Final answer:
Habituation is a simple form of learning in which an animal stops responding to a stimulus after repeated exposure. In this case, Liane became habituated to the loud street noises at her college residence.
Step-by-step explanation:
Habituation is a simple form of learning in which an animal stops responding to a stimulus after a period of repeated exposure. It is a form of non-associative learning, meaning that the stimulus is not associated with any punishment or reward. In the case of Liane, when she first arrived at her college residence, she couldn't sleep due to the loud street noises. However, over time, she became habituated to the noise and is now used to it.