Which specific defence mechanism is most characteristically associated with Borderline Personality Disorder (BPD) and contributes to the unstable interpersonal relationships seen in this condition?

• A Sublimation
• B Projection
• C Rationalisation
• D Splitting ✓

Explanation

Splitting is the defence mechanism most pathognomically associated with Borderline Personality Disorder. It involves the inability to integrate the positive and negative qualities of oneself and others into a cohesive whole — people and situations are perceived as entirely good or entirely bad, with rapid shifts between idealisations and devaluations ('I love you / I hate you'). This failure to achieve object constancy (Kleinian concept of the depressive position) is thought to arise from early developmental disruption and invalidating environments. Splitting also operationally divides treatment teams in inpatient settings, creating conflict among staff (staff splitting).

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

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