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People with late-stage Alzheimer’s disease and related dementias (ADRD) have been reported, largely by way of anecdote, to exhibit unexpected episodes of spontaneous, meaningful, and relevant communication or behavior. These episodes of lucidity (EL) are characterized by spontaneous mental clarity in people living with dementia (PLWD) who are assumed to have lost coherent cognitive capacity. Given the transient nature and limited understanding of underlying mechanisms responsible for this phenomenon, these episodes are frequently overlooked and have received little scientific attention. Few studies have documented EL among PLWD with precision; scientific understanding is limited to anecdotes and case studies, which have not operationalized EL. Thus, there is a critical need for an evidence-based understanding and systematic operationalization of EL. Precise and robust operationalizations …