80,000 People in Solitary: What It Does to the Brain

On any given day, roughly 80,000 people in the United States are held in solitary confinement — some for days, some for decades. This episode explores what actually happens to the human mind and body when all social input is stripped away. We break down the documented effects: SHU syndrome, sensory starvation, circadian collapse, and the phenomenon of "ego dissolution" that leaves people unable to function in society after release. We also trace the practice from its 19th-century origins as a Quaker reform to the modern supermax era, and examine the uncomfortable tension between security needs and a punishment the UN classifies as torture after 15 days.