The Grateful Brain

A study by a couple of American researchers assigned young adults to keep a daily journal of things they were grateful for (Emmons and McCullough, 2003). They assigned other groups to journal about things that annoyed them, or reasons why they were better off than others. The young adults assigned to keep gratitude journals showed greater increases in determination, attention, enthusiasm and energy compared to the other groups. While that shows a clear benefit of gratitude, it also makes a clear distinction. Realizing that other people are worse off than you is not gratitude. Gratitude requires an appreciation of the positive aspects of your situation. It is not a comparison. Sometimes noticing what other people don’t have may help you see what you can be grateful for, but you have to take that next step. You actually have to show appreciation for what you have, for it to have an effect.

The effect of gratitude is not just limited to young adults who haven’t yet been beaten down by the sad realities of life. In addition, even less frequent moments of gratitude can have an effect. The same researchers conducted a separate study on adults, which showed that even a weekly gratitude journal was beneficial. Subjects assigned to journal weekly on gratitude showed greater improvements in optimism. That makes sense. But that’s not all; it also influenced their behaviors. Keeping a gratitude journal also caused greater improvements in exercise patterns. Lastly, it also caused a reduction in physical ailments, so these subjects had fewer aches and pains (tired of your carpal tunnel syndrome? Be grateful you don’t have a headache).

A study from earlier 2012 did not require a gratitude journal, but simply looked at the amount of gratitude people tended to show in their daily lives. In this study, a group of Chinese researchers looked at the combined effects of gratitude and sleep quality on symptoms of anxiety and depression. They found that higher levels of gratitude were associated with better sleep, and with lower anxiety and depression. This begged the question, is the level of gratitude improving these symptoms or is it the fact that the patients are getting better sleep?

The wide variety of effects that gratitude can have may seem surprising, but a direct look at the brain activity during gratitude yields some insight. The l study from the National Institutes of Health (NIH). NIH researchers examined blood flow in various brain regions while subjects summoned up feelings of gratitude (Zahn et al, 2009). They found that subjects who showed more gratitude overall had higher levels of activity in the hypothalamus. This is important because the hypothalamus controls a huge array of essential bodily functions, including eating, drinking and sleeping. It also has a huge influence on your metabolism and stress levels.

Furthermore, feelings of gratitude directly activated brain regions associated with the neurotransmitter dopamine. Dopamine feels good to get, which is why it’s generally considered the “reward” neurotransmitter. But dopamine is also almost important in initiating action. That means increases in dopamine make you more likely to do the thing you just did. It’s the brain saying, “Oh, do that again.”

Gratitude can have such a powerful impact on your life because it engages your brain in a virtuous cycle. Your brain only has so much power to focus its attention. It cannot easily focus on both positive and negative stimuli. It is like a small child: easily distracted. Oh your tummy hurts? Here’s a lollipop. So you lost your job? Isn’t it wonderful we’re having KFC for dinner? On top of that your brain loves to fall for the confirmation bias, that is it looks for things that prove what it already believes to be true. And the dopamine reinforces that as well. So once you start seeing things to be grateful for, your brain starts looking for more things to be grateful for. That’s how the virtuous cycle gets created.

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