There is always a distinct scent of olive oil and serrano chilies whenever salma enters her aunt's home. she no longer notices the smells after staying a little while inside the house. this scenario is an example of dark adaptation learning by association mimicry habituation

The answer is habituation.

Habituation or in this case, sensory adaptation, it's when the sensitivity to a stimulus decreases as a consequence of constant exposure to the stimulus.
When the stimulus starts, the neurons will begin firing action potentials. After a while in the same environment, you'll most likely have forgotten all about that sensation (in this case noise) even though the stimulus is exactly the same.