access, an ambivalent organization develops. In retrospect, internal working models are constant with and reflect the primary relationship with our caregivers. Childhood attachment directly influences our adult relationships. A parent's internal working model that is operative in the attachment relationship with her infant can be accessed by examining the parent's mental representations. Recent research has demonstrated that the quality of maternal attributions as markers of maternal mental representations can be associated with particular forms of maternal psychopathology and can be altered in a relative short time-period by targeted psychotherapeutic intervention. Cybernetics The theory of control systems (cybernetics), developing during the 1930s and 1940s, influenced Bowlby's thinking. The young child's need for proximity to the attachment figure was seen as balancing homeostatically with the need for exploration. (Bowlby compared this process to physiological homeostasis whereby, for example, blood pressure is kept within limits). The actual distance maintained by the child would vary as the balance of needs changed. For example, the approach of a stranger, or an injury, would cause the child exploring at a distance to seek proximity. The child's goal is not an object (the caregiver) but a state; maintenance of the desired distance from the caregiver depending on circumstances. Cognitive development Bowlby's reliance on Piaget's theory of cognitive development gave rise to questions about object permanence (the ability to remember an object that is temporarily absent) in early attachment behaviours. An infant's ability to discriminate strangers and react to the mother's absence seemed to occur months earlier than Piaget suggested would be cognitively possible. More recently, it has been noted that the understanding of mental representation has advanced so much since Bowlby's day that present views can be more specific than those of Bowlby's time. Behaviourism In 1969, Gerwitz discussed how mother and child could provide each other with positive reinforcement experiences through their mutual attention, thereby learning to stay close together. This explanation would make it unnecessary to posit innate human characteristics fostering attachment. Learning theory, (behaviourism), saw attachment as a remnant of dependency with the quality of attachment being merely a response to the caregiver's cues. The main predictors of attachment quality are parents being sensitive and responsive to their children. When parents interact with their infants in a warm and nurturing manner, their attachment quality increases. The way that parents interact with their children at four months is related to attachment behavior at 12 months,