The brain’s default mode network, a series of connections that create what the brain is doing/thinking when it isn’t focused on any one thing in particular, appears to be hyperactive when emotional disorders are present, according to research from the University of Illinois-Chicago.  For more information, read Science Daily’s summary of the research, which is linked below.

Neurofeedback is not mentioned in this article, but certain neurofeedback protocols are designed to train the default mode network.

https://www.sciencedaily.com/releases/2016/09/160928141901.htm