Dialectical Behaviour Therapy (DBT), developed by Marsha Linehan, is the evidence-based psychotherapy of choice for Borderline Personality Disorder. Which of the following correctly describes its core theoretical model?

• A BPD arises from childhood trauma; DBT focuses on trauma processing through narrative reconstruction
• B BPD is driven by cognitive distortions; DBT corrects faulty schemas through Socratic dialogue
• C BPD reflects unconscious conflict; DBT uses transference interpretation in group settings
• D BPD results from a biosocial interaction between emotional vulnerability and an invalidating environment; DBT teaches dialectical balance between acceptance and change ✓

Explanation

Linehan's biosocial theory proposes that BPD develops from an interaction between a biologically vulnerable individual (high emotional reactivity/sensitivity) and an invalidating environment. DBT integrates acceptance-based strategies (mindfulness, validation) with change-based strategies (CBT, skills training) — the 'dialectic' being the synthesis of acceptance and change. DBT has 4 skill modules: mindfulness, distress tolerance, emotion regulation, and interpersonal effectiveness. It is the most evidence-based treatment for BPD, reducing self-harm, suicidality, and hospitalization rates.

Reference: Kaplan & Sadock's Synopsis of Psychiatry, 11th ed.

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