Answer:
Mary Salter Ainsworth born in Glendale, Ohio in 1913, she earned her doctorate degree in Developmental Psychology from the University of Toronto in 1939. Mary Salter Ainsworth a central figure in psychology because of the work she developed about the attachment relationship between the child and his mother figure. She identified 3 major styles of attachment that children have to their parents or guardians. She separated the types of attachment into three categories: secure attachment, avoidant attachment and resistant attachment.
Step-by-step explanation:
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