A History of the Interpersonal Circumplex: From Leary's Berkeley Group to Pincus's Integrative Framework

The Interpersonal Circumplex (IPC) is the rarest sort of object in personality psychology: a structural claim about the geometry of an entire trait domain that has survived seventy years of empirical attack and emerged sharper, not blurrier. The argument, in its strongest form, is that interpersonal behavior — what people do to and with one another — distributes itself in a two-dimensional plane organized by agency (dominance/submission) and communion (warmth/hostility), and that variables in this plane fall on or near a circle. Variables 90° apart are uncorrelated; variables 180° apart are negatively correlated; the correlation between any two variables is a cosine function of the angular distance between them. This is not a metaphor. It is a falsifiable structural hypothesis with formal psychometric criteria and well-developed test statistics, and it keeps passing them.

What follows is a history of how the field got there — from Timothy Leary's Berkeley group in the 1950s through Wiggins's adjective scales, Kiesler's complementarity theory, Pincus's contemporary integrative framework, and the present-day mapping of motive coding, attachment, and Millon's biosocial model onto circumplex space.

Leary, Berkeley, and the original two-axis insight

The standard origin story begins with Timothy Leary's Interpersonal Diagnosis of Personality (1957), published while Leary was research director at the Kaiser Foundation Psychiatric Research Group in Oakland. The book consolidated nearly a decade of work by what came to be called the Berkeley or Kaiser group — Leary, Hubert Coffey, Mervin Freedman, Abel Ossorio, and others — on the structural properties of interpersonal behavior observed in psychotherapy groups.

The Kaiser group's empirical move was to take pools of trait descriptors and behavioral ratings and ask, repeatedly and across samples, what their correlational structure looked like when subjected to the then-new tools of factor analysis. The answer was always the same: two dimensions accounted for almost all of the reliable variance, and those two dimensions corresponded — roughly but unmistakably — to dominance versus submission and to love versus hate. What was novel was not the identification of those axes; clinical writers from Adler onward had pointed to power and affection. What was novel was the geometry. The Kaiser group showed that the full set of interpersonal variables wrapped continuously around the perimeter of a circle defined by those two axes, with hybrid categories filling the angular space between the poles. There was no privileged set of "primary" interpersonal traits hiding among the rest. The structure was rotationally symmetric.

Leary's 1957 octant-and-sector wheel — the Interpersonal Check List organized into sixteen variables grouped into eight octants — became the template for everything that followed.

It is worth pausing on the strength of the empirical claim here. Leary and his colleagues did not propose the circumplex as a heuristic. They proposed it as a structural property of the interpersonal domain that ought to be recoverable, with controlled psychometric error, from any reasonably comprehensive set of interpersonal markers. In the seventy years since, that claim has been tested with increasing methodological sophistication — Guttman's radex model, Browne's circular stochastic process model implemented in CIRCUM (Browne, 1992), Acton and Revelle's (2004) systematic comparison of seven competing fit criteria — and the IPC has, with rare exceptions, satisfied the test.

Foa, Foa, and the post-Leary refinement era

The decade after Leary was a period of refinement and contestation rather than replacement. Uriel and Edna Foa (Foa, 1961; Foa & Foa, 1974) built a related but distinct resource exchange circumplex in social psychology, anchoring the same two-axis structure in a theory of what people give and receive in interaction (love, status, services, goods, money, information). Lorr and McNair (1965), working in psychiatric populations, derived a circumplex from the Interpersonal Behavior Inventory that recovered Leary's structure with cleaner factor loadings. Wiggins (1979) catalogued the family of competing models and argued that they were, beneath their surface notation differences, the same structure recovered through different operationalizations of the same domain.

What this period also did was identify the conditions under which the circumplex fails. Variables drawn from outside the interpersonal domain — task-oriented behaviors, cognitive styles, neurotic complaints — do not arrange themselves on the IPC and should not be expected to. The structural claim is restricted to interpersonal content, defined operationally as content that describes one person's behavior toward another. Inside that boundary, the circle holds. Outside it, there is no reason to expect it to.

Wiggins and the formal psychometrics of circular structure

The transition from "Leary's wheel is approximately circular" to "the IPC satisfies formal circumplex criteria" is largely Jerry Wiggins's accomplishment. Across a sustained program of work in the 1970s and 1980s, Wiggins developed the Interpersonal Adjective Scales (IAS) and its revision (IAS-R), an item set derived by selecting trait adjectives whose intercorrelations conformed to the predictions of a circular model.

Wiggins (1979) labelled the eight octants with two-letter codes that have become the standard nomenclature: PA (Assured–Dominant), BC (Arrogant–Calculating), DE (Cold–Hearted), FG (Aloof–Introverted), HI (Unassured–Submissive), JK (Unassuming–Ingenuous), LM (Warm–Agreeable), and NO (Gregarious–Extraverted). The codes are arbitrary; the geometry is not. The crucial property is that the eight octant scales of the IAS-R, when intercorrelated and subjected to a circumplex fit test, yield a near-perfect circular structure — Gurtman's (1992, 1994) randomization tests and CIRCUM-based fit indices typically place the IAS-R in the upper range of empirically observed circumplex fits.

The internal consistency reliabilities of the IAS-R octant scales are routinely reported in the .80–.90 range across samples (Wiggins, 1995). The angular locations of the octants on the empirically estimated circle deviate from their theoretical 45° spacing by only a few degrees. This is, by the standards of psychometric structural modeling, an extraordinary level of fit. It means that the circumplex is not a researcher's preferred way of summarizing interpersonal data; it is the structure those data actually have.

The two-letter octant code apparatus also clarified what Wiggins called the Big Two — the recognition that the agency and communion axes of the IPC are not idiosyncratic to interpersonal traits. They recover the two highest-order dimensions of personality in nearly every comprehensive trait taxonomy, including the Big Five (where Extraversion projects onto NO and Agreeableness projects onto LM), and they appear as fundamental dimensions in motive theory (McAdams, 1985), values research (Schwartz, 1992), and developmental psychology (Bakan, 1966). The IPC is, in this sense, the geometric realization of a deeper claim about the architecture of social cognition.

Kiesler, complementarity, and the dyadic turn

Wiggins's project was structural; Donald Kiesler's was interactional. Kiesler's 1982 Interpersonal Circle retained the Wiggins geometry but reoriented the theoretical question from "what is the structure of interpersonal traits?" to "what is the structure of interpersonal behavior in dyads?" His central contribution was a formalization of complementarity theory: the empirical regularity that interpersonal behavior tends to elicit predictable counter-behavior from interaction partners.

The complementarity rule is geometrically precise. On the agency axis, behavior elicits its opposite (dominant behavior pulls for submission, submissive behavior pulls for dominance). On the communion axis, behavior elicits its same (friendly behavior pulls for friendliness, hostile behavior pulls for hostility). A friendly-dominant act, then, complementarily pulls for friendly-submissive response from the partner — a 270° → 90° reflection across the horizontal axis. Kiesler (1983, 1996) developed this into a full account of how stable interactional patterns crystallize in dyads, and how rigid adherence to a single sector of the IPC defines what Sullivan and the interpersonal psychiatric tradition had called a parataxic relational style.

Empirically, complementarity has been one of the most-tested predictions in interpersonal psychology. Sadler and Woody (2003) and Markey, Funder, and Ozer (2003) reported correlations between actor and partner IPC behaviors in laboratory dyads in the .30–.50 range — modest by the standards of within-person prediction, but substantial for between-person dyadic dependency, and specifically following the geometric pattern Kiesler predicted.

Pincus, the IIP-C, and the contemporary integrative framework

The contemporary expansion of the IPC into a full clinical and personality-organizational framework is largely the work of Aaron Pincus and his collaborators across the 1990s and 2000s. Three instruments anchor this period:

The Inventory of Interpersonal Problems — Circumplex Scales (IIP-C) (Alden, Wiggins, & Pincus, 1990) restructured the original IIP (Horowitz et al., 1988) into eight 4-item octant scales that satisfy circumplex criteria. The IIP-C is now arguably the most widely used clinical measure of interpersonal dysfunction, with octant alphas typically in the .72–.85 range and circumplex fit indices indicating excellent structural conformity. Octant elevations on the IIP-C predict treatment response, alliance ruptures, and the specific shape of interpersonal difficulties presented in psychotherapy.

The Circumplex Scales of Interpersonal Values (CSIV) (Locke, 2000) extended the IPC into the motivational domain by asking respondents to rate the importance of agentic and communal outcomes in social interaction. CSIV octant scores allow agentic versus communal motivational profiles to be mapped directly into the same geometric space as IIP-C symptoms and IAS-R traits.

The IPIP Interpersonal Circumplex (IPIP-IPC) (Markey & Markey, 2009) provided a public-domain octant measure that has become the workhorse instrument in research applications where the IAS-R cannot be administered for licensing reasons. IPIP-IPC octant alphas are typically reported in the .77–.86 range, with circumplex fit closely matching the IAS-R parent.

Pincus and Ansell (2003) and Pincus (2005) consolidated these strands into what is now called the contemporary integrative interpersonal theory of personality, which uses the IPC as the structural backbone for an account of personality and personality pathology that integrates psychodynamic, cognitive, attachment, and behavioral perspectives. The framework treats the agency and communion axes as the two organizing dimensions along which all clinically relevant interpersonal phenomena — motives, values, traits, behaviors, problems, defenses — can be mapped.

The IPC as a framework for DSM personality disorders

One of the most consequential applications of the IPC has been its proposal as an organizing framework for the DSM personality disorders. Wiggins and Pincus (1989) and Pincus and Wiggins (1990) systematically projected the ten DSM personality disorder constructs onto the IPC using both expert ratings and empirical IIP-C profiles, demonstrating that the personality disorders occupy theoretically expected sectors of circumplex space:

• Cluster A (Paranoid, Schizoid, Schizotypal) loads on the cold/cold-detached side (DE/FG octants).
• Cluster B (Antisocial, Histrionic, Narcissistic, Borderline) loads on the dominant side (PA/BC/NO sectors).
• Cluster C (Avoidant, Dependent, Obsessive-Compulsive) loads on the submissive and unassured-submissive side (HI/JK octants).

Crucially, the IPC projection makes visible what the categorical DSM cannot: the adjacency relations among personality disorders, the substantial overlap between adjacent categories, and the polar oppositions (Narcissistic vs. Avoidant; Antisocial vs. Dependent) that the categorical system obscures. The DSM-5 Alternative Model for Personality Disorders (AMPD) and the broader HiTOP framework (Kotov et al., 2017) both echo this dimensional, structural reading — a vindication of the Wiggins–Pincus argument that personality pathology is interpersonal pathology and that its natural geometry is circular.

The same projection logic places the Big Two of personality (Extraversion and Agreeableness), the two adult attachment dimensions (anxiety and avoidance; Brennan, Clark, & Shaver, 1998), and the IPC sectors into a single integrated nomological network:

Selected references

• Alden, L. E., Wiggins, J. S., & Pincus, A. L. (1990). Construction of circumplex scales for the Inventory of Interpersonal Problems. Journal of Personality Assessment, 55(3-4), 521–536.
• Gurtman, L. B., & Pincus, A. L. (2003). The circumplex model and interpersonal Problems. In R. Plutchik & H. R. Conte (Eds.), Circumplex models of personality and emotions (pp. 113–139). American Psychological Association.
• Kiesler, D. J. (1983). The 1982 interpersonal circle: A taxonomy for complementarity in human transactions. Psychological Review, 90(3), 185–214.
• Kiesler, D. J. (1996). Contemporary interpersonal theory and research: Personality, psychopathology, and psychotherapy. Wiley.
• Leary, T. (1957). Interpersonal diagnosis of personality: A functional theory and methodology for personality evaluation. Ronald Press.
• Pincus, A. L. (2005). A contemporary integrative interpersonal theory of personality disorders. In S. Strack (Ed.), Handbook of personology and psychopathology (pp. 282–298). Wiley.
• Pincus, A. L., & Ansell, E. B. (2003). Interpersonal theory of personality. In T. Millon & M. J. Lerner (Eds.), Handbook of psychology: Personality and social psychology (Vol. 5, pp. 209–229). Wiley.
• Wiggins, J. S. (1979). A psychological taxonomy of trait-descriptive terms: The interpersonal domain. Journal of Personality and Social Psychology, 37(3), 395–412.
• Wiggins, J. S. (1991). Agency and communion as conceptual coordinates for the understanding and measurement of interpersonal behavior. In W. M. Grove & D. Cicchetti (Eds.), Thinking clearly about psychology (Vol. 2, pp. 89–113). University of Minnesota Press.
• Wiggins, J. S. (1995). Interpersonal Adjective Scales professional manual. Psychological Assessment Resources.
• Wiggins, J. S., & Pincus, A. L. (1989). Conceptions of personality disorders and dimensions of personality. Psychological Assessment, 1(4), 305–316.
• Wiggins, J. S., & Trobst, K. K. (1997). When is a circumplex an "interpersonal circumplex"? The case of supportive actions. In R. Plutchik & H. R. Conte (Eds.), Circumplex models of personality and emotions (pp. 57–80). American Psychological Association.