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Multiple Personality: An Experimental Investigation Into The Nature Of Human Individuality

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Multiple An Experimental Investigation Into The Nature Of Human Individuality is a book written by Boris Sidis in 1919. The book explores the concept of multiple personality disorder, a condition in which an individual exhibits two or more distinct personalities or identities, each with its own set of behaviors, thoughts, and emotions. Sidis, a renowned psychologist and philosopher, conducted extensive research on the subject of multiple personality disorder, using case studies and experimental data to support his theories. He believed that the condition was a result of trauma or abuse in childhood, which caused the individual to dissociate from their true identity and create multiple personalities as a coping mechanism. The book also delves into the philosophical implications of multiple personality disorder, questioning the nature of human individuality and the concept of a unified self. Sidis argues that the existence of multiple personalities challenges traditional notions of identity and raises profound questions about the nature of consciousness and the self. Overall, Multiple Personality is a groundbreaking work in the field of psychology and a thought-provoking exploration of the human psyche. It remains a significant contribution to the study of multiple personality disorder and continues to influence contemporary research in the field.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.

472 pages, Hardcover

First published June 1, 2008

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About the author

Boris Sidis

84 books14 followers
1867-1923
Boris Sidis was a Ukrainian-American psychologist, physician, psychiatrist, and philosopher of education. Sidis founded the New York State Psychopathic Institute and the Journal of Abnormal Psychology. He was the father of child prodigy William James Sidis. Boris Sidis eventually opposed mainstream psychology and Sigmund Freud, and thereby died ostracized. He was married to a maternal aunt of Clifton Fadiman, the noted American intellectual.

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Profile Image for Sarah S. AbuSarah.
35 reviews9 followers
January 2, 2026
كتاب رائع شرح عن أن العقل البشري ليس كتلة واحدة صلبة، بل شبكة من دوائر عصبية مترابطة وظيفيًا لا عضويًا، تعمل كل منها لتأدية وظيفة نفسية محددة.

في الإنسان الطبيعي، تكون هذه الشبكة متكاملة؛
الذاكرة، المشاعر، الهوية والوعي تعمل ضمن نظام واحد.

أما في اضطراب تعدد الشخصيات (DID)، وغالبًا نتيجة صدمات شديدة ومبكرة، يعجز العقل عن تحمّل الألم كخبرة واحدة، فيلجأ إلى الانفصال كآلية دفاع.
فتنفصل بعض الدوائر العصبية وظيفيًا وتعمل كنُظم شبه مستقلة، لكل منها وعيها وذاكرتها وهويتها الخاصة.

يشرح سيديس أن هذه الحالات تكون مدفونة في الوعي الباطني، وأن الانتقال بينها يحدث تدريجيًا، وقد شكّل التنويم المغناطيسي في زمنه إحدى محاولات العلاج لإعادة التواصل بينها واسترجاع الهوية الأولية
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