Schaffer and Emerson 1964- 4 out of 10 infants formed an attachment with the most responsive person, not the food giver.
Harlow 1958- monkeys attached to the cloth mother rather than the food/wire mother.
Lorenz- imprinting in animals.
Tronick et al 1992- infants in African tribe still had one primary attachment, universal=evolved.
Hazan and Shaver 1987- attachment type predicts future relationships (internal working model).
Schaffer and Emerson 1964- showed infants have multiple attachments, not monotropy.
Hodges and Tizard 1989- chidren adopted at age 4 formed attachment with their new family, which dissproves critical period of <3.
Ainsworth 1970-created Strange Situation.