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In a recent article in Perspectives on Psychological Science, Ein-Dor et al. (2010) propose that insecure attachment styles harm the biological fitness of individuals, yet may have been favored by natural selection because they provide benefits for the group. This novel hypothesis proclaims that groups containing a mixture of secure and insecure attachment styles deal more effectively with hazards, such as venomous snakes or fires, because of earlier detection and escape. While I support adaptationist approaches to development, including attachment, I have concerns about this specific proposal. In particular, I question: (1) that insecure attachment styles are detrimental to individual fitness, (2) that insecure attachment styles are well-designed for dealing with danger at the group-level, (3) the underlying assumption that human attachment styles evolved in social groups comprised mostly of genetic relatives, (4) whether the empirical evidence, provided by the authors, can arbitrate between hypotheses postulating benefits to individuals versus benefits to groups.

Did Insecure Attachment Styles Evolve for the Benefit of the Group?