12. PET and fMRI: Peering Into the Active Brain
Technologies like PET and fMRI have revolutionized our understanding of the brain’s inner workings. By measuring blood flow and metabolic changes, these scans make visible the constant neural activity that persists, even during rest or daydreaming. What once appeared as idle or “inactive” brain regions have been revealed as hubs of dynamic connectivity. Thanks to these imaging advances, scientists can now track how thoughts, memories, and emotions flow through the brain—shattering the myth of vast, unused mental territory.