" Another study showed that humor appreciation also activates the dopamine-rich nucleus accumbens, as well as the brain stem region that produces dopamine, which explains the enjoyable aspect of humor. It also activates areas of the dorsal striatum, which suggests that there is something habitual about humor appreciation. It is something you can practice, something you can get better at. At the very least, you now have a scientific reason to watch funny videos on YouTube. "

― Alex Korb , The Upward Spiral: Using Neuroscience to Reverse the Course of Depression, One Small Change at a Time