Pierre Janet's L'Automatisme psychologique, originally published in 1889, is one of the earliest and most important books written on the study of trauma and dissociation. Here it is made available, in two volumes, in English for the first time, with a new preface by Giuseppe Craparo and Onno van der Hart.

Pierre Janet (1859-1947) is regarded as one of the most seminal researchers, clinicians, and thinkers of the last two centuries. His work spanned the fields of psychotherapy, psychology, and philosophy.

Giuseppe Craparo, PhD, is a psychologist, psychoanalyst, and Associate Professor of clinical psychology at the Kore University of Enna, Italy.

Onno van der Hart, PhD, is a psychologist, former psychotherapist, and Emeritus Professor at Utrecht University, the Netherlands.

Preface to the English edition; Acknowledgments; 1. Subconscious acts; 2. Anesthesias and simultaneous psychological existences; 3. Various forms of psychological disaggregation; 4. Mental weakness and strength; Conclusion; Appendix; Index