- designed to see how infants 9-18 months behaved in new, mildly stressful conditions- mother + child introduced to room - parent sits while infant plays and explores- stranger enters the room talks with mother - stranger approaches child with a toy- mother leaves child with stranger- mother returns, picks up child and stranger leaves - mother leaves so child is on their own- stranger returns and tries engage with child- mother returns to comfort childfound:- secure attachment = high exploration, moderate stranger anxiety and separation anxiety, easily comforted in reunion behaviour I-> when upset, attachment figure responds warmly and comforts child -> child feels safe and seeks caregiver in need of comfort- insecure avoidant = high exploration, low stranger anxiety and separation anxiety, avoids contact reunion behaviourI-> caregiver rejects child when upset and feels annoyance -> child learns to avoid caregiver when in need of comfort, and avoid displaying negative emotions in caregiver's presence- insecure resistant = low exploration, high stranger anxiety and separation anxiety, seeks and rejects reunion behaviour I-> caregiver is inconsistent in response to child, may prioritise own emotional needs over child -> child learns attention is valuable but can be unreliable -> child reacts with intense displays of negative emotion when need comfort, and is cautious to seek comfort they crave = seek + reject behaviour