insights from animal models of depression, which would provide a better understanding for the pathophysiological mechanisms between sleep disturbance and depression.
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Affiliation(s)
- Meng Li
- School of Basic Medical Sciences, Yunnan University of Chinese Medicine, Kunming, China
| | - Jieqiong Cui
- School of Basic Medical Sciences, Yunnan University of Chinese Medicine, Kunming, China
| | - Bonan Xu
- School of Basic Medical Sciences, Yunnan University of Chinese Medicine, Kunming, China
| | - Yuanyuan Wei
- School of Basic Medical Sciences, Yunnan University of Chinese Medicine, Kunming, China
| | - Chenyang Fu
- School of Basic Medical Sciences, Yunnan University of Chinese Medicine, Kunming, China
| | - Xiaoman Lv
- School of Basic Medical Sciences, Yunnan University of Chinese Medicine, Kunming, China
| | - Lei Xiong
- School of Basic Medical Sciences, Yunnan University of Chinese Medicine, Kunming, China
| | - Dongdong Qin
- School of Basic Medical Sciences, Yunnan University of Chinese Medicine, Kunming, China
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