LPF as the Structural Motivational Components That Fulfill an Intrapsychic, Organizing Function
Kernberg’s object relations model of personality organization (
26) postulates that affectively charged early experiences in caregiver-infant interactions are gradually internalized as object relations dyads of self-other representations and provide the fundamental building blocks of personality organization. In early development, these object relations dyads are unintegrated: representations of self and other are not well differentiated, and there is a split between all-good and all-bad (persecutory) experiences. In typical development, object relations dyads become more integrated, resulting in a healthy personality structure, of which the hallmark feature is a coherent, integrated, and stable identity and a capacity for reciprocal and healthy relationships with attachment figures—in AMPD terms, adaptive self- and interpersonal functioning. In contrast, in pathological psychic functioning, integration and differentiation of self-other representations are delayed, partially achieved, or absent, resulting in identity diffusion and maladaptive interpersonal relationships (
9,
27,
28)—in AMPD terms, maladaptive self- and interpersonal functioning.
Kernberg’s theory of personality function is a structural one, in the tradition of psychoanalytic theory. With its focus on internal representations of self in relation to others, personality is given a meaning-making function that organizes subjective experience and interpersonal functioning. This means that personality
does something; it has an active intrapsychic function that organizes subjective experience and behavior in relatively predictable ways. In contrast, traits happen to people; they are dispositions that are biologically grounded in temperament. Through interaction with the environment, traits become the consequences or manifestations of intrapsychic function. In this sense, Kernberg’s object relations theory both describes and explains personality function and can be understood as a process theory of personality functioning (
24). Internal object relations (representations of self and others) can be thought of as schemas that are activated in particular situations and then enacted. In this sense, representations are not mere historically valid representations of early attachment relations but are constructions of one’s relational reality in the present moment. Akin to mentalization-based theory (
29), Kernberg’s theory suggests that the decoupling between what is in the mind of the individual and what is present in the real world is the hallmark of healthy personality functioning.
A structural diagnosis in the Kernbergian sense involves an assessment of the severity of personality pathology (
30). Four levels of severity in personality organization are described: normal, neurotic, borderline, and psychotic (
30). Borderline personality organization is further characterized on a dimension, ranging from low in organization (associated with more pathology) to high in organization (associated with less pathology). An assessment of identity consolidation (or, conversely, diffusion), such as the Structured Interview of Personality Organization–Revised (
31), can be used to distinguish between organization severity levels (
26,
30). Like the AMPD criteria, each level represents a diagnostic prototype (or mode of psychic functioning) that conveys information about severity and prognosis of pathology, guides treatment planning, and facilitates communication among clinicians (
32).
Table 1 provides the adaptive and maladaptive end points of the levels of severity across aspects of personality functioning according to Kernberg’s model (
33).
In this model, identity consolidation represents the sum of healthy object relations, mature defenses, integration of aggressive impulses, and owned and understood moral values. For Kernberg, the term “severity” does not mean dysfunction or disability (e.g., GAF scores or total p factor score) as it does for trait psychologists. Instead, in Kernberg’s theory, severity is defined as an individual’s subjective experience of themselves and their attachment (object) relationships, the nature of their defensive operations, and the stability of their reality testing. Therefore, severity is not the consequence of personality disorder but its cause or its source (
7)—that is, the structural motivational components in the domains of self- and interpersonal functioning that fulfill an intrapsychic, organizing function. It follows that a more effective strategy for treating personality pathology would be to target underlying processes that organize all personality disorders—that is, maladaptive self-other representations (object relations), or, in AMPD terms, maladaptive self- and interpersonal functioning (criterion A). In contrast to trait-based solutions to treating personality pathology (
14), which promote the targeting of individual symptoms or behaviors (e.g., emotion dysregulation, self-harm), Kernberg suggests treating its cause, because in his model, treating the manifestations of personality pathology rather than its cause is associated with “risk of treatments devolving into repetitive cycles of chasing symptoms or unfocused pursuit of psychological exploration” (
33).
The shift toward targeting the common core (criterion A) of personality pathology that encompasses all manifestations or personality disorder flavors (criterion B) is supported by factor analytic research that has demonstrated that borderline personality disorder, as defined in section II of the
DSM-5, appears to load exclusively onto a general factor of personality pathology, whereas other section II personality disorders appear to represent specific factors or maladaptive trait constellations (
34–
36). Thus, section II–defined borderline personality disorder (like criterion A) may represent the common core features shared by all personality pathologies (
22,
23,
37,
38). This conclusion makes sense when considering the fact that, compared with other personality disorders, which were often reduced to purely behavioral manifestations of personality pathology in the
DSM-IV, the diagnosis of borderline personality disorder retains explicit criteria reflective of intrapsychic, maladaptive self- and interpersonal functioning (
21). The extent to which section II borderline personality disorder fully captures the general factor of personality pathology and, therefore, criterion A remains an empirical question. However, given their suggested overlap (at least in adults), it is possible to argue that borderline personality disorder, the general factor of personality pathology, or criterion A represents an index of increased severity in psychopathology (
12,
22,
23,
39), somewhere along the pathway between the internalizing and externalizing spectra and psychoticism—exactly as Kernberg predicted (
9,
17).
Identity Formation and Consolidation as the Essence of Healthy Personality Functioning
Because Kernberg gives identity function a coalescing role as the sum of healthy object relations, mature defenses, integration of aggressive impulses, and healthy moral functioning, his understanding of the nature of personality pathology also provides an answer to the question of why personality pathology has its onset in adolescence. As Erikson (
13) pointed out more than 50 years ago, one of the major tasks of adolescence is to establish a coherent and integrated sense of self, which facilitates adult role function. To achieve this, an adolescent must successfully navigate the process of becoming a separate individual while remaining connected to others—most notably to parental attachment figures. During adolescence, significant developmental advances in the meta-cognitive capacity for self-reflection and for mentalizing facilitate the ability to, for the first time, ask questions such as, “Who am I?” “How do I want others to view me?” and “How do I fit into the larger social world?” (
22,
40,
41). Although some of the developmental building blocks of these capacities are observable during preadolescence, it is not until adolescence that unintegrated aspects of self-functioning (e.g., self-concept, self-esteem, self-directedness, self-reflection) begin to coalesce (or bind) into a unidimensional continuum that ranges from healthy to unhealthy personality functioning (
21,
42). At this stage, for the first time, an adolescent can symbolize, perceive, and organize experience into some meaningful relation to the self. In the case of personality disorder, these processes do not bind into a coherent sense of self, and personality pathology ensues. It is critical to understand that without consideration of the structural motivational components, in the domains of self- and interpersonal functioning, that fulfill an intrapsychic, organizing function, trait function alone cannot distinguish whether an adolescent is on the way to developing personality pathology or simply struggling with normative developmental issues or internalizing or externalizing problems.