and so on. (2)Brain stem:circulatory,respiratory centers (3)Hypothalamus:body temperature;water intake;emotion Seaction6 Advanced Function of Brain 1.Conditioned reflex and unconditioned reflex: Conditioned reflex:A learned reflex in which the nervous system is trained to produce a new and unusual response to a stimulus unconditioned reflex:A fixed reflex whose mechanism may be supposed to be inherited as its functioning does not depend on previous experience 2.Formation of conditioned reflex (1)Conditioned reflex was established on the base of unconditioned reflex (2)conditioned stimulus was respented repetitively with unconditioned stimulus (3)Conditioned stimulus was presented before unconditioned stimulus. (4)The intensity ofconditioned stimulus was lower than unconditioned stimulus. 3.Mechanism of the formation of conditioned reflex A functional pathway is developed during the conditioning period.and so on. (2) Brain stem: circulatory, respiratory centers. (3)Hypothalamus: body temperature;water intake;emotion Seaction6 Advanced Function of Brain 1. Conditioned reflex and unconditioned reflex: Conditioned reflex: A learned reflex in which the nervous system is trained to produce a new and unusual response to a stimulus unconditioned reflex: A fixed reflex whose mechanism may be supposed to be inherited as its functioning does not depend on previous experience 2. Formation of conditioned reflex (1) Conditioned reflex was established on the base of unconditioned reflex. (2)conditioned stimulus was respented repetitively with unconditioned stimulus (3) Conditioned stimulus was presented before unconditioned stimulus. (4)The intensity of conditioned stimulus was lower than unconditioned stimulus. 3. Mechanism of the formation of conditioned reflex A functional pathway is developed during the conditioning period