Sex differences in the neural and behavioral response to intranasal oxytocin and vasopressin during human social interaction.
We reported effects of intranasal OT and AVP on behavior and brain activity of human males as they played an interactive social game known as the Prisoner's Dilemma Game. Here, we present findings from an identical study in human females, and compare these with our findings from males. Overall, we f...
Differential neural responses to child and sexual stimuli in human fathers and non-fathers and their hormonal correlates.
We compared fathers of children aged 1-2 with non-fathers in terms of hormone levels (oxytocin and testosterone), neural responses to child picture stimuli, and neural responses to visual sexual stimuli. Compared to non-fathers, fathers had significantly higher levels of plasma oxytocin and lower le...
Testicular volume is inversely correlated with nurturing-related brain activity in human fathers.
We tested this hypothesis by measuring aspects of reproductive biology related to mating effort, as well as paternal nurturing behavior and the brain activity related to it. Both plasma testosterone levels and testes volume were independently inversely correlated with paternal caregiving. In respons...
Effects of intranasal oxytocin and vasopressin on cooperative behavior and associated brain activity in men.
We investigate the impact of intranasally administered oxytocin (OT) and vasopressin (AVP) on behavior and brain activity among men in the context of an iterated Prisoner's Dilemma game, which models a real-life social situation. fMRI results show that, relative to both AVP and placebo, OT increases...