The idea of a false "implanted memory". 
Miguel de Cervantes, Don Quijote, 2ª parte, p.709: Don Quijote has decided to explore the Caves of Montesinos. A rope is tied around him, Sancho Panza and another person stay above holding the other end, and he descends. After half an hour, they pull on the rope and Don Quijote comes out like a sleepwalker. Awakened, he says that he has spent three days in the cave among the spirits of enchanted heros and heroines. They discuss the discrepancy of time :

- Yo no creo que mi señor miente - respondió Sancho.

- Si no, ¿qué crees? - le preguntó don Quijote.

- Creo - respondió Sancho - que aquel Merlín o aquellos encantadores que encantaron a toda la chusma que vuestra merced dice que ha visto y comunicado allá bajo, le encajaron en el magín o la memoria toda esta máquina que nos ha contado, y todo aquello que por contar le queda.

- Todo eso pudiera ser, Sancho - replicó don Quijote -, pero no es así; porque lo que he contado lo vi por mis propios ojos y lo toqué con mis mismas manos. ...

"I don't believe that my lord is lying," answered Sancho.

"If not, what do you believe?" don Quijote asked him.

"I believe," answered Sancho, "that that Merlin, or those enchanters who enchanted that whole mob that your honor says he saw and communicated with down there, put into your imagination or your memory all that business you've told us, as well as all that you have left to tell."

"That could well happen, Sancho," replied don Quijote, "but it isn't so, for what I have described I saw with my own eyes and touched with my very hands. ..."

(My translation.)

In the copy I have, published by Editorial Juventud, 1955, Barcelona, the visit to the cave takes place on pp.700-701, near the end of Chapter XXII, Book 2, and the above conversation takes place on p.709, in Chapter XXIII. (I don't know how the book is divided in English translations. One time when I tried to compare the quotations from Don Quijote in Bartlett's Familiar Quotations with the original, I couldn't find any of them in my copy using the chapter-references shown in Bartlett's.)

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