Default Mode Network (DMN)
The default mode network, usually shortened to DMN, is a network at the front of the brain that includes the angular gyrus, the posterior cingulate cortex, and the medial prefrontal cortex. This area of the brain is most active when someone is not focused on the outside world and is instead daydreaming, wandering, or resting in a wakeful state. The network can also be active when someone is thinking about something deep, reminiscing about certain memories, and making plans for the distant future. Problems involving this part of the brain are common in individuals who are diagnosed with autism spectrum disorder and Alzheimer's disease. The network has been studied extensively by research professionals who are looking for new treatment options for mental health issues.