When People Say They Can Spot an AI-Written Book, What Are They Actually Seeing?

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Recently, I came across an interesting comment.

Someone claimed that books written using AI are easy to identify.

At first, I thought that was a bold statement.

After all, AI-generated writing has improved significantly over the last few years.

In some cases, it’s surprisingly good.

It can produce clear sentences, organise ideas, and even imitate different writing styles.

So that got me thinking.

When readers say they can tell a book was written by AI, what are they actually detecting?

Is it the technology? Or is it something else?

The more I thought about it, the more I started to wonder whether readers are really detecting AI at all.

Perhaps they’re detecting the absence of something human.

I thought about those books that stays with us long after we’ve finished reading them.

Often it’s not because the grammar was perfect.

Or because every sentence was beautifully structured. It’s because the story felt real.

The characters felt believable. The emotions felt genuine.

The writer seemed to understand something about people.

That’s difficult to measure.

And it’s even harder to automate.

As an author myself, I’ve noticed that many of the most memorable moments in writing don’t come from following a formula. They come from observation. A conversation you overheard. A mistake you made. A difficult experience. Moments that changed how you see the world.

Those things have a habit of finding their way into the page.

That’s why I think this discussion is bigger than AI.

Even before AI existed, readers often criticised books that felt generic, repetitive, or emotionally flat.

The complaint wasn’t:

“This feels written by AI.”

The complaint was:

“This doesn’t feel real.”

Perhaps that’s the question worth asking as AI becomes more involved in creative work.

The question is not whether AI can write.

Clearly it can.

The more interesting question is whether readers are looking for good writing alone.

Or whether they’re looking for evidence that another human being was behind it.

Because stories have always been more than words on a page.

They’re a way for people to share experiences, perspectives, and emotions with each other.

And maybe that’s why authenticity still matters.

Not because technology is incapable of producing sentences.

But because readers are often searching for something deeper than sentences.

They’re searching for a human connection.

Curious — if you picked up a novel and discovered it had been heavily written by AI, would it change how you felt about reading it?