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  1. Effects of intranasal oxytocin and vasopressin on cooperative behavior and associated brain activity in men.

    Psychoneuroendocrinology 37(4):447 (2012) PMID 21840129 PMCID PMC3251702

    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...
  2. Differential neural responses to child and sexual stimuli in human fathers and non-fathers and their hormonal correlates.

    Psychoneuroendocrinology 46:153 (2014) PMID 24882167

    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...
  3. Testicular volume is inversely correlated with nurturing-related brain activity in human fathers.

    PNAS 110(39):15746 (2013) PMID 24019499 PMCID PMC3785737

    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...
  4. Sex differences in the neural and behavioral response to intranasal oxytocin and vasopressin during human social interaction.

    Psychoneuroendocrinology 39:237 (2014) PMID 24157401 PMCID PMC3842401

    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...
  5. Behavioral and genetic correlates of the neural response to infant crying among human fathers.

    Social Cognitive and Affective Neuroscience 9(11):1704 (2014) PMID 24336349 PMCID PMC4221211

    We explored the neural response to infant cries in fathers of children aged 1-2, and its relationship with hormone levels, variation in the androgen receptor (AR) gene, parental attitudes and parental behavior. Although number of AR CAG trinucleotide repeats was positively correlated with neural act...