absence of natural mood fluctuations; motionless, monotonous, without daily dynamics and not changing from external stimuli. Joyful, exciting, sad or disturbing messages do not find a spiritual response, the mood remains the same. There is no emotional echo when perceiving the emotions of others. Speech is dry, devoid of melody and imagery. Facial expressions are poor, gestures are poor, of the same type, the tone of voice is muffled.