Hormones / sex role stereotypes - mothers should not be the primary caregiver
Study found that fathers brains are highly malleable & adapt to the level of responsibility they carry for the care of infants.
It was found that the more time they spent with their child, the stronger the synchrony between the different brain areas involved in parental care.
Results also indicate by spending time taking care of their children, fathers can foster the bonds mothers traditionally have.
Implications - shows that single fathers / same-sex couples can be the primary caregivers.