Solitary confinement is defined as the isolation of an incarcerated person for 22 to 24 hours per day; often the only interactions a prisoner can expect during solitary are brief encounters with prison guards. Evidence found in the International Journal of Offender Therapy & Comparative Criminology points to the historical Quakers as being the originators of solitary confinement, and it was initially intended to be used as a way to make prisoners take a few days to reflect on their wrongdoings. It wasn’t long, however, before solitary confinement instead came to be used in prisons as a form of punishment, sometimes lasting for weeks, months, and in some cases, even years. The first research into the effects of solitary confinement dates back to the 1830s, after the practice had been introduced to the Eastern State Penitentiary in Philadelphia. Many visitors reported seeing a high rate of mental breakdown among prisoners in solitary, one of the most famous being Charles Dickens, who toured the facility while visiting the United States. Dickens described solitary confinement as a “slow and daily tampering with the mysteries of the brain,” that was “immeasurably worse than any torture of the body.”