Inspired by the work of Fonagy (2008) and Dent and Christian (2019), this study applies a form of quantitative textual analysis to 300 terms of psychoanalytic interest in the PEP archives by tracking their historical prevalence in five-year increments using the aggregate number of articles featuring each term in the field's journals. Our results confirm some of the more well-known inflection points in the history and application of psychoanalytic theory, while also revealing some intriguing surprises. Psychoanalysis remains fundamentally a depth psychology, yet it has increasingly acknowledged the external causes of distress and trauma. Changes in the prevalence of terminology around psychopathology, defense mechanisms, development, gender and sexuality, and psychoanalytic technique are discussed.