However, there continues to be much debate about the origins of the child's reaction in the Strange Situation, and about what factors influence the development of an infant's attachment relationships. The security of attachment in one- to two-year-olds was investigated by Ainsworth and Bell (1970) in the '_strange situation_' study, in order to determine the nature of attachment behaviours and types of attachment. Ainsworth (1970) developed an experimental procedure in order to observe the variety of attachment forms exhibited between caregivers and infants. The experiment is set up in a small room with one way glass so the behaviour of the infant can be observed. Infants were aged between 12 and 18 months. The sample comprised about 100 middle class American families. The procedure, known as the ‘_Strange Situation_’, was conducted by observing the behaviour of the caregiver and the infant in a series of seven 3-minute episodes, as follows: (1) Parent and infant alone. (2) Stranger joins parent and …show more content…
An observer (often a researcher or therapist) takes a mother and her child (usually around the age of 12 months) to an unfamiliar room containing toys. A series of eight separations and reunions are staged involving mild, but cumulative, stress for the infant. Separation in such an unfamiliar setting would also likely activate the child's attachmentsystem and allow for a direct test of its functioning. Although no single behaviour can be used to assess the quality of the infant's attachment to the caregiver, the pattern of the infant's responses to the changing situation is of interest to psychologists. The validation of the procedure and its scoring method were grounded in the naturalistic observation of the child's exploration, crying, and proximity-seeking in the