A 22-year-old patient lies in bed with his head raised high and feels no discomfort in this position. He enters the conversation reluctantly, responds to whispered speech, gives one-word answers. His face is indifferent and hypomimic, the forehead is wrinkled, the lips are puckered. The patient moves very little and often freezes for a long time in an uncomfortable position. This condition has developed gradually over the course of a week with no apparent cause. What condition is observed in the patient?