Cognitive offloading is the everyday habit of letting something outside your head do the remembering or thinking for you.

All offloading. The mental work hasn’t gone away. It’s just been shifted onto a tool.

So why do we do it?

We offload either because we don’t trust ourselves to do the task well, or because we don’t want to spend the effort doing it. Often it’s both.

The brain is built to economise on effort, and working memory is small and expensive. Holding seven things in your head while doing an eighth is genuinely costly, and your mind has spent a long time learning to put some of those things down.

When you offload a cognitive task, it’s not necessarily about making life easier — it’s about expanding your capability.

You can follow an argument better when there’s a diagram to explain it. You can plan your week more efficiently with a calendar on the wall. Or you can just sit back and enjoy Netflix without worrying about your to-do list for tomorrow.

Asking why we offload is a bit like asking why we use our hands to do the dishes instead of our feet. We use the resources we have in the ways that seem most obvious, and that includes doing whatever we can to reduce brain-strain.

Offloading to AI — what have you got to lose?

Every technology has its critics, as we saw in the newspaper spreads in Lesson 1. They turned out to be wrong about the apocalypse, but right about something smaller.

Writingc. 370 BCE

Hot take

Writing will end human memory.

Cold truth

We’ve forgotten how to carry an epic in our heads.

Printing1492

Hot take

The printing press will devalue scholarship.

Cold truth

We’ve lost the meditative learning that came from copying-by-hand.

Mapping2020

Hot take

GPS is breaking our brains.

Cold truth

We don’t build the mental maps that help us when we get lost.

We are right to be concerned about what AI might be doing to our brains, but it’s wise to treat the doom-laden headlines with suspicion.

What feels different about AI is its scope. A calculator offloads arithmetic. GPS offloads navigation. AI offloads something much broader — drafting, summarising, deciding, reasoning. The breadth of what we can hand over should give us pause: it doesn’t just let us skip mental arithmetic or map-reading.

It tempts us to skip thinking altogether.

And the pull is real. The draft looks competent. The summary sounds right. The argument it built for you reads better than the one you’d have written yourself. You start to trust it — and because you’ve stopped doing the work, you never get the feedback that might tell you otherwise. The belief becomes self-fulfilling. The less you do it yourself, the more it shows when you try.

Many of us have now moved past ‘should I use AI?’ to ‘how do I use AI responsibly?’. That’s where we’ll be going next.

At the end of the last lesson, we began considering the pros and cons of offloading to AI. That’s a cost-benefit calculation, and is the subject of this lesson.

Sometimes that’s exactly what you wanted: you didn’t need to memorise your shopping list. Sometimes it isn’t — you wanted to actually understand the document, not just have an opinion about it.

Four broad costs

Let’s examine four broad costs of offloading to AI, ones that most of us probably worry about paying even if we don’t have a name for them.

Watch the video or read the transcript to learn about each one, and as you go, ask whether it might apply to the tasks you selected earlier. You’ll look at this properly at the end of the lesson.

An honest note on the labels: these four costs are our names for real patterns in the research — useful handles, not settled scientific categories.