Disorders of mental activity during catatonia, based on my observations, are very different from what many authors have seen with this disease. At the beginning of my study of catatonia, for a long time I could not understand why what I saw was so different from the descriptions of this disease in textbooks, I did not trust my observations for a long time, explaining this disagreement with the imperfection of research, tried to find what they saw in other observers. But the more I studied these patients, the more I became convinced that the mental disorders of the catatonic patients were still described neurologically. I insist that the catatonic people do not have any delusions or hallucinations; even illusions are extremely rare.