In the book "Psychologie" by Richard J. Gerrig, Philip Zimbardo I read there are studies claiming that:
"die gegenwärtige Forschung legt nahe, dass das Hormon eine facettenreiche Rolle bei persönlichen und sozialen Prozessen spielt" (IsHak et al., 2011)
Translation: Recent studies suggest that the hormone plays a diverse role in personal and social processes
Another study was carried out in order to examine the effects of oxytocin on trust. In this study, half of subjects where given a dose of oxytocin, and the other half not. Furthermore, they carried out fMRT scans to examine the areas on which the oxytocin had an effect on. The study showed that:
die Scans ergaben, dass Oxytozin-Teilnehmer weniger Aktivität in GehirnRegionen aufwiesen, die wie Amygdala mit Furchtreaktionen in Zusammenhang stehen. (Baumgartner et al., 2008)
Translation: The scans suggested that participants who were given a dose of oxytocin showed less brain activity in regions which are, like the amygdala, associated with fear.
Unfortunately, I do not have access to the paper where this seems to be described (Baumgartner et al. 2008).
To what extent does oxytocin reduce brain activity and in which regions?
Baumgartner, T., Heinrichs, M., Vonlanthen, A., Fischbacher, U., & Fehr, E. (2008, May 22). Oxytocin Shapes the Neural Circuitry of Trust and Trust Adaptation in Humans.