Charles Zeanah (“ZEE-nuh”) devised the New Orleans intervention to treat a disorder named for this phenomenon’s “reactive” form, contrasted with its “disinhibited” form. Patricia Crittenden examined how danger affected this phenomenon in the dynamic-maturational model of this phenomenon and adaptation. Building on her teacher’s work, Mary Main added a “disorganized” form of this phenomenon (15[1])to its “A, B, C” classification. A psychologist influenced by Melanie Klein analyzed the primary form of this phenomenon, known as (*) monotropy, and its “deprivation.” A study in which a parent and another adult enter and leave a room (10[1])with an infant (10[1])inside led its formulator to divide this phenomenon into “secure,” “anxious-avoidant,” and “anxious-ambivalent” styles. For 10 points, Mary Ainsworth’s “strange situation” procedure studied what phenomenon that an infant feels toward a caregiver? ■END■