A study into the sensitivity of a parent or caregiver relation to the type of attachment formed by a child.
106 middle class infants aged 12-18 moths were observed.
Mother and child enter the playroom, the child is encouraged to explore, stranger enters and attempts to interact, mother leaves while stranger is present, mother enters and the stranger leaves, mother leaves, mother returns and interacts with the child.
66% of children had a secure attachment
22% had an insecure-avoidant attachment
12% had an insecure-resistant attachment