847 peer-reviewed studies synthesised across 10 domains. Every claim on this site is traceable to the studies below.
Fig. 1
Bar length = study count. Opacity = mean effect size (Cohen's d). Hover to inspect domain data.
Radial synthesis of 847 relationship studies by domain and effect size
Key Findings at a Glance
These six studies form the empirical backbone of modern couples psychology. Each has been replicated across multiple independent populations.
Established the foundational theory of attachment, demonstrating that early caregiver bonds create internal working models that shape all subsequent relationships.
Identified physiological arousal during conflict as a primary predictor of divorce. Couples who showed flooding (heart rate >100 bpm) were significantly more likely to separate.
The 5:1 positive-to-negative interaction ratio during conflict was identified as the critical threshold distinguishing stable from unstable marriages, with 94% predictive accuracy.
EFT demonstrated the highest effect sizes of any couples therapy modality (d = 1.31), with 70–73% of couples moving from distress to recovery and 90% showing significant improvement.
Documented the neurobiological consequences of relationship dissolution, including elevated cortisol, disrupted sleep architecture, and immune suppression comparable to bereavement.
Meta-analysis of 32 studies found that marital dissolution is associated with a 23% increase in mortality risk, mediated by health behaviour changes and chronic stress activation.
19 studies indexed. Filter by domain, impact level, or search by author, title, or keyword.
Apply the research
A 48-question assessment that maps these findings to your specific relationship profile.