Zeigarnik Effect (Bite-size Article) – DEV Community

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Have you ever heard of the term “Zeigarnik Effect”?
It refers to the psychological phenomenon where people tend to remember tasks that were left unfinished more than those they completed.

Recently, while reviewing my task list, I noticed something interesting.
There were dozens of old postponed tasks that had been sitting there for a long time.
I deleted the ones that were no longer necessary and rescheduled the ones that still mattered. But what struck me was how clearly I still remembered the thoughts and context behind those old tasks.

Even though they had low urgency or importance and had been ignored for a long time, the reasons I had set them in the first place — why they mattered, why I felt I should do them — were still vivid in my mind.

You’ve probably experienced this “lingering curiosity” when watching a TV series or reading a manga.
When the story ends on a cliffhanger, you feel a strong urge to know what happens next, don’t you?

That’s the Zeigarnik Effect in action.

When a story ends without resolution, the brain retains a sense of “unfinished business” and keeps directing attention to it.
This ongoing feeling of “I need to know” can also be interpreted as a form of discomfort — a tension caused by something incomplete.
In some situations, it may even resemble a state similar to cognitive dissonance.

In other words, while the Zeigarnik Effect arises from the brain’s tendency to focus on unfinished tasks, cognitive dissonance is a separate psychological phenomenon where discomfort is caused by holding contradictory thoughts or behaviors.
Although their mechanisms differ, both can create similar psychological tension that lingers and motivates us to resolve it.

The Zeigarnik Effect can be used as a practical tool to maintain and reignite focus.

Here are some effective ways to apply it:

  • Intentionally stop large tasks midway
    When you’re faced with a large task, it’s tempting to finish it all in one go.
    However, there’s a strategy of deliberately pausing partway and taking a break.
    At that moment, your brain retains a sense of “unfinished business” — this is the Zeigarnik Effect — which helps you naturally regain focus when you return to the task.

Furthermore, a mild sense of cognitive dissonance — “I said I’d do it, but it’s still not done” — keeps your motivation alive.

In this way, even while your body is resting, the psychological tension remains.

This allows you to resume the task in better condition than if you had powered through it, and potentially deliver higher performance.

  • Write your TODOs in an “in-progress” state
    Instead of writing tasks as if they’re to be completed from scratch, try noting them down as already partially started. For example:

✗ “Write an article”

✓ “Finish the first part of the article”

By stopping after you’ve written the opening of an article or just started your code, your brain stays engaged.

Next time, you simply “continue,” not “start,” which lowers the barrier to action.

The Zeigarnik Effect makes that “unfinished” task linger in your mind, nudging you back into action naturally.

  • Use it in studying and memory retention
    This effect is also useful in learning. For example, when doing practice exercises, avoid checking the answers immediately.
    Instead, leave the unsolved parts for a while before revisiting them.

By keeping a sense of “this hasn’t been resolved yet,” you leave the brain in a slightly tense state that actually helps encode the information more deeply.

This kind of unfinished mental state helps sustain your attention and enhances memory consolidation, even subconsciously.



Tip: Beware of too many unfinished tasks

While the Zeigarnik Effect has powerful applications, there is a downside.

Too many unfinished tasks can become a source of stress.

If your brain is constantly juggling open loops, your mental resources will get drained.

That’s why it’s important to regularly review your tasks — either mark them as done or consciously delete what no longer matters.

As mentioned at the beginning, the inspiration for this article came from reviewing my own task list.

We all have unconscious emotional reactions to the things we do — or don’t do — each day.

By understanding these reactions through the lens of psychology, we can start to see the underlying patterns in our behavior.

The Zeigarnik Effect is one such insight.

By leaving things “in progress,” we can naturally maintain momentum and motivation.

Harnessing this subtle psychological mechanism may just help you improve your day-to-day performance.

Leave it unfinished —

that small open loop might be exactly what helps you move forward tomorrow.



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