Final answer:
The situation illustrates the important aspect of perception known as adaptation.
Step-by-step explanation:
This situation illustrates an important aspect of perception known as adaptation. Adaptation refers to our brain's ability to filter out constant or repetitive stimuli, allowing us to focus on new or changing information.
In this scenario, Jason and Mark were engaged in their conversation and didn't realize that the class had been called to order. Their perception of the classroom environment and the ongoing conversations had become their new normal. However, once the teacher stared at them, it signaled a change in the environment, making their conversation disruptive.