Final answer:
The villagers in the fable of 'the boy who cried wolf' were exhibiting habituation when they stopped responding to the shepherd boy's false alarms about a wolf.
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. In the fable of 'the boy who cried wolf,' the villagers who stopped listening to the shepherd boy after he repeatedly lied about a wolf attacking the sheep were exhibiting the form of learning called habituation. They had become accustomed to the false alarm and no longer responded to it.