The Effectiveness of Long-Term Psychoanalytic Therapy: A Systematic Review of Empirical Studies

The Evidence for the Couch

De Maat and colleagues’ 2009 systematic review, published in the Harvard Review of Psychiatry, provides the most comprehensive assessment to date of long-term psychoanalytic therapy in its classical form — not the modified, once-weekly psychodynamic treatments that dominate the contemporary literature, but the intensive, multi-session-per-week analytic process that Freud inaugurated and that the Jungian tradition adapted to its own purposes. The review encompasses 27 studies, most employing naturalistic or quasi-experimental designs, and reports large pre-post effect sizes for both symptom reduction (Cohen’s d = 0.78–1.46) and personality functioning (d = 0.78–1.18). The numbers are robust and consistent: long-term psychoanalytic treatment produces substantial clinical improvement across a wide range of conditions.

Frequency Matters: The Dose-Response Argument

The review’s most provocative finding is the dose-response relationship between session frequency and outcome. Studies of psychoanalysis proper — three to five sessions per week — show larger effects than studies of once-weekly psychoanalytic psychotherapy. This finding has direct implications for training and practice. The managed-care model, which reimburses once-weekly sessions for limited durations, is not merely economically constrained but therapeutically insufficient for the patients who most need intensive work. The depth tradition has always known this intuitively: the unconscious speaks in its own time, and the more frequently the ego turns toward it — through dream work, active imagination, transference analysis, and the sustained presence of the therapeutic relationship — the more fully it reveals what needs to be seen. De Maat’s data translate this clinical wisdom into the language of dose-response curves and effect sizes.

The Self-Sustaining Transformation

Perhaps the review’s most significant finding is the stability of treatment gains at long-term follow-up. Multiple studies reported that patients not only maintained their improvements years after termination but continued to improve — showing larger effect sizes at follow-up than at the end of treatment. This pattern, which Shedler independently confirmed in his 2010 meta-analysis, is the empirical signature of what depth psychology calls individuation: a self-perpetuating process of psychological development that, once initiated through analytic work, continues under its own momentum. The analyst does not cure the patient; the analyst helps the patient establish a relationship with the unconscious that becomes self-sustaining. The ego learns to listen, to metabolize, to integrate — and once this capacity is internalized, the therapeutic function continues without the therapist.

Classical Analysis in the Modern World

De Maat’s review serves as a corrective to the institutional narrative that classical psychoanalytic treatment is an anachronism — an expensive, time-consuming relic of a pre-empirical era. The data tell a different story. For complex psychological conditions that resist brief interventions, long-term intensive analysis produces outcomes that justify its duration, its frequency, and its cost. The depth psychological tradition — whether Freudian, Jungian, or relational — rests on the premise that the psyche has depths that require time to reach and that the relationship between analyst and analysand is the medium through which those depths become accessible. De Maat’s systematic review confirms that this premise, far from being a therapeutic luxury, produces measurable, durable, and self-sustaining clinical results.