describe Schaffer and Emerson study
->every four weeks, the researchers visited the mothers and infants and asked them Q's about how their babies responded to a number of everyday situations in which they would be separated from their mother and also how they responded to strangers
->these Q's allowed them to assess separation anxiety, stranger anxiety and the strength of the attachment
->mothers were asked to rate the intensity of the anxiety or protest (e.g, a full-blooded cry or just a whimper) on a four point scale, and also to whom the protest was directed