Hypothesis 3 (i): Compared to secure (Type B) mothers, mothers with insecure/dismissing (Type A) attachment will have a greater brain and behavioral response to IN-OT (as described in Hypotheses 1 and 2), with a 2-way interaction effect seen between treatment and attachment groups. Hypothesis 3 (ii): Compared to Type B mothers, mothers with insecure/preoccupied (Type C) attachment will have a reduced brain and behavioral response to IN-OT (as described in Hypotheses 1 and 2), with a 2-way interaction effect seen between treatment and attachment groups.