 Phase 1a. -functional magnetic resonance imaging fMRI with oxytocin 24 IU vs. placebo oxytocin 0 IU - funded by grant U54 HD079124-01, Phase 1b-eye-trackingoxytocin 24 IU vs. placebo oxytocin 0 IU, Phase 2a. fMRI oxytocin 8 IU vs. oxytocin 40IU, Phase 2b. -eye-tracking oxytocin 8IU vs. oxytocin 40IU. Time course of effect will also be assessed within session. 