Schaffer and Emerson (1964) found most babies did attach to one person first, however, they also found that a significant minority appeared able to form multiple attachments at the same time
Schaffer states that there is no evidence from societies where infant care is shared between members of the community that there are any negative effects on the child compared to those who only have one significant bond
Brazelton et al. extended the study from an observation to an experiment where primary attachment figures were instructed to ignore their babies' signals
Through the monotropic attachment, the infant would form an Internal working model - a special model for relationships. All the child's future adult relationships will be based on their early attachment relationship