Narcissism is one of the oldest personality constructs, and yet debates about its definition and structure have been a topic of intense debate over the past decade. Recent independent reviews of the literature have proposed conceptually identical triarchic structural models of individual differences in pathological narcissism. In each model entitlement serves as the core of the construct, and its expression is moderated by basic personality/temperament to manifest in exhibitionism or vulnerability. However, the clinical observation that individuals high in pathological narcissism vacillate between grandiose and vulnerable states remains understudied and poorly understood. We review the recent research that has driven the contentious debates, emerging points of consensus, and necessary future directions for research.

Theories of narcissism emphasize the dynamic processes within and between grandiosity and vulnerability. Research seeking to address this has either not studied grandiosity and vulnerability together or has used dispositional measures to assess what are considered to be momentary states. Emerging models of narcissism suggest grandiosity and vulnerability can further be differentiated into a three-factor structure-Exhibitionistic Grandiosity, Entitlement, and Vulnerability. Research in other areas of maladaptive personality (e.g., borderline personality disorder) has made headway in engaging data collection and analytic methods that are specifically meant to examine such questions. The present study took an exploratory approach to studying fluctuations within and between grandiose and vulnerable states. Fluctuations-operationalized as gross variability, instability, and lagged effects-were examined across three samples (two undergraduate and a community sample oversampled for narcissistic features; total person N ϭ 862, total observation N ϭ 36,631). Results suggest variability in narcissistic states from moment to moment is moderately associated with dispositional assessments of narcissism. Specifically, individuals who are dispositionally grandiose express both grandiosity and vulnerability, and vary in their overall levels of grandiosity and vulnerability over time. On the other hand, dispositionally vulnerable individuals tend to have high levels of vulnerability and low levels of grandiosity. Entitlement plays a key role in the processes that underlie narcissism and narcissistic processes appear unique to the construct and not reflective of broader psychological processes (e.g., self-esteem). Future research should consider using similar methods and statistical techniques on different timescales to study dynamics within narcissism.

There is growing interest in understanding the fluctuations in grandiose and vulnerable narcissistic states over time. Momentary data collection is vital in facilitating this new area of inquiry. Two narcissism adjective scales, the Narcissistic Grandiosity Scale and the Narcissistic Vulnerability Scale, have recently been developed for this purpose. In the present study, the validity of these 2 scales was examined across 3 different samples. Results indicate that these measures perform well psychometrically at both the momentary-and trait-level. Multilevel exploratory factor analyses reveal a clear 2-factor structure at both the within-and between-person level. Within-person correlations between these scales and other momentary scales (e.g., the Positive and Negative Affect Schedule) are consistent with theoretical expectations. Finally, individual differences in endorsement of both of these scales correlated with other dispositional measures, including existing narcissism measures (e.g., The Pathological Narcissism Inventory and The Five Factor Narcissism Inventory), at the between-person level in the expected manner. We conclude these scales are well-suited for momentary narcissism assessment in studies wishing to examine fluctuations in grandiosity and vulnerability. Public Significance StatementThis study demonstrates the validity of scales that were developed to assess momentary narcissism states. These scales provide researchers and clinicians with the tools needed to reliably and validly assess fluctuations in grandiosity and vulnerability in day-to-day life.

Personality and psychopathology are composed of dynamic and interactive processes among diverse psychological systems, manifesting over time and in response to an individual's natural environment. Ambulatory assessment techniques promise to revolutionize assessment practices by allowing access to the dynamic data necessary to study these processes directly. Assessing manifestations of personality and psychopathology naturalistically in an individual's own ecology allows for dynamic modeling of key behavioral processes. However, advances in dynamic data collection have highlighted the challenges of both fully understanding an individual (via idiographic models) and how s/he compares with others (as seen in nomothetic models). Methods are needed that can simultaneously model idiographic (i.e., person-specific) processes and nomothetic (i.e., general) structure from intensive longitudinal personality assessments. Here we present a method, group iterative multiple model estimation (GIMME) for simultaneously studying general, shared (i.e., in subgroups), and person-specific processes in intensive longitudinal behavioral data. We first provide an introduction to the GIMME method, followed by a demonstration of its use in a sample of individuals diagnosed with personality disorder who completed daily diaries over 100 consecutive days. Public Significance StatementAmbulatory assessment techniques (e.g., ecological momentary assessment) generate information that can be used to develop personalized models of an individual's behavior. Techniques are presented that allow for the simultaneous development of many personalized models and searches for shared features across models.

There is an ongoing debate regarding the nature of narcissism such that some argue that narcissistic individuals oscillate between grandiose and vulnerable states, whereas others argue these dimensions are stable traits (e.g., grandiose individuals remain in grandiose states). Scales sensitive to fluctuations in narcissistic states are necessary to address this question. The current study (N = 1,613 across three samples) validates the newly developed Narcissistic Vulnerability Scale (NVS), a brief (11-item) adjective-based measure of vulnerable narcissism. Expert ratings were used for item selection. The NVS's factor structure was evaluated along with its correlations with measures of grandiose and vulnerable narcissism, five-factor model traits, and self-esteem. A subset of NVS items were also evaluated using an ecological momentary assessment design. Results indicate the NVS is a unidimensional measure of vulnerable narcissism that could be used in either trait-oriented or state-oriented analyses, the latter of which may be particularly well suited to answering the most pressing questions in the study of narcissism. (PsycINFO Database Record