A modern evolutionary perspective emphasizing life history theory and
behavioral ecology is brought to bear on the three core patterns of at
tachment that are identified in studies of infants and young children
in the Strange Situation and adults using the Adult Attachment Intervi
ew. Mating and parenting correlates of secure/autonomous, avoidant/dis
missing, and resistant/preoccupied attachment patterns are reviewed, a
nd the argument is advanced that security evolved to promote mutually
beneficial interpersonal relations and high investment parenting; that
avoidant/ dismissing attachment evolved to promote opportunistic inte
rpersonal relations and low-investment parenting; and that resistant/p
reoccupied attachment evolved to foster ''helper-at-the-nest'' behavio
r and indirect reproduction.