Eat Your Peas First: The Premack Principle as a Way Out of Bed
The Premack principle, also called Grandma's rule, says something you like can pay for something you avoid. Here is how to run it on your morning.
In this article5 sections
“Eat your peas, then you can have dessert.” Most kitchens have run some version of that sentence, and psychologist David Premack gave it a formal statement in 1959: of any two behaviors, the one a person is more likely to choose can serve as the reward for the one they are less likely to choose. For mornings, that means the coffee, the shower or the podcast you never skip can be used to pull forward the part you do skip, as long as it comes strictly second.
What did Premack actually find?
The paper is “Toward empirical behavior laws: I. Positive reinforcement,” in Psychological Review (1959, volume 66, pages 219-233). Textbooks usually illustrate it with a study of children given a candy dispenser and a pinball machine. Researchers first watched which one each child chose more. Roughly half preferred candy and the rest preferred pinball. Then each child was tested with one activity made the price of the other. Children who favored candy played more pinball when pinball unlocked candy, and children who favored pinball ate more candy when eating it unlocked pinball. The less-liked activity never worked as a reward for the more-liked one.
I could not open the original paper to check the sample size, so I have left it out. The structure above comes from consistent textbook and encyclopedia descriptions, including Wikipedia’s entry on Premack’s principle.
Notice what carried the effect. Candy was not a better reward by nature. It was a better reward for the children who happened to choose it more, which means the “reward” is defined by your own behavior, not by a category of treats.
How is this different from temptation bundling?
Temptation bundling puts the treat inside the chore: the audiobook plays while you are on the treadmill. Premack runs the two in sequence, with the treat held back until the chore is done. The explainer on temptation bundling covers the first, and an earlier post, sequencing your morning like Premack did, gives a five-step version of the second. This piece goes at the part that one skips, which is how to rank your own morning behaviors and what the research says can go wrong. The older post dates the principle to 1965, but the paper that states it is from 1959.
What does a morning ladder look like?
Start from observation, not aspiration. For a few mornings, note what you do with no push at all. For most people the reliable list is short: bathroom, coffee or tea, a shower, glancing at the phone. Rank them by how bad the day would have to be before you skipped them.
Then find the behavior at the bottom of the real list, the one you keep negotiating with. It is rarely “wake up.” It is usually “put your feet on the floor.” Write one sentence that joins them: first feet on the floor, then the kettle.
A fuller ladder might run: feet down, then lights on, then the kettle, then the podcast. Each rung is a behavior you are likelier to do than the one before it. The point of the ordering is that every pleasant thing is behind a slightly less pleasant thing, so the unpleasant step stops being a cliff.
This also explains why habit stacking fails when the anchor is shaky. Premack asks for no anchor, only a ranking.
When does the Premack principle backfire?
Two limits.
First, probabilities move. On a Saturday, staying in bed may outrank the coffee, and the ladder collapses. A rule built on a weekday ranking needs a weekend ranking of its own.
Second, rewards can change how an activity feels. Edward Deci’s 1971 study in the Journal of Personality and Social Psychology (volume 18, pages 105-115) found that college students paid for solving puzzles tended to lose interest in them afterward. Lepper, Greene and Nisbett (1973) saw something similar in preschoolers who liked drawing with markers: those promised a “Good Player” certificate later drew less on their own. Both studies concern activities people already enjoyed, and later meta-analyses found the effect depends on the kind of reward. A longer look at the overjustification research goes through those numbers. The practical lesson for a ladder is to make the payment something ordinary, like the first coffee, and to keep an activity you truly love, such as a morning run, off the payment list.
Where does an app fit in?
The weak spot of the ladder is the word “first.” Nobody is watching whether your feet touched the floor, so the rule is only as strong as your honesty at 6:40. DontSnooze makes the first rung checkable: when the alarm goes off, you have 30 seconds to record a video showing you are up, and if you do not, a random camera-roll photo goes to your friends. The kettle can then wait on something other than a promise you made to yourself while half asleep, and the reasoning behind systems that do not rely on willpower applies here too. It works on iPhone only for now.