Another weakness is that it is environmentally deterministic. Meaning that early learning determines later attachment behaviours- ignoring the role of nature and evolutionary benefits of an attachment- it would seem highly unlikely that instinct has nothing to do with formation of attachments. If forming attachments was environmentally determined, attachment should be different all over the world but it isn't, e.g. everyone attached to parents. Therefore, there is too much emphasis on nurture, not innate biological processes.