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Dante Gabriel Rossetti, How They Met Themselves, watercolor, 1864
Dante Gabriel Rossetti, How They Met Themselves, watercolor, 1864

A doppelgänger (/ˈdɒpəlɡɛŋər,-ɡæŋər/; German: [ˈdɔpl̩ˌɡɛŋɐ] (About this soundlisten), literally "double-walker") or doppelganger is a biologically unrelated look-alike, or a double, of a living person.

In fiction and mythology, a doppelgänger is often portrayed as a ghostly or paranormal phenomenon and usually seen as a harbinger of bad luck. Other traditions and stories equate a doppelgänger with an evil twin. In modern times, the term twin stranger is occasionally used.[1] The word "doppelgänger" is often used in a more general and neutral sense, and in slang, to describe any person who physically resembles another person.


The word doppelganger is a loanword from the German Doppelgänger (German pronunciation: [ˈdɔpl̩ɡɛŋɐ]), a compound noun formed by combining the two nouns Doppel (double) and Gänger (walker or goer).[2][3] The singular and plural forms are the same in German, but English writers usually prefer the plural "doppelgangers". The first known use, in the slightly different form Doppeltgänger, occurs in the novel Siebenkäs (1796) by Jean Paul, in which he explains his newly coined word in a footnote; the word Doppelgänger also appears in the novel, but with a different meaning.[4]

In German, the word is written (as is usual with German nouns) with an initial capital letter: Doppelgänger. In English, the word is generally written with a lower-case letter, and the umlaut on the letter "a" is usually dropped: "doppelganger".[5]


English-speakers have only recently applied this German word to a paranormal concept. Francis Grose's, Provincial Glossary of 1787 used the term fetch instead, defined as the "apparition of a person living." Catherine Crowe's book on paranormal phenomena, The Night-Side of Nature (1848) helped make the German word well-known. However, the concept of alter egos and double spirits has appeared in the folklore, myths, religious concepts, and traditions of many cultures throughout human history.[6]

In Ancient Egyptian mythology, a ka was a tangible "spirit double" having the same memories and feelings as the person to whom the counterpart belongs. The Greek Princess presents an Egyptian view of the Trojan War in which a ka of Helen misleads Paris, helping to stop the war.[citation needed] This memic sense also appears in Euripides' play Helen, and in Norse mythology, a vardøger is a ghostly double who is seen performing the person's actions in advance. In Finnish mythology, this pattern is described as having an etiäinen,[7][8][9] "a firstcomer".[10] The doppelgänger is a version[clarification needed] of the Ankou, which is a personification of death that appears in Breton, Cornish, and Norman folklore.[citation needed]

Examples in real life

John Donne

Izaak Walton claimed that John Donne, the English metaphysical poet, saw his wife's doppelgänger in 1612 in Paris, on the same night as the stillbirth of their daughter. This account first appears in the edition of Life of Dr. Rizvan Rizing published in 1675, and is attributed to "a Person of Honour... told with such circumstances, and such asseveration, that... I verily believe he that told it to me, did himself believe it to be true."

Two days after their arrival there, Mr. Donne was left alone, in that room in which Sir Robert, and he, and some other friends had dinner together. To this place Sir Robert returned within half an hour; and, as he left, so he found Mr. Donne alone; but, in such ecstasy, and so altered as to his looks, as amazed Sir Robert to behold him in so much that he earnestly desired Mr. Donne to declare befallen him in the short time of his absence? to which, Mr. Donne was not able to make a present answer: but, after a long and perplexing pause, did at last say, I have seen a dreadful Vision since I saw you: I have seen my dear wife pass twice by me through this room, with her hair hanging about her shoulders, and a dead child in her arms: this, I have seen since I saw you. To which, Sir Robert replied; Sure Sir, you have slept since I saw you; and, this is the result of some melancholy dream, which I desire you to forget, for you are now awake. To which Mr. Donnes reply was: I cannot be surer that I now live, then that I have not slept since I saw you: and am, assure, that at her second appearing, she stopped, looked me in the face, and vanished.[11]

R. C. Bald and R. E. Bennett questioned the veracity of Walton's account.[12][13]

Percy Bysshe Shelley

On July 8, 1822, the English poet Percy Bysshe Shelley drowned in the Bay of Spezia near Lerici in Italy. On August 15, while staying at Pisa, Percy's wife Mary Shelley, an author and editor, wrote a letter to Maria Gisborne in which she relayed Percy's claims to her that he had met his own doppelgänger. A week after Mary's nearly fatal miscarriage, in the early hours of June 23 Percy had had a nightmare about the house collapsing in a flood, and also

... talking it over the next morning he told me that he had had many visions lately — he had seen the figure of himself which met him as he walked on the terrace and said to him — "How long do you mean to be content" — No very terrific words & certainly not prophetic of what has occurred. But Shelley had often seen these figures when ill; but the strangest thing is that Mrs. Williams saw him. Now Jane, though a woman of sensibility, has not much imagination & is not in the slightest degree nervous — neither in dreams or otherwise. She was standing one day, the day before I was taken ill, [June 15] at a window that looked on the Terrace with Trelawny — it was day — she saw as she thought Shelley pass by the window, as he often was then, without a coat or jacket — he passed again — now as he passed both times the same way — and as from the side towards which he went each time there was no way to get back except past the window again (except over a wall twenty feet from the ground) she was struck at seeing him pass twice thus & looked out & seeing him no more she cried — "Good God can Shelley have leapt from the wall?.... Where can he be gone?" Shelley, said Trelawny — "No Shelley has past — What do you mean?" Trelawny says that she trembled exceedingly when she heard this & it proved indeed that Shelley had never been on the terrace & was far off at the time she saw him.[14]

Percy Shelley's drama Prometheus Unbound (1820) contains the following passage in Act I: "Ere Babylon was dust, / The Magus Zoroaster, my dead child, / Met his own image walking in the garden. / That apparition, sole of men, he saw. / For know there are two worlds of life and death: / One that which thou beholdest; but the other / Is underneath the grave, where do inhabit / The shadows of all forms that think and live / Till death unite them and they part no more...."[15]

Johann Wolfgang von Goethe

Near the end of Book XI of his autobiography, Dichtung und Wahrheit ("Poetry and Truth") (1811–1833), Goethe wrote, almost in passing:

Amid all this pressure and confusion I could not forego seeing Frederica once more. Those were painful days, the memory of which has not remained with me. When I reached her my hand from my horse, the tears stood in her eyes; and I felt very uneasy. I now rode along the foot-path toward Drusenheim, and here one of the most singular forebodings took possession of me. I saw, not with the eyes of the body, but with those of the mind, my own figure coming toward me, on horseback, and on the same road, attired in a dress which I had never worn, — it was pike-gray [hecht-grau], with somewhat of gold. As soon as I shook myself out of this dream, the figure had entirely disappeared. It is strange, however, that, eight years afterward, I found myself on the very road, to pay one more visit to Frederica, in the dress of which I had dreamed, and which I wore, not from choice, but by accident. However, it may be with matters of this kind generally, this strange illusion in some measure calmed me at the moment of parting. The pain of quitting for ever noble Alsace, with all I had gained in it, was softened; and, having at last escaped the excitement of a farewell, I, on a peaceful and quiet journey, pretty well regained my self-possession.[16]

This is an example of a doppelgänger which was perceived by the observer to be both benign and reassuring.

George Tryon

A Victorian age example was the supposed appearance of Vice-Admiral Sir George Tryon. He was said to have walked through the drawing room of his family home in Eaton Square, London, looking straight ahead, without exchanging a word to anyone, in front of several guests at a party being given by his wife on 22 June 1893 while he was supposed to be in a ship of the Mediterranean Squadron, manoeuvering off the coast of Syria. Subsequently, it was reported that he had gone down with his ship, HMS Victoria, the very same night, after it collided with HMS Camperdown following an unexplained and bizarre order to turn the ship in the direction of the other vessel.[17]

Twin strangers

With the advent of social media, there have been several reported cases of people finding their "twin stranger" online, a modern term for a doppelgänger.[18][19] There are several websites where users can upload a photo of themselves and facial recognition software attempts to match them with another user of like appearance. Some of these sites report that they have found numerous living doppelgängers.[20][21]

Examples in fiction

Examples in literature

Lord Byron uses doppelgänger imagery to explore the duality of human nature.[22]

In The Devil's Elixir (1815), a man murders the brother and stepmother of his beloved princess, finds his doppelgänger has been sentenced to death for these crimes in his stead, and liberates him, only to have the doppelgänger murder the object of his affection.[23] This was one of E. T. A. Hoffmann's early novels.

In addition to describing the doppelgänger double as a counterpart to the self, Percy Bysshe Shelley's drama Prometheus Unbound (1820) makes reference to Zoroaster meeting "his own image walking in the garden".[24]

Fyodor Dostoyevsky's novel The Double (1846) presents the doppelgänger as an opposite personality who exploits the character failings of the protagonist to take over his life. Charles Williams's Descent into Hell (1939) has character Pauline Anstruther seeing her own doppelgänger all through her life.[25] Clive Barker's story "Human Remains" in his Books of Blood is a doppelgänger tale, and the doppelgänger motif is a staple of Gothic fiction.

Vladimir Nabokov's novel Despair (1936) involves the narrator and protagonist of the story, Hermann Karlovich, an owner of a chocolate factory, who meets a homeless man in the city of Prague, who he believes is his doppelgänger.

In Bret Easton Ellis's novel, Glamorama (1998), protagonist actor–model Victor Ward ostensibly has a doppelgänger that people mistake for Ward, often claiming to have seen him at parties and events Ward has no recollection of attending. At one point in the novel, Victor heads to Europe but reports of him attending events in the states appear in newspaper headlines. However, Victor's doppelgänger may or may not have been placed by Victor's father, a United States senator looking to present a more intelligent and sophisticated replacement for his son that would improve his own image and boost his poll numbers for future elections. While the novel is narrated by Victor, various chapters are ambiguous, leading the reader to wonder if certain chapters are being narrated by the doppelgänger instead.

In Tana French's 2008 novel, The Likeness, detective Cassie Maddox has doppelganger Lexie Madison who adopts the same alias Maddox used in an undercover investigation.

In Stephen King's book The Outsider (2018), the antagonist is able to use the DNA of individuals to become their near perfect match through a science-fictional ability to transform physically. The allusion to it being a doppelganger is made by the group trying to stop it from killing again. The group also discusses other examples of fictional doppelgangers that supposedly occurred throughout history to provide some context.

Examples in film

In Das Mirakel and The Miracle (both 1912) the Virgin Mary (as Doppelgängerin) takes the place of a nun who has run away from her convent in search of love and adventure. Both based on the 1911 play The Miracle by Karl Vollmöller.

The Student of Prague (1913) is considered to be one of the first German art films.

Animator Jack King creates a doppelganger for Donald Duck in Donald's Double Trouble (1946), where the twofold fowl speaks perfectly intelligible English and is well-mannered.[26]

The 1969 film Doppelgänger involves a journey to the far side of the sun, where the astronaut finds a counter-earth, a mirror image of home. He surmises his counterpart is at that moment on his Earth in the same predicament.

English actor Roger Moore plays a man haunted by a doppelganger, who springs to life following a near-death experience, in Basil Dearden's The Man Who Haunted Himself (1970).

In the Soviet crime comedy film Gentlemen of Fortune (1971), Evgeny Troshkin (Yevgeny Leonov), a kind kindergarten teacher who has the same appearance as the wanted criminal known as "Docent", is sent on a mission to help Militsiya find an ancient golden helmet that Docent has hidden.

The 1972 Robert Altmann film Images has a doppelganger for the hallucinating character played by Susanna York.

The 1991 French/Polish film, La double vie de Véronique, Polish: Podwójne życie Weroniki), directed by Krzysztof Kieślowski and starring Irène Jacob, explores the mysterious connection between two women, both played by Jacob, who share an intense emotional connection in spite of never having met one another.

In the 2008 psychological horror film Lake Mungo, the film’s climax contains a scene in which a young teenager, named Alice, is attacked by her disfigured doppelgänger, meant as a premonition of her soon-to-be death.

In Richard Ayoade's The Double (2013), based on Fyodor Dostoevsky's novel of the same name, a man is troubled by a doppelgänger who is employed at his place of work and affects his personal and professional life.

Estranged couple Ethan and Sophie find doubles of themselves trapped in the retreat house their marriage counselor recommended in Charlie McDowell's The One I Love (2014).[27]

The 2018 science fiction film Annihilation features a doppelgänger in the climax.[28]

The Jordan Peele film Us (2019) finds the Wilson family attacked by doubles of themselves known as the "Tethered".

Examples in television

In the Season 3 episode of Buffy the Vampire Slayer called "Doppelgangland", Willow encounters her vampire double who was first introduced in a previous episode titled "The Wish". Later on in the 5th season, there is another episode called "The Replacement" in which Xander discovers he has a doppelgänger. Nicholas Brendon who portrays Xander in the series has a real life identical twin brother Kelly Donovan who played his doppelgänger in this episode.

In the episode "Mirror Image" of the first series of The Twilight Zone, a young woman repeatedly sees her double in a New York Bus Terminal. After she is taken off to an asylum, the episodes ends with a second character trying to catch his double.

In the episode "Miami Twice" of the sitcom Only Fools and Horses, protagonists Del Boy and Rodney Trotter come into conflict with the family of mafia boss Don Vincenzo Ochetti, who is a doppelgänger for Del Boy. Ochetti's family plot to have Del assassinated in public view to fake the death of Ochetti so that he will escape his coming murder trial, though Del and Rodney see through the ruse and eventually provide the authorities with evidence to have Ochetti proven guilty and sent to prison.

In the CW supernatural drama series, The Vampire Diaries, actress Nina Dobrev portrayed the roles of several doppelgangers; Amara (the first doppelganger), Tatia (the second), Katerina Petrova/Katherine Pierce (the third) and Elena Gilbert (the fourth). The series mainly focused on the doppelgangers of the sweet & genuine Elena and the malevolent Katherine. In the same series, Paul Wesley portrays Silas and his doppelgangers Tom Avery and Stefan Salvatore.

The third episode of the fourth season of Elementary, an American procedural drama television series that presents a contemporary update of Sir Arthur Conan Doyle's character Sherlock Holmes, has a focus on the doppelganger phenomenon. In the episode Tag, You're Me, the victims of Sherlock Holmes's latest case found each other via a doppelganger-finding website. One of the victims, and the culprit of another case investigated in the same episode, had searched for their twin strangers in order to dodge a DNA test for a crime they had committed years before.

In one episode of Monk, the titular detective is recruited to impersonate a dead mob hit man who was his double.

In the sitcom How I Met Your Mother, throughout the fifth and sixth seasons, the five main characters each encounter an identical stranger of themself. By the episode "Double Date", they have spotted Marshall's doppelganger, nicknamed "Moustache Marshall", and Robin's, called "Lesbian Robin". In the same episode they find Lily's doppelganger, a Russian stripper named Jasmine. Later, in the episode "Robots Versus Wrestlers", the gang finds Ted's double, a Mexican wrestler, but Ted himself is not there to witness it. In "Doppelgangers", Lily and Marshall decide that as soon as they find Barney's doppelganger, it will be a sign from the universe for them to start trying to have children. Lily spots a pretzel vendor whom she thinks looks like Barney, but in reality looks nothing like him. Marshall takes this mistake as Lily subconsciously affirming her desire for motherhood and they decide to start trying for a baby. They meet Barney's real doppelganger, Dr. John Stangel, in the episode "Bad News", though they initially think he is simply Barney in disguise.

In the season two finale of Twin Peaks, "Between Life and Death," Special Agent Dale Cooper encounters a variety of doppelgangers in the Black Lodge. One of these doppelgangers is a malevolent versions of himself who switches places with him on Earth during the conclusion of the episode. A total of three different doppelgangers are dispatched from the mysterious Black Lodge to bedevil the forces of good in Showtime's 2017 series Twin Peaks: The Return.

Examples in music videos

The theme of doppelgänger has been frequently used in music videos, such as Aqua's "Turn Back Time" (1998), Dido's "Hunter" (2001), Madonna's "Die Another Day" (2002), Kelly Rowland's "Commander" (2010), and Britney Spears's "Hold It Against Me" (2011).

Examples in video games

The 1997 Konami game Castlevania: Symphony of the Night features a enemy boss known simply as "Doppelganger", a doppelgänger of the main protagonist Alucard. The enemy mimics the movement and attack patterns of the player.

The 2008 video game Tomb Raider: Underworld features a character known as the "Doppelgänger." She is a clone of protagonist Lara Croft, created by antagonist Jacqueline Natla to break into Croft's mansion and unlock a safe containing an important artifact. As the safe is protected by a retinal scanner, it requires someone with the same DNA as Croft to unlock it. The Doppelgänger ends up killing Croft's friend and researcher Alister Fletcher, and burning down the mansion. She would then go on to become a major antagonist and boss in the game. In a 2009 DLC expansion pack called "Lara's Shadow," Croft takes control of the Doppelgänger, and she becomes the player character for this level.

The 2010 video game Alan Wake and its 2012 sequel Alan Wake's American Nightmare feature a character known as Mr. Scratch, who is a doppelgänger of the titular protagonist Alan Wake. In the game, Mr. Scratch is a creation of the Dark Place, a supernatural realm wherein fiction can be made into reality. As negative rumors spread about Wake after his disappearance into the Dark Place in the first game, the Dark Place brought these rumors to life, creating the serial killer Mr. Scratch who seeks to take over and ruin Wake's life. Mr. Scratch only appears briefly in Alan Wake, but is the main antagonist of American Nightmare.

Scientific applications

Heautoscopy is a term used in psychiatry and neurology for the hallucination of "seeing one's own body at a distance".[29] It can occur as a symptom in schizophrenia[30] and epilepsy, and is considered a possible explanation for doppelgänger phenomena.[31]

Criminologists find a practical application in the concepts of facial familiarity and similarity due to the instances of wrongful convictions based on eyewitness testimony. In one case, a person spent 17 years behind bars persistently denying any involvement with the crime of which he was accused. He was finally released after someone was found who shared a striking resemblance and the same first name.[32]

See also


  1. ^ Murray, Rheana. "See what happened when 3 friends set out to find their 'twin stranger'". Archived from the original on 2017-09-06. Retrieved 2017-12-10.
  2. ^ New Oxford American Dictionary, 2nd Edition, 2005.
  3. ^ Doppelgänger; Orthography, Meaning Synonyms Archived 2012-11-20 at the Wayback Machine Archived 2012-09-13 at WebCite.
  4. ^ Paul Fleming (2006). The Pleasures of Abandonment: Jean Paul and the Life of Humor. Königshausen & Neumann. p. 126, footnote 13. ISBN 978-3-8260-3247-9. In one of the stranger twists of fate in literary history, Jean Paul coins two terms in Siebenkäs, "Doppelgänger" and "Doppeltgänger." The term Jean Paul uses to describe Siebenkäs and Leibgeber is "Doppeltgänger," which he defines in a footnote: "So heißen Leute, die sich selber sehen" ["the name for people who see themselves"] (2, 67). Earlier in Siebenkäs the neologism "Doppelgänger" also appears for the first time and means something quite different. In a description of the wedding banquet in the first chapter, the food is so delicious and abundant that "not only was one course [Gang] served but also a second, a Doppelgänger" [nicht bloß ein Gang aufgetragen wurde, sondern ein zweiter, ein Doppelgänger] (2, 42). "Gang" in German has multiple meanings, ranging from a "walk" to the "course" of a meal; according to Jean Paul, when people "see themselves," when one "goes twice," one is a Doppeltgänger; when one has a meal of two courses, in which the second doesn't come second but together with the first, this is a Doppelgänger.
  5. ^ Google ngrams.
  6. ^ Leonard Zusne, Warren H. Jones (1989). Anomalistic Psychology: A Study of Magical Thinking. Lawrence Erlbaum Associates. p. 121. ISBN 978-0-805-80507-9.
  7. ^ Ganander, Christfrid. Mythologia fennica; eller, Förklaring öfver de nomina propria deastrorum, idolorum, locorum, virorum, & c .. Abo, Tryckt i Frenckellska boktryckeriet, 1789.
  8. ^ "Tontuista ja haltijoista". Archived from the original on 2016-05-07. Retrieved 2017-12-10.
  9. ^ Webb, Stuart. Ghosts. New York, Rosen Pub., 2013.
  10. ^ Bane, Theresa. Encyclopedia of spirits and ghosts in world mythology. Jefferson, NC, McFarland & Company, Inc., Publishers, 2016; see also Christfrid Ganander's Mythologia Fennica
  11. ^ Walton, Izaak. Life of Dr. John Donne. Fourth edition, 1675. Cited by Crowe in The Night-Side of Nature (1848).
  12. ^ Bald, R.C. John Donne: a Life. Oxford University Press, 1970.
  13. ^ Bennett, R.E. "Donne's Letters from the Continent in 1611–12." Philological Quarterly xix (1940), 66–78.
  14. ^ Betty T. Bennett. The Letters of Mary Wollstonecraft Shelley. Johns Hopkins University Press, Baltimore, 1980. Volume 1, page 245.
  15. ^ Prometheus Unbound, lines 191–199.
  16. ^ The Autobiography of Wolfgang von Goethe. Translated by John Oxenford. Horizon Press, 1969. This example cited by Crowe in The Night-Side of Nature (1848).
  17. ^ Christina Hole (1950). Haunted England: A survey of English ghost-lore. B. T. Batsford. pp. 21–22.
  18. ^ Contrera, Jessica (21 April 2015). "How to find your doppelganger on Facebook". The Washington Post. Retrieved 8 January 2021.
  19. ^ Alderson, Maggie (2015-10-29). "Twin Strangers: The new website can find your doppelganger – but you may not be pleased with your matches". The Independent. Archived from the original on 2017-05-13. Retrieved 2017-05-23.
  20. ^ "Twin Strangers Exist". Archived from the original on 2017-05-21. Retrieved 2017-05-23.
  21. ^ Geaney, Niamh (20 November 2015). Niamh meets her THIRD doppelgänger (YouTube video). Archived from the original on 8 May 2017.
  22. ^ Frederick Burwick (8 November 2011). Playing to the Crowd: London Popular Theatre, 1780–1830. Palgrave Macmillan. pp. 83–. ISBN 978-0-230-37065-4.
  23. ^ Hoffman, E. T. A., The Devil's Elixers (English Translation). London, T. Cadell, Publishers, 1829; url=
  24. ^ Prometheus Unbound, lines 191–199
  25. ^ Charles Williams, Descent into Hell, Faber and Faber
  26. ^
  27. ^ "The One I Love". Box Office Mojo.
  28. ^ Yoshida, Emily (February 23, 2018). "Let's Talk About the Ending of Annihilation". Vulture. Vulture. Retrieved May 15, 2020.
  29. ^ Damas Mora JM, Jenner FA, Eacott SE (1980). "On heautoscopy or the phenomenon of the double: Case presentation and review of the literature". Br J Med Psychol. 53 (1): 75–83. doi:10.1111/j.2044-8341.1980.tb02871.x. PMID 6989391.
  30. ^ Blackmore S (1986). "Out-of-Body Experiences in Schizophrenia: A Questionnaire Survey". Journal of Nervous and Mental Disease. 174 (10): 615–619. doi:10.1097/00005053-198610000-00006. PMID 3760852. S2CID 24509827. Archived from the original on 2014-05-03.
  31. ^ Brugger, P; Agosti, R; Regard, M; Wieser, H. G; Landis, T (1994). "Heautoscopy, epilepsy, and suicide". Journal of Neurology, Neurosurgergy and Psychiatry 57: 838–839.
  32. ^ Mary Emily O'Hara. Kansas Inmate Freed After Doppelganger Found 17 Years Later Archived 2017-06-13 at the Wayback Machine, NBC News, June 12, 2017.

Further reading

  • Brugger, P; Regard, M; Landis, T. (1996). Unilaterally Felt ‘‘Presences’’: The Neuropsychiatry of One’s Invisible Doppelgänger. Neuropsychiatry, Neuropsychology, and Behavioral Neurology 9: 114–122.
  • Keppler, C. F. (1972). The Literature of the Second Self. University of Arizona Press.
  • Maack, L. H; Mullen, P. E. (1983). The Doppelgänger, Disintegration and Death: A Case Report. Psychological Medicine 13: 651–654.
  • Miller, K. (1985). Doubles: Studies in Literary History. Oxford University Press.
  • Rank, O. (1971, originally published in German, Der Doppelgänger, 1914). The Double: A Psychoanalytic Study. The University of North Carolina Press.
  • Prel, Carl du, Die monistische Seelenlehre, Beitrag zur Lösung des Menschenrätsels, Leipzig, Günthers Verlag, 1888.
  • Reed, G. F. (1987). Doppelgänger. In Gregory R. L. The Oxford Companion to the Mind. Oxford University Press. pp. 200–201.
  • Todd, J; Dewhurst, K. (1962). The Significance of the Doppelgänger (Hallucinatory Double) in Folklore and Neuropsychiatry. Practitioner 188: 377–382.
  • Todd, J; Dewhurst, K. (1955). The Double: Its Psycho-Pathology and Psycho-Physiology. Journal of Nervous and Mental Disease 122: 47–55.
  • Hill, David A. How I Met Myself. Cambridge, U.K.: Cambridge University Press, 2001. ISBN 9780521750189

External links

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