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144Chapter 8AbstractInter-individual coordination (IIC) at the behavioral and physiological level,and its association with courtship and pair-bond maintenance, have been receiving increased attention in the scientific literature in recent years. However, there is no integrative framework combining the plethora of findings inhumans and nonhuman species yet that addresses the evolutionary originsof IIC. Here, we take a comparative approach and review findings on thelink between IIC and pair-bond formation, maintenance, and bi-parentalcare. Our review suggests that across socially monogamous species, IIC –at a behavioral and physiological level – is correlated with the likelihoodof forming and retaining a pair-bond, and with reproductive success. Weexpand on the pair-bonding hypothesis by stating that higher levels of IICmight be beneficial for relationship quality and bi-parental care and, as aresult, might also become a preferred trait in the formation and maintenance of a pair-bond. We further discuss the key questions to disentanglethe evolution of IIC based on this hypothesis.Based on:Samara, I., Roth, T. S., Tan, J., Prochazkova, E., & Kret, M. E.(2021). A comparative framework of inter-individual coordination andpair-bonding. Current Opinion in Behavioral Sciences, 39, 98-105.https://doi.org/10.1016/j.cobeha.2021.03.005AbstractInter-individual coordination (IIC) at the behavioral and physiological level,and its association with courtship and pair-bond maintenance, have been receiving increased attention in the scientific literature in recent years. However, there is no integrative framework combining the plethora of findings inhumans and nonhuman species yet that addresses the evolutionary originsof IIC. Here, we take a comparative approach and review findings on thelink between IIC and pair-bond formation, maintenance, and bi-parentalcare. Our review suggests that across socially monogamous species, IIC –at a behavioral and physiological level – is correlated with the likelihoodof forming and retaining a pair-bond, and with reproductive success. Weexpand on the pair-bonding hypothesis by stating that higher levels of IICmight be beneficial for relationship quality and bi-parental care and, as aresult, might also become a preferred trait in the formation and maintenance of a pair-bond. We further discuss the key questions to disentanglethe evolution of IIC based on this hypothesis.Based on:Samara, I., Roth, T. S., Tan, J., Prochazkova, E., & Kret, M. E.(2021). A comparative framework of inter-individual coordination andpair-bonding. Current Opinion in Behavioral Sciences, 39, 98-105.https://doi.org/10.1016/j.cobeha.2021.03.005Iliana Samara 17x24.indd 144 08-04-2024 16:36