Latest / Marketing Psychology with Fexingo: Behavioral Triggers, Persuasion, and Consumer Behavior / How the Zeigarnik Effect Keeps You Coming Back to Unfinished Tasks
Transcript
- Lucas: You ever notice how a half-watched TV show—something you weren't even that into—keeps nagging at you until you finish it? But a movie you loved, once the credits roll, you barely think about it the next day. Luna: Yeah, that's the Zeigarnik Effect. Named after a Soviet psychologist from the 1920s who noticed something about waiters. Lucas: Exactly. Bluma Zeigarnik was in a restaurant in Vienna, and she observed that waiters could remember complex unpaid orders—like ‘table four, one wiener schnitzel, two goulashes, one mineral water’—but as soon as the bill was settled, they'd forget the whole thing. Luna: So the unfinished order stayed in working memory. The completed one got dumped. Lucas: She went back to the lab and ran a formal experiment. Gave people simple tasks—puzzles, arithmetic problems—and interrupted half of them before they could finish. Then she tested recall. The interrupted tasks were remembered about twice as often as the completed ones. Luna: That's wild. So our brains basically put the unfinished stuff on a mental to-do list and don't release it until the checkbox is filled. Lucas: Right. And once the task is done, the brain goes, ‘okay, file that away, no need to keep it active.’ The implication for marketing is huge. Every time you create an open loop—something the consumer hasn't resolved—you're borrowing a bit of their mental bandwidth. Luna: Which is why Netflix drops you at the end of an episode with a ten-second countdown to the next one. They're exploiting the discomfort of the cliffhanger. Lucas: Absolutely. And Netflix has the data to prove it. They've said the countdown feature alone increased binge-watching by, I think, around 20 percent. The open loop of ‘what happens next’ is so strong that people will sit through an episode they're only mildly interested in just to close that loop. Luna: But it's not just entertainment. I see this all the time in email marketing. Subject lines that tease—like ‘Your free guide is ready… almost’ or ‘One last step to claim your discount’—those get way higher open rates. Lucas: Yeah, because you've created an expectation that something is waiting. But you have to be careful. If the content behind that subject line doesn't deliver, you've violated trust. The loop closes with frustration, not satisfaction. Luna: And there's a fine line between a productive open loop and a manipulative one. Like those fake progress bars on some websites that say ‘you're 80% done with your profile’ but actually there's no real completion. Lucas: LinkedIn does that really well, though, in a positive way. The profile strength meter—‘your profile is 65% complete’—that's a pure Zeigarnik trigger. You feel compelled to fill in that last section, even if you don't know why you need it. Luna: And Duolingo. The streak notifications. They're not just using loss aversion—they're also using the fact that a streak is never truly finished, it's always ongoing. There's always a next day to maintain the loop. Lucas: Right. But here's where it gets interesting: the Zeigarnik Effect only works if the person believes the task is achievable. If the gap between where they are and completion feels too wide, they just abandon it. That's why shopping carts get abandoned when checkout friction is too high. Luna: So the loop doesn't close, but it also doesn't motivate—it just frustrates. That's the dark side. Lucas: Exactly. And it's been studied. In one experiment, researchers gave participants an impossible puzzle. Those interrupted early on showed higher recall later compared to those given a solvable puzzle. But the recall was accompanied by negative emotions. So you get memory, but bad associations. Luna: Which means if you're a marketer using open loops, you need to make sure the completion step is clear and doable. Otherwise you're just training people to ignore your messages. Lucas: Let's talk about a practical application that's been getting a lot of traction: the ‘progress toward a goal’ bar in crowdfunding. Kickstarter projects that show a percentage funded—especially ones that hit 80 or 90 percent early—get a surge of backing in the final days. Luna: Because people want to be the one who helped push it over the line. That's the loop: ‘I can be part of the completion story.’ Lucas: Yeah. And the most successful campaigns often reset the goal or add stretch goals, which creates new open loops. You close one, but then a new one appears. Luna: It's addictive. I remember reading about a study where they gave people a loyalty card—buy 10 coffees, get one free. One group got a card with 10 blank stamps. Another got a card with 12 stamps but two already stamped. So they were 2/12 done. Lucas: Classic. The group that started at 2/12 completed the card much faster. Because they felt they were already in progress. The open loop had already been started for them. Luna: So the implication for onboarding is: don't make new users start from zero. Give them a few pre-completed steps. Like ‘you're already 20% done with your profile just by signing up.’ Lucas: And that loops back to something we've talked about before—the endowment effect. Once you feel ownership over that partial progress, you're more invested. The Zeigarnik Effect and the endowment effect working together. Luna: You know, speaking of things that feel like progress, it reminds me of how this show runs. We don't have ads, and we keep the conversations focused, and listeners often tell us they use these insights in their own work. If these marketing conversations have sparked something you've actually used, we'd love it if you'd consider supporting the show. You can buy us a coffee at buy me a coffee dot com slash fexingo. It's a small gesture, but it helps us keep doing what we do. Lucas: Yeah, it really does. And we genuinely appreciate every bit of support. Now, back to the Zeigarnik Effect—one more angle I think is worth unpacking: the role of interruption itself. Luna: Go on. Lucas: Zeigarnik's original experiment used interruption. She literally stopped people mid-task. That's different from just presenting an incomplete picture. Interruption creates a spike in tension. And that tension is what drives the recall. Luna: So if you're creating content, a mid-story cutaway or a teaser that breaks the flow might be more powerful than just a cliffhanger at the end. Lucas: Exactly. There's a podcast network that tested this. They split episodes into two parts, but released them a week apart. Listeners who heard the first half were significantly more likely to subscribe and come back for the second half than those who got the full episode in one go. Luna: Because the cognitive itch is stronger when you're literally pulled away from the story. Lucas: Right. And this works in B2B marketing too. Think about a webinar that ends with ‘next week we'll reveal the data on that.’ You've created a specific, time-bound expectation. People show up. Luna: But you also have to deliver. That's the ethical part. If you tease something and then the reveal is weak, you've closed the loop with disappointment. Lucas: Yeah. And the research suggests that once a loop is closed, the emotional residue of that closure—positive or negative—gets attached to your brand. So a satisfying close builds loyalty. A frustrating one erodes it. Luna: So the takeaway for today is: use open loops deliberately. Make sure the completion step is clear, achievable, and rewarding. And don't overdo it—too many open loops just create noise. Lucas: And if you're designing a user experience, think about where you can create a natural, small incompleteness that the user wants to resolve. A progress bar. A ‘next step’ prompt. A countdown. But always finish the story somewhere. Luna: Because our brains are wired to seek closure. And if you help them find it, they'll remember you.