The data from the first sample of participants (i.e., the Prolific daily diary study) have not been presented previously. Data from select measures from the other two samples (i.e., data from Prolific participants from two assessments approximately 2 weeks apart; cross-sectional data from undergraduates) have been published in one previous manuscript (see for more information: https://osf.io/bcavr/). However, all analyses presented are original and the scope of the current manuscript is distinct from any prior research. Data presented in the manuscript and data analytic syntax are available on the Open Science Framework website: https://osf.io/x37ej/

We examined hierarchical structural models of psychopathology in samples of (a) adults recruited online and screened based on psychopathology history ( N = 429) and (b) undergraduates ( N = 529) to inform classification of neurodevelopmental disorder (NDD)- and hypomania-relevant dimensions within the Hierarchical Taxonomy of Psychopathology (HiTOP). Results differed across samples in some ways, but converged to indicate that some NDD- and hypomania-relevant dimensions aligned closely with different HiTOP spectra. For example, some hypomania-relevant dimensions (e.g., affective lability) overlapped strongly with the internalizing spectrum, whereas others (e.g., self-perceived charisma) were reverse-indicators of detachment. Examination of cross-sectional and prospective correlates for emergent factors also was informative in some ways. This included NDD-relevant and disinhibited externalizing dimensions associating robustly with treatment seeking history and recent experiences of distress. These results provide initial insights into classifying NDD- and hypomania-relevant dimensions within the HiTOP and indicate a need for future research in this area.

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