Jaiden once loved going to the doctor's office because the doctor would give him a sticker. However, the last three times he has gone, jaiden received painful shots that caused him to cry. Now when the doctor hands him the sticker, he begins to scream. Which of the following is the neutral stimulus?.

Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within an inch of the tailpipe mouth. technician a says that if the paper is vibrating due to a "puffing" output from the tailpipe, this signals a smoothly running engine. technician b says that if the paper is being drawn toward the tailpipe, this could indicate burned exhaust valves. who is correct? a. technician b b. both technicians a and b c. technician a d. neither technicians a or b