Research has found that caregivers and infants interact with one another to help develop and maintain attachments. One example of a caregiver-infant interaction is reciprocity which refers to when the caregiver and infant interact in a turn-taking fashion. The responses made by the caregiver and infant may be the same (e.g. if a caregiver smiles, their infant may smile back) or different (e.g. if a caregiver makes a funny facial expression, the infant may giggle).