Why We Prefer More Pain: The Peak-End Effect

Ryan Halloran

So, uh, think back to 1993. There's this, well, it's a famous study by Daniel Kahneman and his colleagues, and they set up this incredibly bizarre experiment. They had people submerge their hand in freezing 14°C water—which, if you've ever done it, is incredibly painful—for exactly 60 seconds. That was trial A. Then, for trial B, they had them do the exact same thing—60 seconds in the 14°C water—but then they kept their hand in there for an extra 30 seconds while the water temperature was slowly raised to a slightly warmer, but still very cold, 15°C.

Dr. Maya Chen

Wait, so the second trial was actually longer? Like, 90 seconds of pain instead of 60?

Ryan Halloran

Exactly. Ninety seconds total. Thirty seconds more of actual physical discomfort. But here's the kicker, Maya. When they asked these participants which trial they would prefer to repeat, the majority chose the longer one. They literally chose *more* total pain over less.

Dr. Maya Chen

It-it-it sounds completely irrational, right? But what we're looking at here is the classic demonstration of what Kahneman called the Peak-End Rule, combined with duration neglect. You see, our brains, um, they don't function like video cameras. We don't record every single second of an experience and then calculate the average. Instead, the brain acts like a really biased film editor. It takes a, say, a grueling hour-long workout or a stressful workday, and it condenses it into a tiny highlight reel.

Ryan Halloran

And that highlight reel only has, what, two scenes?

Dr. Maya Chen

Exactly. It's heavily weighted by just two data points: the most emotionally intense moment—the peak, which can be positive or negative—and the very end of the experience. The actual length of the event, the duration, is basically thrown in the trash. That's duration neglect. So, in that ice-water study, the "end" of the 90-second trial was slightly less painful at 15°C, so the brain remembered the whole thing as less unpleasant, ignoring the extra 30 seconds of freezing cold.

Ryan Halloran

That is so wild. And, you know, as a coach, I see this play out in the daily dread cycle. If you're doing something tedious, like, uh, sorting your tax documents or doing a high-intensity workout, and you push yourself to absolute, miserable exhaustion right at the very end... your brain edits that final, painful moment as the "end" marker. So, next week, when you think about starting that task again, your brain pulls up that specific memory reel. It says, "Nope, that ended miserably, don't do it." We avoid starting because we're anticipating the dread we encoded at the finish line.

Dr. Maya Chen

Well, and what's exciting is that we can actually hack this editing process. There was a randomized controlled trial published in the *Journal of Sport and Exercise Psychology* that tracked 46 non-regular exercisers. Over an eight-week period, they had these participants use pleasure-oriented strategies during their workouts—basically manipulating the peaks and the ends. And guess what? It significantly boosted their "remembered affect"—how they remembered feeling—and, more importantly, it actually increased how often they chose to exercise during the follow-up. They changed the memory, which changed the behavior.

Ryan Halloran

Wait, forty-six people? That's, uh, that's a pretty small sample size, isn't it?

Dr. Maya Chen

Oh, absolutely. We have to be honest about the caveats here. It's a small study, it relies on self-reported data, and look, let's be real—duration neglect has limits. You can't make a grueling ten-hour manual labor shift feel like a spa day just by eating a chocolate chip cookie at the end. And if you're someone prone to negative rumination, your brain might still laser-focus on a bad peak no matter what you do. But for everyday tasks, the principle is incredibly robust.

Ryan Halloran

Okay, so how do we actually use this tomorrow morning? I've been thinking about a three-step playbook for this. Step one: ignore the middle slog. If you're doing a tedious task, just accept that the middle is going to be boring or mildly annoying. Let your mind wander. Don't fight it, because your brain is going to delete most of that middle anyway due to duration neglect.

Dr. Maya Chen

Right, let the editor cut it out. What's step two?

Ryan Halloran

Step two is to intentionally flag a micro-peak. You want to insert or notice one bright spot. If you're running, time your favorite, high-energy song to hit right when you're tackling the hardest hill. Or if you're deep cleaning, take ten seconds to stand back and admire how clean the kitchen table looks. Mentally tag that moment. Say to yourself, "This is the win." You're feeding the brain a positive peak for its highlight reel.

Dr. Maya Chen

I love that. And then, I assume, step three is all about the finish?

Ryan Halloran

Yes! Step three is design the soft landing. Never work or workout to absolute, soul-crushing exhaustion. If you have a 30-minute writing block, stop at 25 minutes. Use the last five minutes for a pleasant ritual—stretch, sip a warm tea, or just sit quietly. You are hard-coding a peaceful, positive finish into your memory bank. If the ending feels good, the next start becomes almost effortless.

Dr. Maya Chen

It's a complete shift. Instead of managing the actual experience, we are actively managing the memory of the experience. It's, uh, it's pretty empowering when you think about it.

Ryan Halloran

It really is. Try it tomorrow. Soft landings, guys. Talk to you next time.