*Este artículo fue creado utilizando entrada de voz con IA (Aqua Voice). Tenga en cuenta que puede haber algunas inconsistencias.
When I Stopped “Memorizing,” AI Became My Partner — Introducing the Second Brain Strategy
Hola. ¿Cómo están todos?
Soy Hiro del Laboratorio de Full Body Tracking.
I have a sudden question for all of you.
Do you remember the idea you had yesterday?
Can you recall right now what you jotted down a week ago?
…I’m guessing most people would answer “no way.”
Same here. Human short-term memory disappears surprisingly fast.
But recently, I found a way to turn that from a “weakness” into a “weapon.”
That’s what I want to talk about today.
Forgetting Isn’t a Bad Thing
Humans have short-term memory and long-term memory.
Short-term memory really does fade fast. Something you thought of moments ago is gone in five minutes. An idea that popped into your head during a meeting — by the time you get home, it’s “wait, what was that again?”
Up until now, this was a problem. So people desperately took notes. Wrote in Notion. Wrote in Obsidian.
But do you actually go back and review those notes?
Honestly, I barely did. I’d write something, feel satisfied, and just leave it there. Piling up knowledge and letting it sit. I kept repeating that cycle.
Things you write in a notebook do get forgotten. But sometimes something triggers the thought “Oh, I wrote about that.” In other words, notes aren’t for remembering — they’re triggers for recalling.
So what if we could get better at “recalling”?
That’s where AI comes in.
It’s Fine to Forget. AI Remembers for You.
Here’s the cycle I’ve been using recently:
I speak -> AI stores it -> I forget -> When I need it, AI reminds me.
That’s it.
“Wait, that’s all?” you might think. But this is incredibly powerful.
The key point is “it’s fine to forget.”
Until now, I would take notes, organize them, categorize them, add tags, create links… This “organizing work” took an enormous amount of time.
But when you speak to AI and have it store things, your notes get organized automatically. They come together as structured data.
All you have to do is “output.” Leave the organizing to AI.
This is the concept of a Second Brain.
Speaking Is Overwhelmingly Faster
In the AI era, what becomes important is quick response and quick input.
And when it comes to speed of input, speaking is overwhelmingly faster than typing.
No matter how fast you type, you max out at about 100-200 characters per minute. But speaking, you can easily produce 300-400 characters per minute.
And on top of that, your mind is actively working while you’re speaking.
“Oh, this is connected to that.” “Come to think of it, that links to this other thing.”
These insights pop out one after another while speaking. Ideas that never emerged while writing are born the moment you vocalize them.
What I do is organize what I’m working on while talking about it.
I throw the insights that come to me while speaking directly to AI. AI receives them and organizes them into a coherent form.
What Digital Tools Are Bad At
Here’s one important point.
There are tons of knowledge management tools out there, like Obsidian and Notion.
These tools let you write down knowledge. But connecting one piece of knowledge to another — that’s something digital tools are remarkably bad at.
Notion might be a bit better since pages are visually laid out side by side. Obsidian has linking capabilities, but ultimately you have to decide for yourself “these two things are connected” and create the link manually.
You can place dots. But connecting the dots is a human job, not a tool’s job.
So how do you connect them?
By speaking.
While you’re talking, you notice “Oh, this connects to that other thing.” You convey that realization directly to AI. AI understands “I see, so this and this are related” and stores the connection along with the content.
Humans place the dots, notice the connections, and AI structures them. I think this division of labor works best.
But You Can’t Just Store Everything Indiscriminately
Here’s an important caveat.
You can’t just have AI memorize anything and everything.
You might think “Well, just memo everything and hand it all to AI.” But if you just pile up information, it creates indecision.
It’s the same for humans, right? If there are 100 documents on your desk, you don’t know which one to look at.
The important thing is not to use AI as “a convenient notepad that remembers everything,” but as “a tool for making decisions.”
Being able to pull the right information, at the right time, in the right form. That’s the essence of a Second Brain.
I talked about “harness engineering” in a previous article, and actually, this Second Brain strategy forms the foundation of the harness.
Knowledge stored through speaking to AI gets organized. Organized knowledge becomes the basis for AI’s decision-making. Because there’s a decision-making basis, AI can run in the right direction.
In other words: Second Brain -> Harness Engineering -> AI operates autonomously.
Once this flow is established, it becomes incredibly powerful.
How to Actually Do It
For those thinking “That sounds interesting, but how do you actually do it?” let me briefly summarize what I do.
Step 1: Speak
Things you’ve thought of, ideas, realizations — throw them at AI through voice. No need to organize. Just say what comes to mind.
Step 2: Have AI Organize It
AI summarizes what you’ve said. Makes bullet points, categorizes by theme. Organization that you’d never have done yourself just gets done automatically.
Step 3: Become Aware of Connections
If you realize “Oh, this is related to that” while speaking, say that too. “The thing I just said and this current topic are connected.” AI will understand the connection as part of the whole.
Step 4: Save to External Memory
Since AI’s context window has limits, save the organized content as MD files or other external memory. Obsidian, a text editor, whatever works. The key point is that you’re saving what AI organized, not organizing things yourself.
Step 5: Pull It Out When Needed
When you forget, ask AI. “I think I talked about something like this before.” AI pulls it from saved memory.
Resumen: Don’t Be Afraid of Forgetting
In the old days, “memorizing” was what mattered.
Cramming for a good university. Loading up on knowledge needed for work. Taking notes so you don’t forget.
But the AI era is different.
Rather than memorizing, building a system for recalling is more important.
You don’t have to hold everything in your own head. It’s fine to forget. Instead, deposit it in AI as your “second brain.”
When you need something, you can pull it out immediately.
This is the Second Brain strategy.
I’m a full-body tracking researcher, and full-body tracking is actually a technology where you “deposit your body’s movements into external sensors.” You can’t move in the virtual world with just your body. But by depositing your movements into sensors, your avatar moves on your behalf.
Memory is the same. You can’t remember everything with just your brain. But by depositing it with AI, you can recall it when you need to.
Don’t be afraid of forgetting. Keep talking, keep depositing.
I think that’s the new way of relating to knowledge in the AI era.
I hope all of you will start by trying to just talk to AI about whatever comes to mind.
Hiro
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