Developmental psychology
Attachment theory, originally developed by John Bowlby, focuses on the importance of open, intimate, emotionally meaningful relationships. Attachment is described as a biological system or powerful survival impulse that evolved to ensure the survival of the infant. A child who is threatened or stressed will move toward caregivers who create a sense of physical, emotional and psychological safety for the individual. Attachment feeds on body contact and familiarity. Later Mary Ainsworth developed the Strange Situation protocol and the concept of the secure base.
Caring in intimate relationships
Attachment theory, an influential theoretical framework for the study of intimate relationships and personality development, argues that all humans are born with the capacity and motivation to engage in caregiving behaviours aimed at providing protection and support to close others. These behaviours are organized by an innate behavioural system, called the "caregiving system", which is believed to have emerged over the course of primate evolution to ensure the survival of vulnerable offspring. That is, because infants in many primate species, including humans, are highly altricial ("i.e.", developmentally immature and helpless at birth), they cannot survive without caregiver support and protection. Attachment theory proposes that this evolutionary pressure favoured the emergence of the caregiving behavioural system, which functions to safeguard the vulnerable dependent from harm by providing him or her with protection, comfort, and help during times of threat or need. Although this system was first conceptualized in child–parent bonds, its operation has since been established in adult intimate relationships, where both partners may occasionally take on the role of caregiver.