Supplementary material from "Physiological state matching in a pair bonded poison frog"
Posted on 2024-06-27 - 14:17
More than a century ago, Charles Darwin hypothesized that the empathy-like phenotype is a phylogenetically widespread phenomenon. This idea remains contentious, due to the challenges of empirically examining emotions, and few investigations among non-mammalian vertebrates. We provide support for Darwin's hypothesis by discovering partial evidence for the most ancestral form of empathy, emotional contagion (i.e. matching another individual's emotional state), in the pair bonding mimetic poison frog, Ranitomeya imitator. We found that male corticosterone, a physiological biomarker of stress, positively correlates with female partners in experimental and semi-natural conditions. This does not appear to coincide with behavioural state-matching. However, it is specific to female partners relative to familiar female non-partners, and is independent of effects that commonly confound studies on emotional contagion. Furthermore, this physiological state-matching is irrespective of partnership longevity or lifetime reproductive output. These results physiologically indicate socially selective emotional contagion in a monogamous amphibian, and paradigms that elicit coinciding neural and behavioural indicators and morphogenic co-variation are needed for further corroboration. Further studies on ancestral forms of empathy in non-mammalian vertebrates are warranted.
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Nowicki, Jessica P.; Rodríguez, Camilo; Lee, Julia C.; Goolsby, Billie C.; Yang, Chen; Cleland, Thomas A.; et al. (2024). Supplementary material from "Physiological state matching in a pair bonded poison frog". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.7305356.v1