The many faces of narcissism: A question of situation perception?

• Person-situation dynamics in narcissism are investigated using a longitudinal experimental design. • Certain situation perceptions trigger momentary manifestations of specific narcissisism domains. • The trait structure of narcissism provides insights into whether the same or different situation perceptions lead to the acvation of specific narcissism domain states. • Momentary co-occurrences between situation perceptions and narcissistic states do not necessarily result in proximal or distal spillover effects. This study investigated the dynamic interplay between narcissistic states—narcissistic agency, antagonism, and vulnerability—and situation perceptions using the DIAMONDS framework. Participants ( N = 183) engaged in weekly online group discussions over six weeks, simulating the natural acquaintance process. Results showed significant co-occurrences: situation perceptions of Positivity related to heightened narcissistic agency, while Duty and Negativity perceptions were linked to narcissistic antagonism and vulnerability. Random-Intercept Cross-Lagged Panel Models revealed first causal relations, with situation perceptions often preceding changes in narcissistic states. For example, perceptions of Intellect and Positivity increased narcissistic agency, while Intellect, Duty, and Negativity triggered higher-than-usual narcissistic antagonism. Findings highlight the role of situation perceptions in shaping the momentray manifestations of narcissisism.