chomsky language theory

argue that humans are born with the innate capacity for language (nature) known as universal grammar suggesting genetics play a specific role in language development.

lad - language aquisation device

allows children to demonstrate and understand gramatical structures they have never been taught

skinners theory agrues this as it emphasizes the role of enviromental enforcment and learning in language aqusition

strange sitiuation - ainsworth

measures how infants respond to seperations and reunions with theior care givers