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Mary Ainsworth theorist is associated with a laboratory procedure called the strange situation.

Mary Ainsworth developed the standardised approach known as the odd circumstance in the 1970s to study children's levels of attachment security in the setting of caregiver interactions. Infants between the ages of nine and 18 months are covered. This Strange Situation approach involves watching a child play for 21 minutes as family members and strangers come and go from the room, simulating the flow of familiar and strange presence in most children's lives. The degree of stress in the circumstance changes, and the child's reactions are seen. an experimental method for evaluating the degree of attachment in young children and infants (up to the age of 2).

The method exposes the youngster to increasing levels of stress brought on by a new person entering the room and two brief separations from the parent.

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