The Strange Situation - Mary Ainsworth (1969)

In 1969, Mary Ainsworth introduced the 'strange situation' to study infant attachment. This method involves observing infants' reactions to a series of scenarios, including separations and reunions with their mothers. The study identifies three main attachment types: secure, ambivalent, and avoidant. In 1990, Main and Solomon added a fourth type, disorganized. Ainsworth's caregiver sensitivity hypothesis suggests that these attachment styles depend on maternal behavior during a critical development period.

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