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Still-face effect in domestic dogs: comparing untrained with trained and animal assisted interventions dogs

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Abstract

The still-face effect has been extensively studied in human infants and comprises the reduction in affiliative behaviors and increased stress that occurs after a sudden interruption of social interaction with a caregiver. Domestic dogs (Canis familiaris) are model candidates for showing this effect, as they form deep bonds with their owners and interspecific social interaction is reinforcing to them. The aim of these studies was to assess if companion dogs exhibit the still-face effect and whether prior experiences during ontogeny modulate this effect. To this end, Study 1 compared dogs with different levels of training (untrained, intermediate, and advanced), while Study 2 assessed dogs that participated in Animal Assisted Interventions (AAIs) and companion dogs (CDs). The procedure was carried out virtually and comprised three phases lasting 1 min: interaction, still-face (the owner turned suddenly indifferent), and reunion (the interaction was resumed). Dogs exhibited a decrease in proximity to and contact with the owner, as well as an increase in begging and stress behaviors during the still-face phase. Moreover, this was not observed in a control condition in which the interaction continued in the same way during all three phases, discarding alternative explanations for these changes. These results show that dogs experience a still-face effect in a similar way to infants, highlighting the value interspecific social interaction has for dogs. Nevertheless, the absence of differences according to their training level or participation in AAIs suggests this is a robust phenomenon, which appears to be less susceptible to the influences of ontogenetic experiences.

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All data generated or analyzed during this study are included in this published article.

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Funding

This research was supported by grants from the National Scientific and Technical Research Council (CONICET) (PIP N° 11220130100182) and the National Agency for the Promotion of Science and Technology of Argentina (ANPCYT) (PICT 2018, N° 1581).

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Conceptualization: Gabriela Barrera, Mariana Bentosela. Methodology: Gabriela Barrera, Mariana Bentosela, Camila Cavalli. Data collection and formal analysis: Mariana Bentosela, Camila Cavalli, Marina Victoria Dzik. Writing – original draft preparation: Mariana Bentosela, Camila Cavalli. Writing – review and editing: Gabriela Barrera, Mariana Bentosela, Camila Cavalli, Marina Victoria Dzik. Supervision and funding acquisition: Mariana Bentosela.

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Correspondence to M. Bentosela.

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Ethics approval

These studies comply with the current Argentinean law of animal protection (Law 14.346) and all procedures were in accordance with the ethical standards and the approval of the CICUAL (Institutional Commission for the Care and Use of Laboratory Animals) from the Medical Research Institute IDIM CONICET (Res. N° 120-20 R1, 120-20 R1A). All owners gave their written consent for participation in these studies.

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The authors declare that they have no conflict of interests.

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Cavalli, C., Dzik, M.V., Barrera, G. et al. Still-face effect in domestic dogs: comparing untrained with trained and animal assisted interventions dogs. Learn Behav 51, 428–445 (2023). https://doi.org/10.3758/s13420-023-00589-x

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  • DOI: https://doi.org/10.3758/s13420-023-00589-x

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