Latest / Marketing Psychology with Fexingo: Behavioral Triggers, Persuasion, and Consumer Behavior / How the Zeigarnik Effect Keeps You Coming Back to Brands
Transcript
- Lucas: Luna, have you ever binge-watched a show you didn't even really like, just because every episode ended on a cliffhanger? Luna: Absolutely. I spent three nights on a mediocre thriller last month. I kept telling myself I'd stop after one more, but the hook at the end of each episode was too strong. Lucas: That's the Zeigarnik Effect in the wild. Named after a Russian psychologist, Bluma Zeigarnik, who noticed something strange at a restaurant in Berlin back in the 1920s. Luna: Wait — a restaurant? I thought this was a lab finding. Lucas: The origin story is almost apocryphal. Zeigarnik was at dinner with her professor, Kurt Lewin, and they remarked that the waiters could remember incredibly complex orders — multiple courses, special requests — but as soon as the bill was paid, they'd forgotten everything. The memory seemed to evaporate once the task was closed. Lucas: She went back to the lab and designed experiments where people worked on puzzles. Some were interrupted before finishing, others completed them. When asked to recall the puzzles later, participants remembered the interrupted ones about twice as often. Luna: So our brains hold onto open loops. That makes evolutionary sense — you need to remember the half-finished task so you can come back and finish it. Lucas: Exactly. And marketers have been using this principle forever, even if they didn't call it by name. Think about serialized content — the original novel serials in the 19th century, like Dickens publishing chapters in magazines. Every installment ended on a hook. Luna: But today it's so much more deliberate. Streaming platforms have turned the Zeigarnik Effect into a science. Lucas: Netflix is the obvious case. Their auto-play countdown after an episode — that ten-second timer — is designed to reduce friction. But the real genius is that they front-load the next episode with a cold open, a mini-cliffhanger, before the title sequence even plays. Your brain registers that as an incomplete scene. Lucas: There's data from a few years ago showing that shows with strong episode hooks have a binge rate about 70% higher than shows with self-contained episodes. The metric they track is 'completion velocity' — how quickly viewers move from episode to episode. Luna: Seventy percent is massive. And it's not just entertainment. The same principle drives engagement in apps like Duolingo. Lucas: Duolingo is fascinating because they weaponize the Zeigarnik Effect through streaks. When you skip a day, that streak number resets to zero. The unfinished chain becomes an open loop in your mind. The app also sends notifications that say things like 'You're on a 15-day streak — don't break it now.' Luna: I've definitely felt that. The idea of losing a 200-day streak feels genuinely painful, even though there's no real consequence. Lucas: And it's not just apps. Email marketers use the Zeigarnik Effect constantly. Subject lines like 'The one thing you're missing' or 'Your free report is ready' create a curiosity gap. You open the email because your brain wants closure on what that missing thing is. Luna: There's a famous study by George Loewenstein — the curiosity gap theory — that says we're driven to fill gaps in our knowledge. That's the same mechanism. Lucas: Right. Zeigarnik and Loewenstein are describing different sides of the same coin. One is about interrupted tasks, the other about missing information. Both create that cognitive itch. Luna: Where does this get ethically tricky? Because not all uses of the Zeigarnik Effect feel benign. When social media apps use infinite scroll and pull to refresh, they're exploiting the same loop. Lucas: That's the line. The Zeigarnik Effect itself is neutral. It's a feature of how memory works. But when you deliberately design experiences that keep people in a state of perpetual incompleteness — never letting them reach closure — you're moving into manipulation. Lucas: Tristan Harris at the Center for Humane Technology has talked about this. He calls it 'the dopamine-driven feedback loop.' But underneath the dopamine is the Zeigarnik Effect. You scroll because each new post is an incomplete piece of information. You can't close the loop until you've seen it. Luna: So where's the healthy middle ground? How do you use the principle ethically as a marketer? Lucas: Transparency and value. If you're creating a serialized email course that genuinely teaches something, and each email ends with a teaser for the next lesson — that's using the effect to help someone learn. It's a virtuous loop. The listener knows what's happening and they're consenting to the structure. Lucas: The problem is when the incompleteness is artificial and the payoff is empty. A lot of clickbait headlines work because they open a curiosity gap, but the content itself doesn't close it. That erodes trust over time. Luna: I want to bring up a real-world case. There's a retailer — I think it's Zappos — that used the Zeigarnik Effect in a really clever way. They send you a 'we're still working on your order' email if fulfillment takes longer than expected. It actually increased customer satisfaction. Lucas: That's brilliant. Because without that email, the customer has an open loop — 'Where's my order?' The email closes it temporarily: 'Here's the status.' The loop isn't fully closed until the package arrives, but you've reduced anxiety by giving a progress update. Lucas: Progressive disclosure in onboarding flows is another example. When you sign up for a SaaS tool, they don't show you all features at once. They show you one step, then reveal the next after you've completed the first. That creates a series of small completions that keep you engaged. Luna: And each completion releases a little dopamine. So the user feels accomplished while the system keeps them moving forward. Lucas: Right. The best product designers think about the 'completion arc' — not just the user journey, but the moments of closure along the way. Luna: That's a good phrase. Completion arc. I'm going to steal that. Lucas: Please do. And speaking of things that keep a show like this going — a quick honest thing. We don't run ads on Fexingo, and that's intentional. A small group of listeners already chips in monthly through buy me a coffee dot com slash fexingo, and that literally funds making this many episodes. Luna: Yeah, it's a simple model. If these conversations have sparked something you've actually used, that's the whole point. No pressure, just a heads-up that listener support keeps it ad-free. Lucas: Exactly. So back to the Zeigarnik Effect — I want to talk about how you can apply it in your own marketing without being creepy. Lucas: One practical tactic is the 'to be continued' email sequence. Instead of sending one long educational email, break it into three parts. End each email with a question or a promise of what's next. Open rates on the second and third emails often spike because the reader wants closure. Luna: I've seen data from a few email marketing tools showing that multi-part sequences have 30-40% higher click-through rates on the final email compared to a single long email. Lucas: That's the Zeigarnik Effect in action. The reader has invested time in the first two parts, and the unfinished narrative pulls them through. Lucas: Another example is in e-commerce. Some sites show a 'progress bar' during checkout — 'Step 2 of 4.' If you leave mid-checkout, that progress bar is an open loop. Abandoned cart emails that say 'You're almost there' tap directly into that. Luna: But there's a fine line. If the progress bar is fake — if all steps are actually the same page — users sense that manipulation. Lucas: Absolutely. Authenticity matters. The Zeigarnik Effect works best when the incompleteness is real and the completion has genuine value. Luna: So if I'm a small business owner listening, what's one thing I can do this week? Lucas: Look at your email onboarding sequence. If it's a single welcome email, break it into a three-email series. Each email should end with a hook for the next. And track whether your open rates improve on the second and third emails. Lucas: Or, if you run a content site, try splitting a long article into a two-parter with a 'next week we'll reveal the key insight' ending. That creates a return visit. Luna: And measure the return rate. That's the clearest signal. Lucas: Right. The Zeigarnik Effect is one of those rare principles that's both easy to implement and backed by decades of research. The challenge is using it in a way that respects the user's time and attention. Luna: I think that's the core takeaway — it's a tool, not a trick. When you use it to genuinely help someone learn or complete a task, it builds trust. When you use it just to trap attention, it backfires. Lucas: Exactly. And that's the line we'll keep coming back to in this series. Thanks for listening, Luna. Luna: Always a good conversation.