Answer:
"Habituation" is the research method that is being used .
Step-by-step explanation:
Habituation is a type of non-associative learning in which a natural response to a stimulus is reduced after a prolonged or repeated presentation of that stimulus. Habituation occurs within the nervous system in animals. Habituation can involve the intact organism or it can involve only parts of the organism. In the given question above, habituation is used in the research study.