Suicide attempts, self-harm and suicidal ideation among Norwegian university students with eating disorders and disordered eating: the SHoT study 2018 and 2022.

Interactions with conspecific individuals have substantial impacts on physical and mental well-being. Especially in early life, humans and animals acquire new skills, like vocal communication, by socially engaging with adult tutors. In turn, early life stress, such as parental neglect, can disrupt functional brain development leading to psychiatric illness. Both chronic stress in rodents and enduring depression in humans further dysregulate body temperature. Social synchrony in circadian or menstrual rhythmicity has been reported in humans, animals, and insects. While the involvement of sensory (olfactory) cues has been suggested, underlying mechanisms of social synchrony are still largely unknown. Recent studies using wireless devices further revealed that synchronized brain activity emerges within social dyads under semi-natural conditions. Together, these findings suggest that the impact of social life can be tracked by the longitudinal measurement of biophysical signals, such as body temperature. However, it has been challenging to pursue in a non-intrusive manner that does not disrupt group dynamics. Here, we developed a small, wireless, subcutaneously implantable thermo-sensor device and measured body temperature of mouse male and zebra finch mating pairs socially interacting in their home cages (Fig. ). Our longitudinal monitoring of body temperature revealed synchronous fluctuation among social pairs in different contexts and species. We further found dramatic differences in sleep synchrony between mammalian and avian species.