The paper presents analysis of meditation as a form of achievement of altered state of consciousness by concentration of attention and «calming of mind». Buddhist psychopractices and contemporary psychotherapy are compared in the frame of work with imagination. The authors analyze Buddhist Tantric meditation on images of spiritual creatures, which allows the transformation of personal traits in probationer. It is argued that under the conditions of meditation the process of change of categorization takes place, right up to complete stoppage of categorization in nirvana.