The department chair was further amused by the poodle's tendency to be able to discriminate one CS from another (see question 273). He thus told the students to teach the dog to salivate only to the horn on his Ford but not one on a graduate student's Chevrolet truck. In reality, the horns on the two vehicles sounded nearly identical. The training was seemingly unsuccessful inasmuch as the dog merely took to very loud barking. In this case