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The relationships between momentary psychotic-like experiences (MPLEs) and HEXACO complemented either by Disintegration (D) - a recently developed construct, capturing psychosis proneness as a personality trait (Knezevic, Savic, Kutlesic, and Opacic, 2017) - or PID-5 Psychoticism (Krueger et al., 2012) were investigated in a prospective study. The design of the study included experience sampling methodology (ESM) using the smart-phone app. A sample of 180 participants completed a) a nine-item questionnaire assessing MPLEs, b) a set of questions about a social company, and c) affective states they experienced in the last two-hours twice per day, with randomly chosen assessment time-points, during seven days (variables at the level 1 of multilevel modeling). Participants completed HEXACO inventory assessing six basic personality traits, and DELTA questionnaire assessing D trait (variables at level 2) one month prior to ESM. MPLEs as probably the most reliable, straightforward, and valid (i.e., not distorted by retrospective recall biases) experiential/behavioral indices of psychotic phenotype seem to have a meaning similar to dispositional measures of PLEs in personality inventories. Namely, the domain of PLEs was shown to be the only consistent prospective dispositional predictor of this set of broadly sampled momentary experiences/behaviors. The predictive power of the other traits to MPLEs is found to be small and unsystematic, i.e., conspicuously weak and sporadic in comparison to Disintegration to consider them major dispositional sources of these experiences/behaviors. Importantly, PID-5 P was also demonstrated to be a better prospective predictor of the MPLEs than HEXACO traits. Having in mind that MPLEs in this study were selected to parallel subdimensions of the Disintegration factor - which is considerably broader than PID-5 P - these findings were interpreted as indicating a probability that some important aspects of the domain of PLEs were neglected by the Psychoticism factor as conceptualized in PID-5 model. MPLEs in a sample of university students were found to be rare, but not exceptionally rare: the frequency and skewness of their distributions were similar to the skewness of the distributions of negative emotional states. The repercussions of the findings on the validity of the Disintegration scale/construct and taxonomy of the basic personality traits are discussed.
