Attachment security in infancy and early adulthood: a twenty-year longitudinal study

Area of Science:

• Developmental Psychology
• Attachment Theory
• Lifespan Psychology

Background:

• Attachment security established in infancy is theorized to have lasting effects.
• The Ainsworth Strange Situation and Berkeley Adult Attachment Interview are key measures.
• Longitudinal studies are crucial for understanding attachment stability and change.

Purpose of the Study:

• To examine the long-term stability of infant attachment classifications into early adulthood.
• To investigate the impact of negative life events on attachment security changes.
• To provide empirical support for Bowlby's attachment theory regarding lifespan development.

Main Methods:

• Longitudinal study tracking 50 participants from infancy (12 months) to early adulthood (20 years later).
• Utilized the Ainsworth Strange Situation for infant assessment and the Berkeley Adult Attachment Interview (AAI) for adult assessment.
• Interviewers were blinded to infant Strange Situation classifications.

Main Results:

• 72% of participants maintained their secure versus insecure attachment classification from infancy to adulthood (K = .44, p < .001).
• Participants experiencing negative life events (e.g., parental loss, divorce, illness, abuse) were more likely to change attachment classification (44% vs. 22%, p < .05).
• Attachment security demonstrates significant stability but is also sensitive to adverse life experiences.

Conclusions:

• Infant attachment security is a relatively stable individual difference across the lifespan.
• Negative life events play a critical role in modifying attachment security over time.
• Further research is needed to elucidate the mechanisms of attachment stability and change.