A good friend of yours tells you that he has a new job at a bakery. “Oh man, you are so lucky,” you tell him. “You get to smell that fresh bread and the donuts all day long. I’d LOVE to work there.” Your buddy shakes his head and says, “You know, that’s what I thought, but after I’m there for a few minutes I don’t even smell the baked goods that much anymore.” Because you’ve studied psychology, you know that his loss of responsiveness to the great scents is explained by sensory _______