What the checking costs

You may think of the habit as costing a minute a day and some private embarrassment. I think it costs more, and most of this chapter is my own reckoning. I'll say where a study comes in.

The picture. Every recheck fades the memory of the once. That's the finding in chapter 3, and it's the cost that makes all the others. You've spent years turning clear memories into fog, and you've called the fog a bad memory.

The trust. You don't believe your own recollection of the most routine acts of the day. That's a strange way to live, and it spreads. A person who can't trust that they locked the door begins not to trust that they sent the form, paid the bill, or said the right thing. Alcolado and Radomsky's experiment showed that low confidence in memory produces urges to check on its own. The habit has been manufacturing that confidence problem daily.

The morning. The first hour of the day, when you should be thinking about what's ahead, is spent on the door, the hob and the straighteners. Then the drive is spent on the replay. Work begins with a residue of doubt that takes until ten to clear.

Time and lateness. Small per check, and the tally will show the total. Rechecks are also why some people are late, and they say it's traffic.

The spread. Chapter 10 described how calm is portable and doubt follows it. A habit that began with the front door now covers the hob, the straighteners, the alarm, the sent folder and the car, and it's still recruiting. The cost isn't the checks you do now. It's the ones the habit will find next year.

Other people. The partner who's learned to answer. The colleague who gets the "did you get my email" that's really "was my email all right". The child who watches you go back three times and learns that leaving the house is dangerous.

Responsibility, inflated. Rachman's loop and van den Hout's finding that repeated checking reduces the sense of having acted responsibly. You feel the house depends on you more than it does, and you feel less like someone who's dealt with it, and both feelings grow with the checks.

The self. Somewhere in there you became a person who checks. Anxious, unreliable in your own eyes, a bit of a joke to the family. None of that is true of you. It's true of the habit.

In return for all that, you've had ninety seconds of calm several times a day, each one paid for with a fainter picture and a larger doubt. That's the trade, laid out. I'd take the other side of it.