3. Marcus Raichle and the Default Mode Network
Dr. Marcus Raichle’s groundbreaking research led to the discovery of the default mode network (DMN), a network of brain regions that remain active when we’re not focused on the outside world. Using positron emission tomography (PET) and functional MRI (fMRI), Raichle observed consistent patterns of activity during rest. These findings revealed that the DMN is involved in self-reflection, daydreaming, and memory recall. This spontaneous brain activity challenges the notion of “unused” brain areas and highlights the mind’s intrinsic dynamism.