In the book ["Psychologie" by Richard J. Gerrig, Philip Zimbardo][1] 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][2])

*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?**

  <sub>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.][2]</sub>


  [1]: https://www.pearson-studium.de/psychologie_1.html
  [2]: http://www.sciencedirect.com/science/article/pii/S0896627308003279