The two aspects of brainwashing are confession of past crimes or errors, and reeducation to new beliefs. Prisoners are brought to confess by lack of sleep and food and other forms of intense physical discomfort, isolation from familiar surroundings, a prison routine requiring absolute obedience and humility, and social pressure from cell mates. The last includes mutual criticism and self-criticism sessions, which play particularly on the generalized guilt feeling that all people have to some extent. At the same time regular indoctrination sessions are conducted. The acceptance of the new ideas is again fostered by group pressure and the anticipated reward of freedom.