A 32-year-old woman is undergoing elective cesarean section under general anesthesia. After induction with thiopental and intubation, the anesthetist observes that the patient has regular respiration, constricted pupils, and intact corneal reflexes. Blood pressure is 115/72 mmHg and heart rate is 78 bpm. The surgical team requests to begin the procedure. However, the anesthetist notes that the patient's eyelash reflex is still present and there is slight resistance to jaw opening. What stage of anesthesia is the patient currently in?