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Sleep macrostructure is modulated by positive and negative social experience in adult pet dogs.

ABSTRACT: The effects of emotionally valenced events on sleep physiology are well studied in humans and laboratory rodents. However, little is known about these effects in other species, despite the fact that several sleep characteristics differ across species and thus limit the generalizability of such findings. Here we studied the effect of positive and negative social experiences on sleep macrostructure in dogs, a species proven to be a good model of human social cognition. A non-invasive polysomnography method was used to collect data from pet dogs (n = 16) participating in 3-hour-long sleep occasions. Before sleep, dogs were exposed to emotionally positive or negative social interactions (PSI or NSI) in a within-subject design. PSI consisted of petting and ball play, while NSI was a mixture of separation, threatening approach and still face test. Sleep macrostructure was markedly different between pre-treatment conditions, with a shorter sleep latency after NSI and a redistribution of the time spent in the different sleep stages. Dogs' behaviour during pre-treatments was related to the macrostructural difference between the two occasions, and was further modulated by individual variability in personality. This result provides the first direct evidence that emotional stimuli affect subsequent sleep physiology in dogs.

SUBMITTER: Kis A

PROVIDER: S-EPMC5666109 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature

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Sleep macrostructure is modulated by positive and negative social experience in adult pet dogs.

Kis Anna A Gergely Anna A Galambos Ágoston Á Abdai Judit J Gombos Ferenc F Bódizs Róbert R Topál József J

Proceedings. Biological sciences 20171001 1865

The effects of emotionally valenced events on sleep physiology are well studied in humans and laboratory rodents. However, little is known about these effects in other species, despite the fact that several sleep characteristics differ across species and thus limit the generalizability of such findings. Here we studied the effect of positive and negative social experiences on sleep macrostructure in dogs, a species proven to be a good model of human social cognition. A non-invasive polysomnograp ...[more]

PMID: 29070727

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Project description:Oxytocin is a key modulator of emotional processing and social cognitive function. In line with this, polymorphisms of genes involved in oxytocin signaling, like the oxytocin receptor (OXTR) gene, are known to influence social behavior in various species. However, to date, no study has investigated environmental factors possibly influencing the epigenetic variation of the OXTR gene and its behavioral effects in dogs. Pet dogs form individualized and strong relationships with their owners who are central figures in the social environment of their dogs and therefore might influence the methylation levels of their OXTR gene. Here we set out to investigate whether DNA methylation within the OXTR promoter region of pet dogs is linked to their owner's interaction style and to the social behavior of the dogs. To be able to do so, we collected buccal epithelial cells and, in Study 1, we used pyrosequencing techniques to look for differentially methylated CpG sites in the canine OXTR promoter region on a heterogeneous sample of dogs and wolves of different ages and keeping conditions. Four identified sites (at positions -727, -751, -1371, and -1383 from transcription start site) showing more than 10% methylation variation were then, in Study 2, measured in triplicate in 217 pet Border Collies previously tested for reactions to an adverse social situation (i.e., approach by a threatening human) and with available data on their owners' interaction styles. We found that CpG methylation was significantly associated with the behavior of the dogs, in particular with the likelihood that dogs would hide behind their owner or remain passive when approached by a threatening human. On the other hand, CpG methylation was not related to the owners' behavior but to dog sex (at position -1371). Our findings underpin the complex relationship between epigenetics and behavior and highlight the importance of including epigenetic methods in the analysis of dog behavioral development. Further research is needed to investigate which environmental factors influence the epigenetic variation of the OXTR gene.

Project description:BackgroundOnline assessment of narrative production and comprehension became an important component of language assessment during the COVID-19 pandemic. This study aimed to establish quantitative measures of narrative macrostructure in the production and comprehension of adult Irish-English bilinguals in an online assessment.MethodsA total of 30 Irish-English bilingual adults participated in an online assessment of oral narrative production and comprehension. Narratives were elicited using LITMUS-MAIN for Irish and English. Story-tell elicitation method was used for all stories. Twenty participants produced Baby Birds and Baby Goats story pairs while 10 participants produced Cat and Dog story pairs. Quantitative measures of story structure, comprehension score, and the overall number of Internal State Terms (ISTs) in production and comprehension were compared across the story pairs, languages, and the output type (production vs. comprehension).ResultsA general linear model indicated no differences in either story structure or story comprehension scores across languages for both sets of stories. Combined analysis for all participants and stories indicated no difference in the story structure scores or comprehension scores across the languages or the story pairs. While the overall number of ISTs was the same across languages, a higher number of ISTs was observed in comprehension relative to production in both languages for Cat and Dog story pair only, but not for Baby birds and Baby goats' stories. The major benefit of using online assessment was the accessibility of participants. The major drawback was the inability to control the environment and the quality of the internet connection.Conclusion and implicationsWhile online assessment increased the availability of participants, which is a significant factor in rural Ireland characterized by low population density and the high percentage of Irish speakers, the availability of stable internet connection limited the applicability of online assessment. Measures of narrative macrostructure were stable across the languages and the story pairs. This is important because of high variability in exposure to Irish, frequent code-switching, and a high number of morphosyntactic errors due to rapid language change that characterizes Irish-English bilinguals. Identifying reliable measures of language performance for Irish-English adult speakers is an important step toward establishing developmental norms for Irish-English bilinguals.

Dataset Information

Sleep macrostructure is modulated by positive and negative social experience in adult pet dogs.

Publications

Sleep macrostructure is modulated by positive and negative social experience in adult pet dogs.

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