I was watching this masterpiece Memento, but one question that stuck in my mind is how does Leonard remember reading and writing? He was suffering from short term memory loss and if reading and writing was in his permanent memory then why didn't he remember his name? His name must be in permanent memory too.

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    Technically, he did not lose his memory; he lost the ability to form new memories.
    – chepner
    Commented Feb 25, 2019 at 21:22
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    @chepner: Technically nothing, that is the answer to the question.
    – Kevin
    Commented Feb 25, 2019 at 23:33
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    @Kevin How does the inability to form new memories effect forgetting one's name?
    – Kevin
    Commented Feb 27, 2019 at 14:44
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    Mfw @Kevin forgot he was the one that said that and is actually living out the plot of Memento as we speak.
    – ocket8888
    Commented Feb 28, 2019 at 7:16
  • @Kevin: It doesn't. That's why he doesn't forget his name.
    – Kevin
    Commented Feb 28, 2019 at 18:39

4 Answers 4


Remembering skills is different from remembering facts, and memory is very complex.

Forgetting your name is different from forgetting language. For example someone suffering from amnesia might forget whether they like the taste of an apple, but they know what an apple is.

If you argue that Leonard would forget reading and writing because he learned those skills a long time ago, why wouldn't he forget all language, including spoken? Wouldn't he regress to the mental state of a baby? No. His memory of events and facts is different from his understanding of language.

For more reading, see this article on language memory and amnesiacs.

Besides, as others have pointed out, he can actually remember everything from before a certain point, so the premise of the question is flawed. That said you can't make hard rules about memory and say it's a 'plot mistake' if they are broken. Memory is complex.

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    I feel like an in-story answer would be better. Commented Feb 25, 2019 at 22:09
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    And in fact, this was significant plot point: a person with the main character's condition can subconsciously associate particular shapes with being shocked, even if they don't form conscious memories of being shocked. Commented Feb 25, 2019 at 23:28
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    This is incorrect. He remembers everything before the incident, including his name.
    – MooseBoys
    Commented Feb 25, 2019 at 23:28
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    @MooseBoys ... I was answering a question that asked why he could not read if he could not remember his name. The general point stands however - you cant make simplistic rules about memory. I've edited my answer to make that point.
    – iandotkelly
    Commented Feb 26, 2019 at 0:09
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    @iandotkelly That's like answering the question "Why did Challenger explode if there was no mechanical failure?" and then answering "Because rockets are complicated." (For those not familiar, the Challenger disaster was infamously attributed to an o-ring failure).
    – MooseBoys
    Commented Feb 26, 2019 at 16:46

This question is built on a false premise. At no point does Leonard forget his own name. One of the first lines spoken is Teddy calling him “Lenny”, to which Leonard responds “it’s Leonard”:

(Ignore the weird doodle).

All he forgets are events that happened after his attack.

  • Woa, I had not noticed how important that one line of dialogue is.
    – Almo
    Commented Feb 28, 2019 at 15:17

He says it himself several times in the movie: "I can't form new memories." His condition doesn't cause him to forget what happened before his brain was damaged, it only prevents him from forming new memories.


The injury suffered by the main character of Memento was inspired by the real-life case of Henry Molaison, aka H.M.,1 who lost the ability to form new memories (anterograde2 amnesia) as an unexpected side effect of brain surgery.3 A great deal of what we know about the brain, memories, and amnesia are a result of the H.M. case; his tragedy is the only reason that science was able to determine a lot of things about human memory.

In particular, case studies of H.M. cemented the distinction between explicit memories and implicit or procedural memories—that is, memories of events that have occurred in our lifetimes, versus memories of how to perform particular tasks. Not only did H.M. not forget how to do things he had learned, he was able to learn how to do new things, despite having no memory of having learned them. He learned to touch-type: if you showed him a typewriter or keyboard, he would claim to have never seen one in his life, but he could sit down and type with ease. He learned several artistic skills he had never had before the accident. He could even draw you a map of the house he lived in, despite having moved into it several years after he stopped producing personal memories and having no memory of having lived there before.

In this regard, Memento is actually quite accurate.4 Leonard not only could remember how to do things before his injury, but could even learn how to do new things, and even though he wouldn’t remember learning them, he’d still be able to do them.

  1. See How the man who inspired ‘Memento’ changed our understanding of memory in The Verge, The Man Who Forgot Everything from The New Yorker, etc. I haven’t found an explicit statement from Nolan or others involved in the movie referencing H.M., but many sources assert it. Others state only that the cases seem reminiscent of one another, etc.

  2. As opposed to retrograde, which in the case of amnesia refers to the loss of old memories. Henry Molaison actually also suffered some retrograde amnesia, losing the memories of a couple of years prior to the surgery. While that would be a devastating side effect in most cases, here it pales in comparison to the anterograde amnesia.

  3. The surgery was an effort to cure his extremely severe epilepsy, and it was actually successful in that.

  4. Which is not to say that Memento is a particularly accurate film overall; it is, in fact, a heavily stylized film. One notable departure from reality: another famous amnesiac, Clive Wearing, refused to believe he had written notes or journal entries, despite them being in his handwriting and him being informed of his condition, on the basis that he did not remember writing them and therefore could not believe that he had. He kept writing in his journal, despite believing all of the previous entries to be fabrications. It is therefore unclear if Leonard’s notes and tattoos trick would ever work.

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    If an episode of Castle has their science right (as explained by Phil LaMarr's psychiatrist character), procedural memory is a separate thing from episodic memory. (In this case, the amnesiac couldn't remember any events before the incident, but was able to sign his name when asked. So retrograde, rather than ante.) Gotta love Castle for accurate fun-fact infodumps, for the benefit of us curious audience members. :) But anyway, touch typing is a new procedural memory for H.M. Commented Feb 28, 2019 at 7:31
  • I'd guess that Clive Wearing's refusal to believe his own notes could go either way in different patients. It might just come down to aspects of personality and whether you can think through the consequences of having had amnesia for some time before you forget, maybe not anything inherent in the condition. That's a very interesting case, but I don't think I'd ding the movie for that specifically. Commented Feb 28, 2019 at 7:36
  • @PeterCordes Not a ding! Memento is a great movie in part because of its departures from reality and the way it can use that to get you thinking about reality. But sure, we have very few cases like this so it’s hard to say what is common to these ailments and what are unique to one person. (Also yes, episodic is another—maybe more common—term for personal memories.)
    – KRyan
    Commented Feb 28, 2019 at 12:39
  • @PeterCordes Double-checking, Wikipedia lists the distinction as explicit vs. implicit, where explicit covers not only episode/personal memories, but also semantic/factual memories. Implicit memories seem to be synonymous with procedural memories, though some statements leave room for unnamed non-procedural memories to exist that are also implicit.
    – KRyan
    Commented Feb 28, 2019 at 14:36

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