Glossary
Object constancy.
Object constancy is the developmental capacity to hold a stable, integrated mental representation of another person across their absence and across one's own changing emotional states. It includes the capacity to remain affectionate toward someone when one is angry with them. It is often impaired in narcissistic and borderline personality pathology.
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Definition
The term has roots in developmental psychology (Jean Piaget's work on object permanence in infants) and was elaborated for object relations in psychoanalytic literature (Margaret Mahler, in particular). The mature form: a healthy adult can be furious with a partner, leave the room, and still know — without effort — that the partner is the same person who loves them, that the partner will be there when they return, and that the partner's good qualities have not disappeared because of the current grievance. The capacity is so taken for granted by people who have it that they often don't realize it is a capacity.
What impairment looks like
In narcissistic pathology, particularly in malignant cases and in personalities with borderline features, object constancy is unstable. When the partner is in the room and supplying narcissistic supply, they exist as the loving, valued figure of the relationship. When the partner is out of sight, or has just delivered a perceived injury, the mental representation of them flips. They become, in that moment, fundamentally bad — not someone with mixed qualities but someone whose good qualities cease to exist.
This is the underlying mechanism behind the classical psychoanalytic concept of splitting. Object constancy is what splitting fails. The partner's experience of the dynamic, from the outside, is the famous oscillation: this morning they were the most loved person in the world; this afternoon they are the most hated; tomorrow morning they will be loved again.
Why it produces the cycle
The four-phase cycle of idealization, devaluation, discard, and hoover can be understood, in part, as the lived expression of impaired object constancy. The idealization phase is the partner-as-all-good representation. The devaluation phase is the partner-as-all-bad representation. The discard is the conclusion of that representation. The hoover, days or months later, is the all-good representation returning. None of this is, from inside the narcissist, planned or strategic; it is the way the narcissist's mind is structured, playing out in the relationship.
The implication for survivors
It is not, in most cases, that the narcissist was “faking” the affection during the good phases. The affection during the good phases was real; the contempt during the bad phases is also real; what is missing is the connective tissue between them, which is why neither version of the partner ever feels stable. Recovery from a long-term relationship with someone whose object constancy is impaired generally involves the slow recognition that there was no stable version of them to come back to.
