Short answer: A curiosity gap is the feeling: the gap between what a viewer knows and what they want to know. An open loop is the tool: a specific question your video raises and deliberately leaves unanswered until later. The title and thumbnail open a curiosity gap that earns the click; inside the video, open loops keep creating new gaps and closing old ones on a schedule, so there is always a reason to keep watching.
What is a curiosity gap?
The idea is usually traced to George Loewenstein's 1994 review of the psychology of curiosity, which described curiosity as arising when attention is drawn to a gap in one's knowledge. A small, specific gap ("which of these three costs the most?") pulls harder than a vague one ("interesting facts about money"), because the viewer can tell the answer is within reach.
In YouTube terms, a curiosity gap is what makes someone click: the title and thumbnail show enough to make the question clear and hold back the answer.
What is an open loop?
An open loop is a question the video has raised and not yet answered. It is a structural device: it has a line that opens it, a timestamp where it opens and a timestamp where it closes. Lines that open loops sound like:
- "The third one is the one that actually made the difference, and it's the opposite of what I expected."
- "There's a catch with this. A big one. I'll get to it."
- "Keep this number in your head. It comes back at the end."
Our guide to open loops in video editing covers them in depth.
Curiosity gap vs open loop, side by side
| Curiosity gap | Open loop | |
|---|---|---|
| What it is | A psychological state: wanting to know | A device in the script and edit: a question held open |
| Where it lives | Mostly the title and thumbnail, and any single moment | The video's timeline, from the first seconds to the final 10% |
| How long it lasts | Until the viewer gets the answer or loses interest | Exactly as long as you plan: it opens and closes at set points |
| How you measure it | Click-through rate from impressions | The audience retention graph |
| What breaks it | A vague question, or an answer visible in the thumbnail | Answering too early, never answering, or a stretch with no loop open |
How they work together
- The packaging opens a gap. The title and thumbnail ask a clear question.
- The first seconds turn it into a loop. Confirm the question straight away, so the viewer knows they clicked the right video, and promise when it will be answered. See how to write a hook that matches the title and thumbnail.
- The body keeps adding loops. Before you answer one question, raise the next, so a new gap opens as the old one closes.
- The ending closes the main loop. Answer the title's question in the final 10%, fully.
In a long documentary you run several loops at once. How to stack open loops in a documentary shows a full timeline.
When a curiosity gap becomes clickbait
A gap is a promise. Clickbait is a promise the video breaks. YouTube warns that if your title does not accurately represent the video, viewers may stop watching, which can impact discoverability. The test is simple: could a viewer who clicked say, at the end, "it answered exactly what the title asked"? If not, change the title or the video.
A quick exercise
Write your next title's question in one sentence. Then write the timestamp where the video answers it. If it is before the final 10%, move the full answer later and pay off part of it earlier. Then list the questions you will raise along the way, one for every 30 to 60 seconds of the video, and check each one gets an answer.
Learn the full system
Our book Secrets to become a celebrity on Youtube covers matching the title and thumbnail promise, the Promise, Proof, Path hook, open loops, the payoff ladder and the 40% re-hook, with a free 2-page preview on the book page. To score your own opening, try the free YouTube Hook Checker.
Frequently asked questions
Is a curiosity gap the same as an open loop?
They are closely related but not the same. A curiosity gap is the gap between what someone knows and what they want to know. An open loop is a specific question a video raises and deliberately answers later. The loop is how you create and time the gap.
Where does the curiosity gap theory come from?
It is usually traced to the economist and psychologist George Loewenstein, whose 1994 review in Psychological Bulletin described curiosity as arising when attention is drawn to a gap in one's knowledge.
Do titles and thumbnails use curiosity gaps or open loops?
Both. The title and thumbnail create the curiosity gap that earns the click, and that same question becomes the first open loop of the video, which the first seconds must confirm.
How do I measure each one?
Curiosity gaps in packaging show up in click-through rate from impressions. Open loops inside the video show up in the audience retention graph, as flatter stretches where loops are open and dips where they are missing.
When does a curiosity gap become clickbait?
When the video does not deliver what the title or thumbnail promised. YouTube warns that if your title does not accurately represent the video, viewers may stop watching.
Sources
- Loewenstein, G. (1994). The psychology of curiosity: A review and reinterpretation. Psychological Bulletin, 116(1), 75–98.
- YouTube Help: Thumbnail and title tips
- YouTube Help: Measure key moments for audience retention
- Secrets to become a celebrity on Youtube, Part 5 (Structure: Loops, Payoffs and Re-Hooks) and Part 7 (Pattern Interrupts), Asendify, 2026