How Gratitude Rewires Your Brain | Jim Kwik
These results are encouraging because many other studies suggest that the mental health benefits of positive activities often decrease rather than increase over time afterward. We don’t really know why this positive snowball effect occurred in our study. Perhaps the gratitude letter writers discussed what they wrote in their letters with their counselors or with others. These conversations may have reinforced the psychological benefits derived from the gratitude writing itself.About three months after the psychotherapy sessions began, we took some of the people who wrote gratitude letters and compared them with those who didn’t do any writing. We wanted to know if their brains were processing information differently.
We used an fMRI scanner to measure brain activity while people from each group did a “pay it forward” task. In that task, the individuals were regularly given a small amount of money by a nice person, called the “benefactor.” This benefactor only asked that they pass the money on to someone if they felt grateful. Our participants then decided how much of the money, if any, to pass on to a worthy cause (and we did in fact donate that money to a local charity).
We wanted to distinguish donations motivated by gratitude from donations driven by other motivations, like feelings of guilt or obligation. So we asked the participants to rate how grateful they felt toward the benefactor, and how much they wanted to help each charitable cause, as well as how guilty they would feel if they didn’t help. We also gave them questionnaires to measure how grateful they are in their lives in general.