Human Brains Have Nearly Unlimited Storage

“We have all forgot more than we remember.” —Thomas Fuller, Gnomologia

In A Nutshell

When we learn new facts, we aren’t forced to “delete” old ones. That’s because our brains don’t work like hard drives or bookshelves. In fact, the memory space in our ol’ noggins is so large, that we can’t possibly hope to fill it within our lifetimes. It’s effectively unlimited. The brain is also not as broad a storage unit as a hard drive, as it has different ways of storing memories that help prioritize what’s important and what isn’t (and is unable to delete things at will).

The Whole Bushel

” ‘You appear to be astonished,’ he said, smiling at my expression of surprise. ‘Now that I do know it I shall do my best to forget it.’ ”

It’s perhaps one of the most famous interactions in the Sherlock Holmes franchise: Dr. John Watson, having just explained to Holmes that the Earth revolves around the Sun, is rebuffed by Holmes, who declares that it isn’t important.

Featured in A Study in Scarlet, by Sir Arthur Conan Doyle, Holmes declares that the human brain has a limited amount of space, like an attic, and shouldn’t be crowded with impractical facts. It’s an interesting idea, but it’s totally untrue.

The human brain is very different from an attic, or bookshelf, or, for a more modern analogy, a hard drive. Memories are not stored in a single place but are reconstructed from various areas in the brain. This enables the brain, more or less, to store an unlimited amount of information for an indefinite period of time. During the course of one lifetime, it would be impossible to fill the memory space of the human brain. Some have estimated that the brain is somewhere close to a million gigabytes.

Different types of memory include sensory memory, short-term memory, and long-term memory. When something has been moved into long-term memory, your brain will be more effective at remembering it. For example, you’d obviously be better at reciting a poem you’ve memorized instead of one you’ve just read.

What about the crowds of impractical facts? The brain has automatic mechanisms for prioritizing what’s important and what isn’t. The answer to the math question you solved on the third day of eighth grade probably wouldn’t be too easy to recall. Your first kiss, on the other hand, can probably be remembered instantly.

It’s impossible to delete a memory at will, but sometimes memories can be completely forgotten. Complete photographic memory is a bit of a myth, though there are people who have extreme recall abilities. But your brain prioritizes things for a reason: People with eidetic memory can have difficulty making it through a day because of all the information they have to sift through.

Show Me The Proof

The Human Memory: What It Is, How It Works, And How It Can Go Wrong
Scientific American: What Is the Memory Capacity of the Human Brain?
Psychology Today: The Truth About Photographic Memory

  • Once I’d learned the brain records everything you think, dream, see, hear, feel, read or smell, I stopped feeling melancholy and sad about the passing of time. There, I’ve said it.

    • P5ychoRaz

      Or typed it.

      Did it work?

  • edzyl blane

    I’ve heard before that our brains can contain enough memory to store 300 years worth of non-stop video.

    • Rupam Das

      Next time I’ll use a human brain to store all the videos in the hidden folder of my PC.

  • ThatShadyGuy

    When I was 15, I have learnt that your brain assess and store every information it receives, I have a kind of a illusion that I have two personality inside my head.
    There’s conscious, me. Everything I know and do with my own will is put under conscious. And then there’s subconscious. A state of mind beyond my control. (The mythical 90%, if you may.) Subconscious knows every thing that I have known. It sees everything, not just what I am focusing. Every single stimulation it receives, be it ocular, auditory or chemical, it knows and it is recorded. It remembers every single memory I have and can recall it perfectly. Yet, it keeps every thing to itself. Sharing none with my conscious.
    And then slowly, I realise…
    My subconscious is a bastard.

    • anam shah

      Subconscious mind is in control of the conscious and it probably functions actively when you sleep and inevitably when you are awake and it has also a unlimited memory capacity.
      It does Mark each and everything it is just that we don’t have that much time to spend and rigorously pull out each and every small detail

  • Spartachilles

    Warning: many comments will follow this structure:
    … Then why can I never remember ______
    Ex. Then why can I never remember that math problem?
    Then why can I never remember my anniversary?

    • Lisa 39

      I like this one 🙂

  • Andyman7714

    On top of that, it also makes up memories.

    • rincewind

      Oh, Yes. I once said that to my wife. It didn’t work…..

  • Hillyard

    Ah yes, my first kiss. She slapped the teeth out of my mouth and her brother beat the crap out of me. Still it was totally not worth it.

  • Redboy.apbt

    Sheldon has an eidetic memory on the big bang theory

    • gillybean

      My brother has that. It’s very freaky! And you NEVER get away with lying to him!

  • Redboy.apbt

    Okay queer

  • Altair

    You can never remember where your keys are, but that stupid thing you did at a party ten years ago still pops in to haunt you.

  • gillybean

    ‘The mind, once stretched by a new idea, never returns to its original dimensions.’
    – Ralph Waldo Emerson.
    This was on a poster in the school library when I was a kid. The idea of it always intrigued me, I suppose because the physical size of the brain doesn’t change, and yet the sum of its knowledge is ever expanding.

  • P5ychoRaz

    Just read an article about how scientists located the protein responsible for “forgetting” things. It was discovered to be an active process and was called musashi.

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