A lot of so-called “positive psychology” can seem a bit flaky, especially if you’re the sort of person disinclined to respond well to an admonition to “look on the bright side.” But positive psychologists have published some interesting findings, and one of the more robust ones is that feeling grateful is very good for you. Time and again, studies have shown that performing simple gratitude exercises, like keeping a gratitude diary or writing letters of thanks, can bring a range of benefits, such as feelings of increased well-being and reduced depression, that often linger well after the exercises are finished.

The implication is that gratitude tasks work, at least in part, because they have a self-perpetuating nature: The more you practice gratitude, the more attuned you are to it and the more you can enjoy its psychological benefits.

Now a brain-scanning study in NeuroImage brings us a little closer to understanding why these exercises have these effects. The results suggest that even months after a simple, short gratitude writing task, people’s brains are still wired to feel extra thankful. The implication is that gratitude tasks work, at least in part, because they have a self-perpetuating nature: The more you practice gratitude, the more attuned you are to it and the more you can enjoy its psychological benefits.

The Indiana University researchers, led by Prathik Kini, recruited 43 people who were undertaking counseling sessions as a treatment for their anxiety or depression. Twenty-two of them were assigned to a gratitude intervention; for the first three sessions of their weekly counseling, this group spent 20 minutes writing a letter in which they expressed their gratitude to the recipient, an hour in total (whether they chose to send these letters was up to them). The other participants acted as a control group, so they simply attended their counseling as usual without performing the gratitude task.

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