Brain Dynamics of Oxytocin

Study Summary

Oxytocin is a neuropeptide that is well known for its role in social and affiliative behavior in humans. Oxytocin receptors are significantly lowered in autistic individuals and administration of oxytocin has shown benefits in enhancing social recognition and behavior in autistic children. However, more recent research has refined the behavioral effects of oxytocin, moving away from the notion that the neuropeptide blindly induces love and trust, towards the view that it actually increases social perception in assessing friend vs. foe: supporting cohesion with 'insiders' and distrust and aggression for 'outsiders.' Oxytocin is responsible for the selective aggression shown by lactating female mammals protecting their young, an effect demonstrated also in humans, and has been shown to strengthen feelings of ethnocentrism. However, no neuroimaging study to date has investigated this effect, with the consequence that its neurobiological basis is still unknown. The general aim of our study is to determine meso-circuit brain dynamics that underlie oxytocin's amplification of both trust and aggression; and specifically, using neuroimaging (fMRI, magnetoencephalography, and behavioral testing) whether oxytocin amplifies kinship bias by attenuating social reward learning.

Primary Outcome

This study recruited healthy adults. Subjects participated in an interactive neuroeconomic game, an iterative version of the classical "Trust Study." During this game, the subject ('investor') is first provided a sum of money (20 units). He then has the choice in terms of how much to invest in a fictional computer-generated trustee. The trustee then sends some percentage back to the subject ('investor'), and the game iterates over 20 trials (rounds). We computed the investment ratio as the ratio

Conditions Studied

Interventions

• DRUG Syntocinon Nasal Spray, 40IU
• DRUG Syntocinon Placebo Formulation, 40IU

Study Locations (3)