After school, you watch your friend Katie run to a truck as soon as she hears the truck's music playing. Later, you find out the truck is the ice cream vendor's vehicle. How would a behaviorist interpret Katie's running to the truck? Katie has been conditioned to the music and has associated the musical truck with serving ice cream. Katie uses the music as a test of her biological reflexes. Katie feels empathetic for the man driving the ice cream truck in such hot weather and wants to take him a drink of water. Katie remembers the pattern of the music and knows the truck is too far away to reach unless she runs.