From Medical News Today:
Harvard neuroscientist Diana Tamir, who conducted the experiments with Harvard colleague Jason Mitchell said:
"Self-disclosure is extra rewarding ... People were even willing to forgo money in order to talk about themselves."
Their findings, which were published in the Proceedings of the National Academy of Sciences, goes beyond mere theory or opinion and looks at the brain function associated with talking about oneself. The scientists found that self-disclosure was strongly associated with increased activation in brain regions that form what is known as the mesolimbic dopamine system, and includes the nucleus accumbens and ventral tegmental area.
Together, the findings show that the human tendency to convey information about personal experience, may arise from the intrinsic value associated with self-disclosure.