Schaffer and Emerson (1969)
Longitudinal and Naturalistic observational study
60 babies from birth to 18 months
observed with caregivers to see separation anxiety + stranger anxiety
interviews conducted with family members
Babies formed stronger attachments if caregivers displayed high sensitive responsiveness.
Evidence for the four stages of attachment.
87% of babies formed attachments with 2+ caregivers.
31% of babies formed attachment with 5+ caregivers
main attachment figure not always main caregiver