The nature of attachment systems

Attachment theory is an enduring and generative framework for understanding infant and romantic relationships. As a lifespan phenomenon, attachment research has focused largely on developmental processes and how to link the infant attachments with later close relationships, but there has been comparably less scholarly attention targeted at the evolutionary origins and functionality of romantic attachments, in particular. Here, I advance a two‐system approach to attachment, proposing that infant attachments and romantic attachments constitute etiologically distinct systems that evolved in response to different selection pressures, serve different evolutionary functions, and are fundamentally different in nature with regard to operation and necessity toward their respective evolutionary goals. This two‐system approach has downstream implications for future attachment research, most notably with regard to how the romantic attachment system develops over the lifespan, and the extent to which romantic attachments guide the formation of relationships in adulthood.