Solitary confinement often [ causes mental illness ]( http://ieet.org/index.php/IEET/more/dvorsky20140725 ) . In addition, it must make dementia more likely, since it has been established that exercising the mind tends to delay dementia.
Ссылка: https://stallman.org/archives/2014-may-aug.html#29_July_2014_%28Solitary_confinement%29