Exploring the Temporal Dynamics of the Interpersonal Theory of Suicide Constructs: A Dynamic Systems Modeling Approach

Abstract

Objective: The interpersonal theory of suicide has contributed to advances in the understanding and prevention of suicidal behavior, with over a decade of empirical examination. Few studies, however, have used a longitudinal design with repeated short-term follow-ups to examine the temporal trajectories of perceived burdensomeness, thwarted belongingness, and suicidal ideation, nor have any studies to our knowledge investigated the propositions of the interpersonal theory of suicide using a dynamic systems theory approach. The present study examined the temporal dynamics of perceived burdensomeness, thwarted belongingness, and suicidal ideation, as moderated by capability for suicide, using dynamic systems modeling analyses in a sample of 91 adults at high risk for suicide (Mage = 27.03 years, SD = 8.64; 53.8% female, 44.0% male, 1.1% nonbinary, 1.1% transgender female). Method: Participants completed brief online self-report measures at 6 time-points, each 3 days apart. Results: Results were generally in support of the interpersonal theory of suicide: perceived burdensomeness, thwarted belongingness, and suicidal ideation exhibited patterns of temporal stability that were accentuated at high levels of capability for suicide; perceived burdensomeness and thwarted belongingness exhibited a reciprocal temporal pattern, as did perceived burdensomeness and suicidal ideation. However, thwarted belongingness did not have an incremental influence on suicidal ideation. Conclusions: Overall, these findings provide additional information about the nature of suicidal ideation and interpersonal risk factors over time and point to nonlinear dynamic systems modeling as an analytic technique that may prove useful in understanding trajectories of suicidal thoughts and behaviors.