How Childhood Attachment Styles Shape Adult Relationships

The Infant Who Would Not Be Comforted

In Mary Ainsworth's Strange Situation procedure, developed in the late 1960s, one specific group of infants behaved in a way that puzzled observers. When their caregiver left the room, these children became intensely distressed. When the caregiver returned, they ran toward her—and then pushed her away. They sought comfort and resisted it simultaneously. Ainsworth labeled this pattern anxious-ambivalent attachment. What she could not have fully anticipated was that decades of subsequent research would find this same push-pull dynamic showing up in the romantic relationships of those same children, twenty or thirty years later.

John Bowlby, the British psychiatrist whose evolutionary framework inspired Ainsworth's empirical work, proposed in his three-volume Attachment and Loss series (1969–1980) that humans are biologically primed to form strong emotional bonds with caregivers, and that these early bonds create internal working models—cognitive-emotional templates for how relationships function. These templates, Bowlby argued, are not easily overwritten.

The Four Attachment Styles

Ainsworth's original Strange Situation research identified three primary patterns. A fourth—disorganized attachment—was added by Mary Main and Judith Solomon in 1986 based on observations that did not fit the original three categories.

Approximately 60–65% of infants in low-risk Western samples show secure attachment, according to a large-scale meta-analysis by Marinus van IJzendoorn and Pieter Kroonenberg published in Child Development in 1988. The remaining 35–40% show insecure patterns, with avoidant attachment being most common in some samples and anxious patterns more prevalent in others depending on cultural context.

From Infancy to Adulthood: The Continuity Question

Cindy Hazan and Phillip Shaver proposed in a landmark 1987 paper in the Journal of Personality and Social Psychology that adult romantic love functions as an attachment process. Their questionnaire-based study found that approximately 56% of adults described themselves as securely attached, 25% as avoidant, and 19% as anxious in romantic relationships—proportions strikingly similar to those found in infant research.

• Secure adults described relationships as happy, trusting, and enduring
• Avoidant adults reported discomfort with emotional closeness and fear of dependence
• Anxious adults described love as preoccupying, intense, and often marked by jealousy
• The Minnesota Longitudinal Study of Risk and Adaptation found modest but statistically significant continuity between infant attachment classifications and relationship quality at age 21

The Minnesota study, led by L. Alan Sroufe and colleagues at the University of Minnesota over more than two decades, is among the most comprehensive longitudinal investigations of attachment. It documented that securely attached infants were more likely to develop close friendships in childhood, handle conflict more constructively in adolescence, and sustain longer romantic relationships in young adulthood. The correlations were meaningful but not deterministic. Life experiences intervene.

The Internal Working Model in Action

Phillip Shaver and Mario Mikulincer's research program, spanning multiple published volumes, has mapped out how internal working models operate in adult relationships. Securely attached adults tend to approach conflict as a problem to be solved rather than a threat to the relationship. They seek support from partners when stressed and provide support effectively. Anxious individuals hyperactivate attachment-seeking behavior under stress—they push for reassurance in ways that can paradoxically push partners away. Avoidant individuals deactivate attachment systems—they suppress emotional needs and withdraw when closeness intensifies.

Can Attachment Styles Change?

Attachment patterns are not fate. Earned security—a term used by Mary Main to describe adults who had difficult early attachments but developed coherent, reflective narratives about those experiences—has been documented in research using the Adult Attachment Interview. Adults who had insecure early attachments but engaged in significant reflective work showed parenting behaviors and relationship patterns more similar to securely attached individuals than to those who remained unresolved.

Therapeutic interventions targeting attachment have shown empirical support. Emotionally Focused Therapy (EFT), developed by Susan Johnson and Les Greenberg in the 1980s, specifically targets attachment insecurity in couples. A meta-analysis by Johnson and colleagues found large effect sizes for EFT in reducing relationship distress. The brain remains plastic; working models update when relationships consistently disconfirm their predictions.

• Research by Jeffry Simpson and colleagues shows that major life events—divorce, bereavement, supportive partnerships—can shift attachment classifications
• Secure romantic partners can function as "attachment figures" whose consistent availability gradually updates anxious or avoidant models
• Mindfulness-based interventions have shown preliminary evidence for reducing attachment anxiety by increasing tolerance of relational uncertainty

The Strange Situation procedure lasted twenty minutes. Its effects, according to the weight of longitudinal evidence, can last a lifetime—though the word "can" is critical. Bowlby's internal working models are best understood not as programs running silently in the background but as hypotheses the mind continually tests against new relational data.